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Commit d13549f8 authored by Jiri Slaby's avatar Jiri Slaby Committed by Live-CD User
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cyclades: add tty refcounting 

While this is not problem for Y card handlers (they are protected
by card_lock), Z handlers and other functions may dereference NULL
at any point after hangup/close. Even if (tty == NULL) was already
performed in the handler.

Note that it's not an issue for Y cards just for now. After
switching to tty_port_close_* et al. this will be a problem. So
add refcounting to them all.

Also proc .show doesn't take a tty reference and it should (along
with a ldisc one).

While at it and changing prototypes (adding tty param), prepend
cy_ to functions which don't have it yet.
Signed-off-by: default avatarJiri Slaby <jirislaby@gmail.com>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1607acae
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Showing with 93 additions and 79 deletions
drivers/char/cyclades.c
View file @ d13549f8
......@@ -850,7 +850,7 @@ MODULE_DEVICE_TABLE(pci, cy_pci_dev_id);
#endif
static void cy_start(struct tty_struct *);
static void set_line_char(struct cyclades_port *);
static void cy_set_line_char(struct cyclades_port *, struct tty_struct *);
static int cyz_issue_cmd(struct cyclades_card *, __u32, __u8, __u32);
#ifdef CONFIG_ISA
static unsigned detect_isa_irq(void __iomem *);
......@@ -1011,8 +1011,9 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
save_car = readb(base_addr + (CyCAR << index));
cy_writeb(base_addr + (CyCAR << index), save_xir);
tty = tty_port_tty_get(&info->port);
/* if there is nowhere to put the data, discard it */
if (info->port.tty == NULL) {
if (tty == NULL) {
if ((readb(base_addr + (CyRIVR << index)) & CyIVRMask) ==
CyIVRRxEx) { /* exception */
data = readb(base_addr + (CyRDSR << index));
......@@ -1024,7 +1025,6 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
goto end;
}
/* there is an open port for this data */
tty = info->port.tty;
if ((readb(base_addr + (CyRIVR << index)) & CyIVRMask) ==
CyIVRRxEx) { /* exception */
data = readb(base_addr + (CyRDSR << index));
......@@ -1041,6 +1041,7 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
if (data & info->ignore_status_mask) {
info->icount.rx++;
tty_kref_put(tty);
return;
}
if (tty_buffer_request_room(tty, 1)) {
......@@ -1121,6 +1122,7 @@ static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
info->idle_stats.recv_idle = jiffies;
}
tty_schedule_flip(tty);
tty_kref_put(tty);
end:
/* end of service */
cy_writeb(base_addr + (CyRIR << index), save_xir & 0x3f);
......@@ -1131,6 +1133,7 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
void __iomem *base_addr)
{
struct cyclades_port *info;
struct tty_struct *tty;
int char_count, index = cinfo->bus_index;
u8 save_xir, channel, save_car, outch;
......@@ -1154,7 +1157,8 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
goto end;
}
info = &cinfo->ports[channel + chip * 4];
if (info->port.tty == NULL) {
tty = tty_port_tty_get(&info->port);
if (tty == NULL) {
cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) & ~CyTxRdy);
goto end;
......@@ -1205,7 +1209,7 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
~CyTxRdy);
goto done;
}
if (info->port.tty->stopped || info->port.tty->hw_stopped) {
if (tty->stopped || tty->hw_stopped) {
cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) &
~CyTxRdy);
......@@ -1241,7 +1245,8 @@ static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
}
done:
tty_wakeup(info->port.tty);
tty_wakeup(tty);
tty_kref_put(tty);
end:
/* end of service */
cy_writeb(base_addr + (CyTIR << index), save_xir & 0x3f);
......@@ -1252,6 +1257,7 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
void __iomem *base_addr)
{
struct cyclades_port *info;
struct tty_struct *tty;
int index = cinfo->bus_index;
u8 save_xir, channel, save_car, mdm_change, mdm_status;
......@@ -1265,7 +1271,8 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
mdm_change = readb(base_addr + (CyMISR << index));
mdm_status = readb(base_addr + (CyMSVR1 << index));
if (!info->port.tty)
tty = tty_port_tty_get(&info->port);
if (!tty)
goto end;
if (mdm_change & CyANY_DELTA) {
......@@ -1284,27 +1291,27 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
if ((mdm_change & CyDCD) && (info->port.flags & ASYNC_CHECK_CD)) {
if (!(mdm_status & CyDCD)) {
tty_hangup(info->port.tty);
tty_hangup(tty);
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
}
wake_up_interruptible(&info->port.open_wait);
}
if ((mdm_change & CyCTS) && (info->port.flags & ASYNC_CTS_FLOW)) {
if (info->port.tty->hw_stopped) {
if (tty->hw_stopped) {
if (mdm_status & CyCTS) {
/* cy_start isn't used
because... !!! */
info->port.tty->hw_stopped = 0;
tty->hw_stopped = 0;
cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) |
CyTxRdy);
tty_wakeup(info->port.tty);
tty_wakeup(tty);
}
} else {
if (!(mdm_status & CyCTS)) {
/* cy_stop isn't used
because ... !!! */
info->port.tty->hw_stopped = 1;
tty->hw_stopped = 1;
cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) &
~CyTxRdy);
......@@ -1315,6 +1322,7 @@ static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
}
if (mdm_change & CyRI) {
}*/
tty_kref_put(tty);
end:
/* end of service */
cy_writeb(base_addr + (CyMIR << index), save_xir & 0x3f);
......@@ -1449,11 +1457,10 @@ cyz_issue_cmd(struct cyclades_card *cinfo,
return 0;
} /* cyz_issue_cmd */
static void cyz_handle_rx(struct cyclades_port *info,
static void cyz_handle_rx(struct cyclades_port *info, struct tty_struct *tty,
struct BUF_CTRL __iomem *buf_ctrl)
{
struct cyclades_card *cinfo = info->card;
struct tty_struct *tty = info->port.tty;
unsigned int char_count;
int len;
#ifdef BLOCKMOVE
......@@ -1542,11 +1549,10 @@ static void cyz_handle_rx(struct cyclades_port *info,
}
}
static void cyz_handle_tx(struct cyclades_port *info,
static void cyz_handle_tx(struct cyclades_port *info, struct tty_struct *tty,
struct BUF_CTRL __iomem *buf_ctrl)
{
struct cyclades_card *cinfo = info->card;
struct tty_struct *tty = info->port.tty;
u8 data;
unsigned int char_count;
#ifdef BLOCKMOVE
......@@ -1642,7 +1648,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
special_count = 0;
delta_count = 0;
info = &cinfo->ports[channel];
tty = info->port.tty;
tty = tty_port_tty_get(&info->port);
if (tty == NULL)
continue;
......@@ -1674,7 +1680,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
C_RS_DCD) {
wake_up_interruptible(&info->port.open_wait);
} else {
tty_hangup(info->port.tty);
tty_hangup(tty);
wake_up_interruptible(&info->port.open_wait);
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
}
......@@ -1706,7 +1712,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
printk(KERN_DEBUG "cyz_interrupt: rcvd intr, card %d, "
"port %ld\n", info->card, channel);
#endif
cyz_handle_rx(info, buf_ctrl);
cyz_handle_rx(info, tty, buf_ctrl);
break;
case C_CM_TXBEMPTY:
case C_CM_TXLOWWM:
......@@ -1716,7 +1722,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
printk(KERN_DEBUG "cyz_interrupt: xmit intr, card %d, "
"port %ld\n", info->card, channel);
#endif
cyz_handle_tx(info, buf_ctrl);
cyz_handle_tx(info, tty, buf_ctrl);
break;
#endif /* CONFIG_CYZ_INTR */
case C_CM_FATAL:
......@@ -1729,6 +1735,7 @@ static void cyz_handle_cmd(struct cyclades_card *cinfo)
wake_up_interruptible(&info->delta_msr_wait);
if (special_count)
tty_schedule_flip(tty);
tty_kref_put(tty);
}
}
......@@ -1774,7 +1781,6 @@ static void cyz_poll(unsigned long arg)
{
struct cyclades_card *cinfo;
struct cyclades_port *info;
struct tty_struct *tty;
struct FIRM_ID __iomem *firm_id;
struct ZFW_CTRL __iomem *zfw_ctrl;
struct BUF_CTRL __iomem *buf_ctrl;
......@@ -1802,13 +1808,19 @@ static void cyz_poll(unsigned long arg)
cyz_handle_cmd(cinfo);
for (port = 0; port < cinfo->nports; port++) {
struct tty_struct *tty;
info = &cinfo->ports[port];
tty = info->port.tty;
buf_ctrl = &(zfw_ctrl->buf_ctrl[port]);
tty = tty_port_tty_get(&info->port);
/* OK to pass NULL to the handle functions below.
They need to drop the data in that case. */
if (!info->throttle)
cyz_handle_rx(info, buf_ctrl);
cyz_handle_tx(info, buf_ctrl);
cyz_handle_rx(info, tty, buf_ctrl);
cyz_handle_tx(info, tty, buf_ctrl);
tty_kref_put(tty);
}
/* poll every 'cyz_polling_cycle' period */
expires = jiffies + cyz_polling_cycle;
......@@ -1824,7 +1836,7 @@ static void cyz_poll(unsigned long arg)
/* This is called whenever a port becomes active;
interrupts are enabled and DTR & RTS are turned on.
*/
static int startup(struct cyclades_port *info)
static int cy_startup(struct cyclades_port *info, struct tty_struct *tty)
{
struct cyclades_card *card;
unsigned long flags;
......@@ -1848,8 +1860,7 @@ static int startup(struct cyclades_port *info)
}
if (!info->type) {
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
set_bit(TTY_IO_ERROR, &tty->flags);
free_page(page);
goto errout;
}
......@@ -1861,7 +1872,7 @@ static int startup(struct cyclades_port *info)
spin_unlock_irqrestore(&card->card_lock, flags);
set_line_char(info);
cy_set_line_char(info, tty);
if (!cy_is_Z(card)) {
chip = channel >> 2;
......@@ -1900,8 +1911,7 @@ static int startup(struct cyclades_port *info)
readb(base_addr + (CySRER << index)) | CyRxData);
info->port.flags |= ASYNC_INITIALIZED;
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
clear_bit(TTY_IO_ERROR, &tty->flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
info->breakon = info->breakoff = 0;
memset((char *)&info->idle_stats, 0, sizeof(info->idle_stats));
......@@ -1984,8 +1994,7 @@ static int startup(struct cyclades_port *info)
/* enable send, recv, modem !!! */
info->port.flags |= ASYNC_INITIALIZED;
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
clear_bit(TTY_IO_ERROR, &tty->flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
info->breakon = info->breakoff = 0;
memset((char *)&info->idle_stats, 0, sizeof(info->idle_stats));
......@@ -2047,7 +2056,7 @@ static void start_xmit(struct cyclades_port *info)
* This routine shuts down a serial port; interrupts are disabled,
* and DTR is dropped if the hangup on close termio flag is on.
*/
static void shutdown(struct cyclades_port *info)
static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
{
struct cyclades_card *card;
unsigned long flags;
......@@ -2083,7 +2092,7 @@ static void shutdown(struct cyclades_port *info)
free_page((unsigned long)temp);
}
cy_writeb(base_addr + (CyCAR << index), (u_char) channel);
if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
if (tty->termios->c_cflag & HUPCL) {
cy_writeb(base_addr + (CyMSVR1 << index), ~CyRTS);
cy_writeb(base_addr + (CyMSVR2 << index), ~CyDTR);
#ifdef CY_DEBUG_DTR
......@@ -2097,8 +2106,7 @@ static void shutdown(struct cyclades_port *info)
/* it may be appropriate to clear _XMIT at
some later date (after testing)!!! */
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
set_bit(TTY_IO_ERROR, &tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
......@@ -2132,7 +2140,7 @@ static void shutdown(struct cyclades_port *info)
free_page((unsigned long)temp);
}
if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
if (tty->termios->c_cflag & HUPCL) {
cy_writel(&ch_ctrl[channel].rs_control,
(__u32)(readl(&ch_ctrl[channel].rs_control) &
~(C_RS_RTS | C_RS_DTR)));
......@@ -2147,8 +2155,7 @@ static void shutdown(struct cyclades_port *info)
#endif
}
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
set_bit(TTY_IO_ERROR, &tty->flags);
info->port.flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&card->card_lock, flags);
......@@ -2436,7 +2443,6 @@ static int cy_open(struct tty_struct *tty, struct file *filp)
printk(KERN_DEBUG "cyc:cy_open ttyC%d\n", info->line);
#endif
tty->driver_data = info;
info->port.tty = tty;
if (serial_paranoia_check(info, tty->name, "cy_open"))
return -ENODEV;
......@@ -2462,7 +2468,7 @@ static int cy_open(struct tty_struct *tty, struct file *filp)
/*
* Start up serial port
*/
retval = startup(info);
retval = cy_startup(info, tty);
if (retval)
return retval;
......@@ -2476,6 +2482,7 @@ static int cy_open(struct tty_struct *tty, struct file *filp)
}
info->throttle = 0;
tty_port_tty_set(&info->port, tty);
#ifdef CY_DEBUG_OPEN
printk(KERN_DEBUG "cyc:cy_open done\n");
......@@ -2705,13 +2712,13 @@ static void cy_close(struct tty_struct *tty, struct file *filp)
}
spin_unlock_irqrestore(&card->card_lock, flags);
shutdown(info);
cy_shutdown(info, tty);
cy_flush_buffer(tty);
tty_ldisc_flush(tty);
spin_lock_irqsave(&card->card_lock, flags);
tty->closing = 0;
info->port.tty = NULL;
tty_port_tty_set(&info->port, NULL);
if (info->port.blocked_open) {
spin_unlock_irqrestore(&card->card_lock, flags);
if (info->port.close_delay) {
......@@ -2957,7 +2964,7 @@ static void cyy_baud_calc(struct cyclades_port *info, __u32 baud)
* This routine finds or computes the various line characteristics.
* It used to be called config_setup
*/
static void set_line_char(struct cyclades_port *info)
static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
{
struct cyclades_card *card;
unsigned long flags;
......@@ -2967,28 +2974,26 @@ static void set_line_char(struct cyclades_port *info)
int baud, baud_rate = 0;
int i;
if (!info->port.tty || !info->port.tty->termios)
if (!tty->termios) /* XXX can this happen at all? */
return;
if (info->line == -1)
return;
cflag = info->port.tty->termios->c_cflag;
iflag = info->port.tty->termios->c_iflag;
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/*
* Set up the tty->alt_speed kludge
*/
if (info->port.tty) {
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->port.tty->alt_speed = 57600;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->port.tty->alt_speed = 115200;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->port.tty->alt_speed = 230400;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->port.tty->alt_speed = 460800;
}
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
tty->alt_speed = 57600;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
tty->alt_speed = 115200;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
tty->alt_speed = 230400;
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
tty->alt_speed = 460800;
card = info->card;
channel = info->line - card->first_line;
......@@ -2998,7 +3003,7 @@ static void set_line_char(struct cyclades_port *info)
index = card->bus_index;
/* baud rate */
baud = tty_get_baud_rate(info->port.tty);
baud = tty_get_baud_rate(tty);
if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
ASYNC_SPD_CUST) {
if (info->custom_divisor)
......@@ -3123,9 +3128,8 @@ static void set_line_char(struct cyclades_port *info)
/* set line characteristics according configuration */
cy_writeb(base_addr + (CySCHR1 << index),
START_CHAR(info->port.tty));
cy_writeb(base_addr + (CySCHR2 << index), STOP_CHAR(info->port.tty));
cy_writeb(base_addr + (CySCHR1 << index), START_CHAR(tty));
cy_writeb(base_addr + (CySCHR2 << index), STOP_CHAR(tty));
cy_writeb(base_addr + (CyCOR1 << index), info->cor1);
cy_writeb(base_addr + (CyCOR2 << index), info->cor2);
cy_writeb(base_addr + (CyCOR3 << index), info->cor3);
......@@ -3141,7 +3145,7 @@ static void set_line_char(struct cyclades_port *info)
(info->default_timeout ? info->default_timeout : 0x02));
/* 10ms rx timeout */
if (C_CLOCAL(info->port.tty)) {
if (C_CLOCAL(tty)) {
/* without modem intr */
cy_writeb(base_addr + (CySRER << index),
readb(base_addr + (CySRER << index)) | CyMdmCh);
......@@ -3204,8 +3208,7 @@ static void set_line_char(struct cyclades_port *info)
#endif
}
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
clear_bit(TTY_IO_ERROR, &tty->flags);
spin_unlock_irqrestore(&card->card_lock, flags);
} else {
......@@ -3224,7 +3227,7 @@ static void set_line_char(struct cyclades_port *info)
ch_ctrl = &(zfw_ctrl->ch_ctrl[channel]);
/* baud rate */
baud = tty_get_baud_rate(info->port.tty);
baud = tty_get_baud_rate(tty);
if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
ASYNC_SPD_CUST) {
if (info->custom_divisor)
......@@ -3335,8 +3338,7 @@ static void set_line_char(struct cyclades_port *info)
"was %x\n", info->line, retval);
}
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
clear_bit(TTY_IO_ERROR, &tty->flags);
}
} /* set_line_char */
......@@ -3365,7 +3367,7 @@ get_serial_info(struct cyclades_port *info,
} /* get_serial_info */
static int
set_serial_info(struct cyclades_port *info,
cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
struct serial_struct __user *new_info)
{
struct serial_struct new_serial;
......@@ -3403,10 +3405,10 @@ set_serial_info(struct cyclades_port *info,
check_and_exit:
if (info->port.flags & ASYNC_INITIALIZED) {
set_line_char(info);
cy_set_line_char(info, tty);
return 0;
} else {
return startup(info);
return cy_startup(info, tty);
}
} /* set_serial_info */
......@@ -3955,7 +3957,7 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
ret_val = get_serial_info(info, argp);
break;
case TIOCSSERIAL:
ret_val = set_serial_info(info, argp);
ret_val = cy_set_serial_info(info, tty, argp);
break;
case TIOCSERGETLSR: /* Get line status register */
ret_val = get_lsr_info(info, argp);
......@@ -4055,7 +4057,7 @@ static void cy_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
printk(KERN_DEBUG "cyc:cy_set_termios ttyC%d\n", info->line);
#endif
set_line_char(info);
cy_set_line_char(info, tty);
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
......@@ -4299,13 +4301,13 @@ static void cy_hangup(struct tty_struct *tty)
return;
cy_flush_buffer(tty);
shutdown(info);
cy_shutdown(info, tty);
info->port.count = 0;
#ifdef CY_DEBUG_COUNT
printk(KERN_DEBUG "cyc:cy_hangup (%d): setting count to 0\n",
current->pid);
#endif
info->port.tty = NULL;
tty_port_tty_set(&info->port, NULL);
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
wake_up_interruptible(&info->port.open_wait);
} /* cy_hangup */
......@@ -5191,18 +5193,30 @@ static int cyclades_proc_show(struct seq_file *m, void *v)
for (j = 0; j < cy_card[i].nports; j++) {
info = &cy_card[i].ports[j];
if (info->port.count)
if (info->port.count) {
/* XXX is the ldisc num worth this? */
struct tty_struct *tty;
struct tty_ldisc *ld;
int num = 0;
tty = tty_port_tty_get(&info->port);
if (tty) {
ld = tty_ldisc_ref(tty);
if (ld) {
num = ld->ops->num;
tty_ldisc_deref(ld);
}
tty_kref_put(tty);
}
seq_printf(m, "%3d %8lu %10lu %8lu "
"%10lu %8lu %9lu %6ld\n", info->line,
"%10lu %8lu %9lu %6d\n", info->line,
(cur_jifs - info->idle_stats.in_use) /
HZ, info->idle_stats.xmit_bytes,
(cur_jifs - info->idle_stats.xmit_idle)/
HZ, info->idle_stats.recv_bytes,
(cur_jifs - info->idle_stats.recv_idle)/
HZ, info->idle_stats.overruns,
/* FIXME: double check locking */
(long)info->port.tty->ldisc->ops->num);
else
num);
} else
seq_printf(m, "%3d %8lu %10lu %8lu "
"%10lu %8lu %9lu %6ld\n",
info->line, 0L, 0L, 0L, 0L, 0L, 0L, 0L);
......
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