- 11 Dec, 2009 40 commits
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Alan Cox authored
Start trying to untangle the remaining BKL mess Updated to fix missing unlock_kernel noted by Dan Carpenter Signed-off-by:
Alan "I must be out of my tree" Cox <alan@linux.intel.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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Alan Cox authored
moxa_openlock is used for several situations where we want to handle the case of an ioctl that crosses many ports (not just the open tty), and also cases where an open races a deinit (eg a pci unplug) and we hangup a port before we can cope with that. The non open race cases can use the moxa_lock spinlock. This simplifies sorting out the remaining mess. Signed-off-by:
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Alan Cox authored
It isn't needed here any more Signed-off-by:
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Alan Cox authored
This is overkill and mostly not needed Signed-off-by:
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Alan Cox authored
The tty flag can be tested so the shadow flag isn't needed Signed-off-by:
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Alan Cox authored
- The open lock is needed to fix up the case of a board reset occuring during tty open but too early for a sane hangup response. - The lock can however got for other cases - Use the port mutex for get/setserial - Fix up the confused lack of locking on the THROTTLE and other bits in the private flags. Just use set/test/clear bit and it covers the cases we need Signed-off-by:
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Alan Cox authored
Introduce a lock for moxafunc() to protect the cases where were get collisions between two function requests at the same time. Signed-off-by:
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Alan Cox authored
Rework a few bits of this into tty_port format Signed-off-by:
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Alan Cox authored
Alexander Strakh <strakh@ispras.ru> reported KERNEL_VERSION: 2.6.31 DESCRIBE: Driver drivers/char/isicom.c might sleep in atomic context, because it calls tty_port_xmit_buf under spin_lock. ./drivers/char/isicom.c: 1307 static void isicom_hangup(struct tty_struct *tty) 1308 { ... 1315 spin_lock_irqsave(&port->card->card_lock, flags); 1316 isicom_shutdown_port(port); ... Path to might_sleep macro from isicom_hangup: 1. isicom_hangup calls spin_lock_irqsave (drivers/char/isicom.c:1315) and then calls isicom_shutdown_port. 2. isiscom_shutdown_port calls tty_port_free_xmit_buf at drivers/char/isicom.c:906 3. tty_port_free_xmit_buf calls mutex_lock at drivers/char/tty_port:48 Found by Linux Driver Verification Project. Reported-by:Alexander Strakh <strakh@ispras.ru> Signed-off-by:
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Alan Cox authored
Propogate the init/shutdown mutex through the setserial logic. Use the proper locks for the various bits still using the BKL. Kill the BKL in this driver. Updated to fix the bug noted by Dan Carpenter Signed-off-by:
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Alan Cox authored
At first this looks a fairly trivial conversion but we can't quite push everything into the right format yet. The open side is easy but care is needed over the setserial methods. Fix up the locking now that we've adopted the port->mutex locking rule for the initialization. Signed-off-by:
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Alan Cox authored
Split this into two flags - INIT meaning the board is set up and ACTIVE meaning the board has ports open. Remove the broken HUPCL casing and push the counts somewhere sensible. Signed-off-by:
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Alan Cox authored
Trivial conversion in this case so might as well do it while testing the port_open design is right Signed-off-by:
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Alan Cox authored
Users of tty port need a way to refcount ports when hotplugging is involved. Signed-off-by:
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Alan Cox authored
Slice/dice/repeat as with the stallion driver this is just code shuffling and removal Signed-off-by:
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Alan Cox authored
The driver is already structured this way so just slice and dice Signed-off-by:
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Alan Cox authored
Some devices want to set IO_ERROR in their activate methods so that you can be handed a 'dead' port for operations like setserial. Thus we need to clear the flag before activate so that activate can choose to set the flag and still return 0. This is fine as the file handle/tty are not accessible to the user yet. Signed-off-by:
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Alan Cox authored
To propogate tty_port_open/close to a few other devices we need to start handling the IO_ERROR flag on the tty. We can do this pretty trivially. Signed-off-by:
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Alan Cox authored
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Alan Cox authored
We want to be able to do this without regard for the activate/own open method being used which causes a problem using port->mutex. Add another mutex for now. Once everything uses port_open to do buffer allocs we can kill it back off Signed-off-by:
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Alan Cox authored
The new dtr_rts function didn't take the port->func lock as it should so add use of the lock there. Signed-off-by:
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Alan Cox authored
Add the POSIX block for carrier Linux TIOCMIWAIT functionality is still lacking from the driver. Signed-off-by:
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Alan Cox authored
Running the current code through checkpatch shows a few bits of noise mostly but not entirely from before the changes. Signed-off-by:
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Alan Cox authored
Switching between two non standard baud rates fails because of the cflag test. Do as we did elsewhere and just kill the "optimisation". Signed-off-by:
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Alan Cox authored
Gets us proper tty semantics, removes some code and fixes up a few corner case races (hangup during open etc) Signed-off-by:
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Alan Cox authored
When we move to the tty_port logic the port mutex will protect open v close v hangup. Move to this first in the existing open code so we have a bisection point. Signed-off-by:
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Alan Cox authored
The tty can go away underneath us, so we must refcount it. Do the naïve implementation initially. We will worry about startup shortly. Signed-off-by:
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Nicolas Pitre authored
Now... testing reveals that the very first patch "sdio_uart: use tty_port" causes a segmentation fault in sdio_uart_open(): Unable to handle kernel NULL pointer dereference at virtual address 00000084 pgd = dfb44000 [00000084] *pgd=1fb99031, *pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#1] PREEMPT last sysfs file: /sys/devices/platform/mvsdio/mmc_host/mmc0/mmc0:f111/uevent Modules linked in: CPU: 0 Not tainted (2.6.32-rc5-next-20091102-00001-gb36eae9 #10) PC is at sdio_uart_open+0x204/0x2cc [...] Signed-off-by:
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Alan Cox authored
Add a tty_port object to the sdio uart. For the moment just begin using the tty field of the port, as this is the critical one to clean up. Signed-off-by:
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Alan Cox authored
Move the HUCPL handling from the end of close_port_start to the beginning of close_port_end. What this actually does is change the ordering from port shutdown port->dtr_rts to port->dtr_rts port shutdown Some hardware drops the physical connection on shutdown so we must perform the port operations before the shutdown. Signed-off-by:
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Sukadev Bhattiprolu authored
devpts_get_tty() assumes that the inode passed in is associated with a valid pty. But if the only reference to the pty is via a bind-mount, the inode passed to devpts_get_tty() while valid, would refer to a pty that no longer exists. With a lot of debug effort, Grzegorz Nosek developed a small program (see below) to reproduce a crash on recent kernels. This crash is a regression introduced by the commit: commit 527b3e47 Author: Sukadev Bhattiprolu <sukadev@us.ibm.com> Date: Mon Oct 13 10:43:08 2008 +0100 To fix, ensure that the dentry associated with the inode has not yet been deleted/unhashed by devpts_pty_kill(). See also: https://lists.linux-foundation.org/pipermail/containers/2009-July/019273.html tty-bug.c: #define _GNU_SOURCE #include <fcntl.h> #include <sched.h> #include <stdlib.h> #include <sys/mount.h> #include <sys/signal.h> #include <unistd.h> #include <stdio.h> #include <linux/fs.h> void dummy(int sig) { } static int child(void *unused) { int fd; signal(SIGINT, dummy); signal(SIGHUP, dummy); pause(); /* cheesy synchronisation to wait for /dev/pts/0 to appear */ mount("/dev/pts/0", "/dev/console", NULL, MS_BIND, NULL); sleep(2); fd = open("/dev/console", O_RDWR); dup(0); dup(0); write(1, "Hello world!\n", sizeof("Hello world!\n")-1); return 0; } int main(void) { pid_t pid; char *stack; stack = malloc(16384); pid = clone(child, stack+16384, CLONE_NEWNS|SIGCHLD, NULL); open("/dev/ptmx", O_RDWR|O_NOCTTY|O_NONBLOCK); unlockpt(fd); grantpt(fd); sleep(2); kill(pid, SIGHUP); sleep(1); return 0; /* exit before child opens /dev/console */ } Reported-by:
Grzegorz Nosek <root@localdomain.pl> Signed-off-by:
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Tested-by:
Serge Hallyn <serue@us.ibm.com> Cc: stable <stable@kernel.org> Signed-off-by:
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Ian Jackson authored
Do not read IIR in serial8250_start_tx when UART_BUG_TXEN Reading the IIR clears some oustanding interrupts so it is not safe. Instead, simply transmit immediately if the buffer is empty without regard to IIR. Signed-off-by:
Ian Jackson <ian.jackson@eu.citrix.com> Reviewed-by:
Markus Armbruster <armbru@redhat.com> Reviewed-by:
Jiri Kosina <jkosina@suse.cz> Cc: Alan Cox <alan@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by:
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Tilman Schmidt authored
A small addition to the ldisc method descriptions. Signed-off-by:
Tilman Schmidt <tilman@imap.cc> Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Acked-by:
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Uwe Kleine-König authored
Intel(R) PXA27x Processor Family Specification Update (Nov 2005) says: E75. UART: Baud rate may not be programmed correctly on back-to-back writes. Problem: When programming the Divisor Latch registers, Low and High (DLL and DLH), with back-to-back writes, the second register write may not take effect. The result is an incorrect baud rate. Workaround: After programming the first Divisor Latch register, read and verify it before programming the second Divisor Latch register. This was hit when changing the baud rate from 115200 to 9600 while receiving characters at 9600 Bd. And fixed indention of some comments nearby. Signed-off-by:Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by:
Wolfram Sang <w.sang@pengutronix.de> Acked-by:
Marc Kleine-Budde <mkl@pengutronix.de> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Mike Rapoport <mike@compulab.co.il> Signed-off-by:
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André Goddard Rosa authored
Signed-off-by:
André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by:
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André Goddard Rosa authored
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André Goddard Rosa authored
If kzalloc() or alloc_tty_driver() fails, we call: put_tty_driver(normal = NULL). Then: put_tty_driver -> tty_driver_kref_put -> kref_put(&NULL->kref, ...) Signed-off-by: -
Alan Cox authored
Opticon now takes the right mutex to check the port status but the status check is done wrongly for the modern serial code, so fix it. Signed-off-by:
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Alan Cox authored
The tty port has a port mutex used for all the port related locking so we don't need the one in the USB serial layer any more. Signed-off-by:
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Alan Cox authored
As Alan Stern pointed out - now we have tty_port_open the shutdown method and locking allow us to whack the other bits into the full helper methods and provide a shutdown op which the tty port code will synchronize with setup for us. Signed-off-by:
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