- 03 Oct, 2008 2 commits
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Russell King authored
Merge branch 'omap-rmk' into omap-all
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Russell King authored
Merge branch 'omap2-clock' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git Merge branch 'omap2-clock' into omap-all
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- 05 Sep, 2008 12 commits
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Russell King authored
Signed-off-by:Russell King <rmk+kernel@arm.linux.org.uk>
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Russell King authored
Signed-off-by: -
Russell King authored
gpio.c wilfully casts physical addresses to void __iomem * and then fixes them up at runtime using: bank->base = IO_ADDRESS(bank->base); where accesses prior to this fixup are via omap_read/omap_write, and after are by __raw_read/__raw_write. This doesn't lend itself to static checking, nor to easy understanding of the code. And so, OMAP_MPUIO_BASE gets to be the right type - integer like since it's a physical address, not a MMIO pointer. Signed-off-by: -
Russell King authored
We're now assigning/comparing void __iomem pointers with void __iomem pointer variables. Signed-off-by: -
Russell King authored
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Russell King authored
OMAP1_IO_ADDRESS(), OMAP2_IO_ADDRESS() and IO_ADDRESS() returns cookies for use with __raw_{read|write}* for accessing registers. Therefore, these macros should return (void __iomem *) cookies, not integer values. Doing this improves typechecking, and means we can find those places where, eg, DMA controllers are incorrectly given virtual addresses to DMA to, or physical addresses are thrown through a virtual to physical address translation. Signed-off-by: -
Russell King authored
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Russell King authored
Signed-off-by: -
Russell King authored
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Russell King authored
When omap_udc is also incorporated, this macro will no longer be used. Signed-off-by: -
Russell King authored
A function to contain common code for the size of the resource we need to allocate or free. OMAP ports need 22 bytes rather than the standard 8 bytes. Signed-off-by: -
Russell King authored
Make is_omap_port() take the uart_8250_port structure so it can do whatever test it desires. Convert the test to compare the physical addresses rather than virtual addresses. Signed-off-by:
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- 04 Sep, 2008 3 commits
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Russell King authored
mcbsp is confused as to what takes a physical or virtual address. Fix the two instances where it gets it wrong. Acked-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Huang Weiyi authored
The driver(s) below do not use LINUX_VERSION_CODE nor KERNEL_VERSION. arch/arm/plat-mxc/clock.c This patch removes the said #include <version.h>. Signed-off-by:
Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by:
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Russell King authored
drivers/usb/host/ohci-omap.c: In function 'ohci_omap_init': drivers/usb/host/ohci-omap.c:228: error: 'start_hnp' undeclared (first use in this function) Signed-off-by:
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- 03 Sep, 2008 23 commits
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Russell King authored
arch/arm/plat-omap/gpio.c: In function '_omap_gpio_init': arch/arm/plat-omap/gpio.c:1492: error: 'omap_mpuio_device' undeclared (first use in this function) Signed-off-by: -
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6Linus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: ipsec: Fix deadlock in xfrm_state management. ipv: Re-enable IP when MTU > 68 net/xfrm: Use an IS_ERR test rather than a NULL test ath9: Fix ath_rx_flush_tid() for IRQs disabled kernel warning message. ath9k: Incorrect key used when group and pairwise ciphers are different. rt2x00: Compiler warning unmasked by fix of BUILD_BUG_ON mac80211: Fix debugfs union misuse and pointer corruption wireless/libertas/if_cs.c: fix memory leaks orinoco: Multicast to the specified addresses iwlwifi: fix 64bit platform firmware loading iwlwifi: fix apm_stop (wrong bit polarity for FLAG_INIT_DONE) iwlwifi: workaround interrupt handling no some platforms iwlwifi: do not use GFP_DMA in iwl_tx_queue_init net/wireless/Kconfig: clarify the description for CONFIG_WIRELESS_EXT_SYSFS net: Unbreak userspace usage of linux/mroute.h pkt_sched: Fix locking of qdisc_root with qdisc_root_sleeping_lock() ipv6: When we droped a packet, we should return NET_RX_DROP instead of 0
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Thomas Gleixner authored
Larry Finger reported at http://lkml.org/lkml/2008/9/1/90: An ancient laptop of mine started throwing errors from b43legacy when I started using 2.6.27 on it. This has been bisected to commit bfc0f594 "x86: merge tsc calibration". The unification of the TSC code adopted mostly the 64bit code, which prefers PMTIMER/HPET over the PIT calibration. Larrys system has an AMD K6 CPU. Such systems are known to have PMTIMER incarnations which run at double speed. This results in a miscalibration of the TSC by factor 0.5. So the resulting calibrated CPU/TSC speed is half of the real CPU speed, which means that the TSC based delay loop will run half the time it should run. That might explain why the b43legacy driver went berserk. On the other hand we know about systems, where the PIT based calibration results in random crap due to heavy SMI/SMM disturbance. On those systems the PMTIMER/HPET based calibration logic with SMI detection shows better results. According to Alok also virtualized systems suffer from the PIT calibration method. The solution is to use a more wreckage aware aproach than the current either/or decision. 1) reimplement the retry loop which was dropped from the 32bit code during the merge. It repeats the calibration and selects the lowest frequency value as this is probably the closest estimate to the real frequency 2) Monitor the delta of the TSC values in the delay loop which waits for the PIT counter to reach zero. If the maximum value is significantly different from the minimum, then we have a pretty safe indicator that the loop was disturbed by an SMI. 3) keep the pmtimer/hpet reference as a backup solution for systems where the SMI disturbance is a permanent point of failure for PIT based calibration 4) do the loop iteration for both methods, record the lowest value and decide after all iterations finished. 5) Set a clear preference to PIT based calibration when the result makes sense. The implementation does the reference calibration based on HPET/PMTIMER around the delay, which is necessary for the PIT anyway, but keeps separate TSC values to ensure the "independency" of the resulting calibration values. Tested on various 32bit/64bit machines including Geode 266Mhz, AMD K6 (affected machine with a double speed pmtimer which I grabbed out of the dump), Pentium class machines and AMD/Intel 64 bit boxen. Bisected-by:
Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Tested-by:
Linus Torvalds <torvalds@linux-foundation.org>
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David S. Miller authored
Ever since commit 4c563f76 ("[XFRM]: Speed up xfrm_policy and xfrm_state walking") it is illegal to call __xfrm_state_destroy (and thus xfrm_state_put()) with xfrm_state_lock held. If we do, we'll deadlock since we have the lock already and __xfrm_state_destroy() tries to take it again. Fix this by pushing the xfrm_state_put() calls after the lock is dropped. Signed-off-by:
David S. Miller <davem@davemloft.net>
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Andrew Morton authored
Fix a bug reported by and diagnosed by Aaron Straus. This is a regression intruduced into 2.6.26 by commit adc782da Author: Matt Mackall <mpm@selenic.com> Date: Tue Apr 29 01:03:07 2008 -0700 random: simplify and rename credit_entropy_store credit_entropy_bits() does: spin_lock_irqsave(&r->lock, flags); ... if (r->entropy_count > r->poolinfo->POOLBITS) r->entropy_count = r->poolinfo->POOLBITS; so there is a time window in which this BUG_ON(): static size_t account(struct entropy_store *r, size_t nbytes, int min, int reserved) { unsigned long flags; BUG_ON(r->entropy_count > r->poolinfo->POOLBITS); /* Hold lock while accounting */ spin_lock_irqsave(&r->lock, flags); can trigger. We could fix this by moving the assertion inside the lock, but it seems safer and saner to revert to the old behaviour wherein entropy_store.entropy_count at no time exceeds entropy_store.poolinfo->POOLBITS. Reported-by:Aaron Straus <aaron@merfinllc.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: <stable@kernel.org> [2.6.26.x] Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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John Kacur authored
Make PM_QOS and CPU_IDLE play nicer when run with the RT-Preempt kernel. The purpose of the patch is to remove the spin_lock around the read in the function pm_qos_requirement - since spinlocks can sleep in -rt and this function is called from idle. CPU_IDLE polls the target_value's of some of the pm_qos parameters from the idle loop causing sleeping locking warnings. Changing the target_value to an atomic avoids this issue. Remove the spinlock in pm_qos_requirement by making target_value an atomic type. Signed-off-by:
mark gross <mgross@linux.intel.com> Signed-off-by:
John Kacur <jkacur@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
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Rafael J. Wysocki authored
Update rtc-cmos shutdown handling to leave RTC alarms active, resolving http://bugzilla.kernel.org/show_bug.cgi?id=11411 on several boards. There are still some systems where the ACPI event handling doesn't cooperate. (Possibly related to bugid 11312, reporting the spontaneous disabling of RTC events.) Bug 11411 reported that changes to work around some ACPI event issues broke wake-from-S5 handling, as used for DVR applications. (They like to power off, then wake later to record programs.) [yakui.zhao@intel.com: add shutdown for PNP devices] [dbrownell@users.sourceforge.net: update comments] Signed-off-by:
Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by:
Zhao Yakui <yakui.zhao@intel.com> Signed-off-by:
Zhang Rui <rui.zhang@intel.com> Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Cc: Stefan Bauer <stefan.bauer@cs.tu-chemnitz.de> Signed-off-by:
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Russ Anderson authored
Document files in /sys/firmware/sgi_uv/. Signed-off-by:
Russ Anderson <rja@sgi.com> Cc: Jack Steiner <steiner@sgi.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by:
Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:
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Mike Christie authored
I got this patch through Red Hat's bugzilla from the bug submitter and patch creator. I have just fixed it up so it applies without fuzz to upstream kernels. Original patch and description from Shyam kumar Iyer: The issue [ibft module not displaying targets with short names] is because of an offset calculatation error in the iscsi_ibft.c code. Due to this error directory structure for the target in /sys/firmware/ibft does not get created and so the initiator is unable to connect to the target. Note that this bug surfaced only with an name that had a short section at the end. eg: "iqn.1984-05.com.dell:dell". It did not surface when the iqn's had a longer section at the end. eg: "iqn.2001-04.com.example:storage.disk2.sys1.xyz" So, the eot_offset was calculated such that an extra 48 bytes i.e. the size of the ibft_header which has already been accounted was subtracted twice. This was not evident with longer iqn names because they would overshoot the total ibft length more than 48 bytes and thus would escape the bug. Signed-off-by:
Shyam Kumar Iyer <shyam_iyer@dell.com> Signed-off-by:
Mike Christie <michaelc@cs.wisc.edu> Cc: Konrad Rzeszutek <konrad@virtualiron.com> Cc: Peter Jones <pjones@redhat.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:
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Jan Altenberg authored
commit 945185a6 ("rtc: rtc_time_to_tm: use unsigned arithmetic") changed the some types in rtc_time_to_tm() to unsigned: void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) { - register int days, month, year; + unsigned int days, month, year; This doesn't work for all cases, because days is checked for < 0 later on: if (days < 0) { year -= 1; days += 365 + LEAP_YEAR(year); } I think the correct fix would be to keep days signed and do an appropriate cast later on. Signed-off-by:
Jan Altenberg <jan.altenberg@linutronix.de> Cc: Maciej W. Rozycki <macro@linux-mips.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Cc: Dmitri Vorobiev <dmitri.vorobiev@gmail.com> Cc: <stable@kernel.org> Signed-off-by:
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Krzysztof Helt authored
If there are more then one graphics card handled by the tdfxfb driver the name of the frame buffer overruns reserved size. Signed-off-by:
Krzysztof Helt <krzysztof.h1@wp.pl> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Krzysztof Helt authored
Fix memory detection on Voodoo3 cards with SDRAM memory. Signed-off-by:
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Matthew Garrett authored
It turns out that event 0x4 merely indcates that a hotkey has been pressed, not which one. A further query is required in order to determine the actual keypress. The following patch adds support for that along with the known keycodes. Signed-off-by:
Matthew Garrett <mjg@redhat.com> Signed-off-by:
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Matthew Garrett authored
hp-wmi currently changes the RFKill state by altering the struct members rather than using the dedicated interface, meaning that update events won't be pushed to userspace. This patch fixes that, along with fixing the declared type of the WWAN kill switch. It also ensures that rfkill interfaces are only registered for hardware that exists. Signed-off-by:
Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Ivo van Doorn <ivdoorn@gmail.com> Cc: Dave Young <hidave.darkstar@gmail.com> Cc: Marcel Holtmann <marcel@holtmann.org> Signed-off-by:
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Nadia Derbey authored
Update Documentation/filesystems/proc.txt: it describes the file auto_msgmni intoduced to enable/disable msgmni automatic recomputing upon memory add/remove (see thread http://lkml.org/lkml/2008/7/4/27). Also added a description for msgmni (this filex is only listed in Documentation/sysctl/kernel.txt). Signed-off-by:
Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by:
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KOSAKI Motohiro authored
Quicklists store pages for each CPU as caches. (Each CPU can cache node_free_pages/16 pages) It is used for page table cache. exit() will increase the cache size, while fork() consumes it. So for example if an apache-style application runs (one parent and many child model), one CPU process will fork() while another CPU will process the middleware work and exit(). At that time, the CPU on which the parent runs doesn't have page table cache at all. Others (on which children runs) have maximum caches. QList_max = (#ofCPUs - 1) x Free / 16 => QList_max / (Free + QList_max) = (#ofCPUs - 1) / (16 + #ofCPUs - 1) So, How much quicklist memory is used in the maximum case? This is proposional to # of CPUs because the limit of per cpu quicklist cache doesn't see the number of cpus. Above calculation mean Number of CPUs per node 2 4 8 16 ============================== ==================== QList_max / (Free + QList_max) 5.8% 16% 30% 48% Wow! Quicklist can spend about 50% memory at worst case. My demonstration program is here -------------------------------------------------------------------------------- #define _GNU_SOURCE #include <stdio.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <sched.h> #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> #define BUFFSIZE 512 int max_cpu(void) /* get max number of logical cpus from /proc/cpuinfo */ { FILE *fd; char *ret, buffer[BUFFSIZE]; int cpu = 1; fd = fopen("/proc/cpuinfo", "r"); if (fd == NULL) { perror("fopen(/proc/cpuinfo)"); exit(EXIT_FAILURE); } while (1) { ret = fgets(buffer, BUFFSIZE, fd); if (ret == NULL) break; if (!strncmp(buffer, "processor", 9)) cpu = atoi(strchr(buffer, ':') + 2); } fclose(fd); return cpu; } void cpu_bind(int cpu) /* bind current process to one cpu */ { cpu_set_t mask; int ret; CPU_ZERO(&mask); CPU_SET(cpu, &mask); ret = sched_setaffinity(0, sizeof(mask), &mask); if (ret == -1) { perror("sched_setaffinity()"); exit(EXIT_FAILURE); } sched_yield(); /* not necessary */ } #define MMAP_SIZE (10 * 1024 * 1024) /* 10 MB */ #define FORK_INTERVAL 1 /* 1 second */ main(int argc, char *argv[]) { int cpu_max, nextcpu; long pagesize; pid_t pid; /* set max number of logical cpu */ if (argc > 1) cpu_max = atoi(argv[1]) - 1; else cpu_max = max_cpu(); /* get the page size */ pagesize = sysconf(_SC_PAGESIZE); if (pagesize == -1) { perror("sysconf(_SC_PAGESIZE)"); exit(EXIT_FAILURE); } /* prepare parent process */ cpu_bind(0); nextcpu = cpu_max; loop: /* select destination cpu for child process by round-robin rule */ if (++nextcpu > cpu_max) nextcpu = 1; pid = fork(); if (pid == 0) { /* child action */ char *p; int i; /* consume page tables */ p = mmap(0, MMAP_SIZE, PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); i = MMAP_SIZE / pagesize; while (i-- > 0) { *p = 1; p += pagesize; } /* move to other cpu */ cpu_bind(nextcpu); /* printf("a child moved to cpu%d after mmap().\n", nextcpu); fflush(stdout); */ /* back page tables to pgtable_quicklist */ exit(0); } else if (pid > 0) { /* parent action */ sleep(FORK_INTERVAL); waitpid(pid, NULL, WNOHANG); } goto loop; } ---------------------------------------- When above program which does task migration runs, my 8GB box spends 800MB of memory for quicklist. This is not memory leak but doesn't seem good. % cat /proc/meminfo MemTotal: 7701568 kB MemFree: 4724672 kB (snip) Quicklists: 844800 kB because - My machine spec is number of numa node: 2 number of cpus: 8 (4CPU x2 node) total mem: 8GB (4GB x2 node) free mem: about 5GB - Then, 4.7GB x 16% ~= 880MB. So, Quicklist can use 800MB. So, if following spec machine run that program CPUs: 64 (8cpu x 8node) Mem: 1TB (128GB x8node) Then, quicklist can waste 300GB (= 1TB x 30%). It is too large. So, I don't like cache policies which is proportional to # of cpus. My patch changes the number of caches from: per-cpu-cache-amount = memory_on_node / 16 to per-cpu-cache-amount = memory_on_node / 16 / number_of_cpus_on_node. Signed-off-by:KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Keiichiro Tokunaga <tokunaga.keiich@jp.fujitsu.com> Acked-by:
Christoph Lameter <cl@linux-foundation.org> Tested-by:
Mike Travis <travis@sgi.com> Signed-off-by:
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KOSAKI Motohiro authored
Quicklists can consume several GB of memory. We should provide a means of monitoring this. After this patch is applied, /proc/meminfo will output the following: % cat /proc/meminfo MemTotal: 7715392 kB MemFree: 5401600 kB Buffers: 80384 kB Cached: 300800 kB SwapCached: 0 kB Active: 235584 kB Inactive: 262656 kB SwapTotal: 2031488 kB SwapFree: 2031488 kB Dirty: 3520 kB Writeback: 0 kB AnonPages: 117696 kB Mapped: 38528 kB Slab: 1589952 kB SReclaimable: 23104 kB SUnreclaim: 1566848 kB PageTables: 14656 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 5889152 kB Committed_AS: 393152 kB VmallocTotal: 17592177655808 kB VmallocUsed: 29056 kB VmallocChunk: 17592177626432 kB Quicklists: 130944 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 262144 kB Signed-off-by:
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Li Zefan authored
During the use of a dev_cgroup, we should guarantee the corresponding cgroup won't be deleted (i.e. via rmdir). This can be done through css_get(&dev_cgroup->css), but here we can just get and use the dev_cgroup under rcu_read_lock. And also remove checking NULL dev_cgroup, it won't be NULL since a task always belongs to a cgroup. Signed-off-by:
Li Zefan <lizf@cn.fujitsu.com> Acked-by:
Serge Hallyn <serue@us.ibm.com> Cc: Paul Menage <menage@google.com> Signed-off-by:
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Krzysztof Helt authored
1. Check if virtual resolution fits into memory. Otherwise, Linux hangs during panning. 2. When selected use all available memory to maximize yres_virtual to speed up panning (previously also xres_virtual was increased). 3. Simplify memory restriction calculations. Signed-off-by:Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by:
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Oleg Nesterov authored
We don't change pid_ns->child_reaper when the main thread of the subnamespace init exits. As Robert Rex <robert.rex@exasol.com> pointed out this is wrong. Yes, the re-parenting itself works correctly, but if the reparented task exits it needs ->parent->nsproxy->pid_ns in do_notify_parent(), and if the main thread is zombie its ->nsproxy was already cleared by exit_task_namespaces(). Introduce the new function, find_new_reaper(), which finds the new ->parent for the re-parenting and changes ->child_reaper if needed. Kill the now unneeded exit_child_reaper(). Also move the changing of ->child_reaper from zap_pid_ns_processes() to find_new_reaper(), this consolidates the games with ->child_reaper and makes it stable under tasklist_lock. Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11391Reported-by:
Robert Rex <robert.rex@exasol.com> Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Acked-by:
Pavel Emelyanov <xemul@openvz.org> Acked-by:
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by:
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Oleg Nesterov authored
zap_pid_ns_processes() sets pid_ns->child_reaper = NULL, this is wrong. Yes, we have already killed all tasks in this namespace, and sys_wait4() doesn't see any child. But this doesn't mean ->children list is empty, we may have EXIT_DEAD tasks which are not visible to do_wait(). In that case the subsequent forget_original_parent() will crash the kernel because it will try to re-parent these tasks to the NULL reaper. Even if there are no childs, it is not good that forget_original_parent() uses reaper == NULL. Change the code to set ->child_reaper = init_pid_ns.child_reaper instead. We could use pid_ns->parent->child_reaper as well, I think this does not really matter. These EXIT_DEAD tasks are not visible to the new ->parent after re-parenting, they will silently do release_task() eventually. Note that we must change ->child_reaper, otherwise forget_original_parent() will use reaper == father, and in that case we will hit the (correct) BUG_ON(!list_empty(&father->children)). Signed-off-by:
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David Brownell authored
At91_mci is abusing dma_free_coherent(), which may not be called with IRQs disabled. I saw "mkfs.ext3" on an MMC card objecting voluminously as each write completed: WARNING: at arch/arm/mm/consistent.c:368 dma_free_coherent+0x2c/0x224() [<c002726c>] (dump_stack+0x0/0x14) from [<c00387d4>] (warn_on_slowpath+0x4c/0x68) [<c0038788>] (warn_on_slowpath+0x0/0x68) from [<c0028768>] (dma_free_coherent+0x2c/0x224) r6:00008008 r5:ffc06000 r4:00000000 [<c002873c>] (dma_free_coherent+0x0/0x224) from [<c01918ac>] (at91_mci_irq+0x374/0x420) [<c0191538>] (at91_mci_irq+0x0/0x420) from [<c0065d9c>] (handle_IRQ_event+0x2c/0x6c) ... This bug has been around for a LONG time. The MM warning is from late 2005, but the driver merged a year later ... so I'm puzzled why nobody noticed this before now. The fix involves noting that this buffer shouldn't be DMA-coherent; it's just used for normal DMA writes. So replace it with standard kmalloc() buffering and DMA mapping calls. This is the quickie fix. A better one would not rely on allocating large bounce buffers. (Note that dma_alloc_coherent could have failed too, but that case was ignored... kmalloc is a bit more likely to fail though.) Signed-off-by:
Pierre Ossman <drzeus-mmc@drzeus.cx> Cc: Andrew Victor <linux@maxim.org.za> Acked-by:
Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Will Newton authored
Recent changes to tighten the check for UARTs that don't correctly re-assert THRE (01c194d9: "serial 8250: tighten test for using backup timer") caused problems when such a UART was opened for the second time - the bug could only successfully be detected at first initialization. For users of this version of this particular UART IP it is fatal. This patch stores the information about the bug in the bugs field of the port structure when the port is first started up so subsequent opens can check this bit even if the test for the bug fails. David Brownell: "My own exposure to this is that the UART on DaVinci hardware, which TI allegedly derived from its original 16550 logic, has periodically gone from working to unusable with the mainline 8250.c ... and back and forth a bunch. Currently it's "unusable", a regression from some previous versions. With this patch from Will, it's usable." Signed-off-by:
Will Newton <will.newton@gmail.com> Acked-by:
Alex Williamson <alex.williamson@hp.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: David Brownell <david-b@pacbell.net> Cc: <stable@kernel.org> [2.6.26.x] Signed-off-by:
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