PATCH: Ressurrect the esp serial driver
From: Alan Cox
Date: Tue Mar 08 2005 - 08:19:25 EST
Another first pass rescue run. Fix up for modern locking, make it build
and check over. It could still do with other fixes (sleep_on etc) but
it's a start
Alan
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
--- linux.vanilla-2.6.11/drivers/char/esp.c 2005-03-05 15:17:01.000000000 +0000
+++ linux-2.6.11/drivers/char/esp.c 2005-03-08 13:02:04.347993528 +0000
@@ -129,8 +129,6 @@
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
-#define _INLINE_ inline
-
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
@@ -211,15 +209,14 @@
if (serial_paranoia_check(info, tty->name, "rs_stop"))
return;
-
- save_flags(flags); cli();
+
+ spin_lock_irqsave(&info->lock, flags);
if (info->IER & UART_IER_THRI) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
}
-
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_start(struct tty_struct *tty)
@@ -230,13 +227,13 @@
if (serial_paranoia_check(info, tty->name, "rs_start"))
return;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
/*
@@ -264,34 +261,41 @@
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
-static _INLINE_ void rs_sched_event(struct esp_struct *info,
+static inline void rs_sched_event(struct esp_struct *info,
int event)
{
info->event |= 1 << event;
schedule_work(&info->tqueue);
}
-static _INLINE_ struct esp_pio_buffer *get_pio_buffer(void)
+static DEFINE_SPINLOCK(pio_lock);
+
+static inline struct esp_pio_buffer *get_pio_buffer(void)
{
struct esp_pio_buffer *buf;
+ unsigned long flags;
+ spin_lock_irqsave(&pio_lock, flags);
if (free_pio_buf) {
buf = free_pio_buf;
free_pio_buf = buf->next;
} else {
buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
}
-
+ spin_unlock_irqrestore(&pio_lock, flags);
return buf;
}
-static _INLINE_ void release_pio_buffer(struct esp_pio_buffer *buf)
+static inline void release_pio_buffer(struct esp_pio_buffer *buf)
{
+ unsigned long flags;
+ spin_lock_irqsave(&pio_lock, flags);
buf->next = free_pio_buf;
free_pio_buf = buf;
+ spin_unlock_irqrestore(&pio_lock, flags);
}
-static _INLINE_ void receive_chars_pio(struct esp_struct *info, int num_bytes)
+static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
{
struct tty_struct *tty = info->tty;
int i;
@@ -311,8 +315,6 @@
return;
}
- sti();
-
status_mask = (info->read_status_mask >> 2) & 0x07;
for (i = 0; i < num_bytes - 1; i += 2) {
@@ -329,8 +331,6 @@
(serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
}
- cli();
-
/* make sure everything is still ok since interrupts were enabled */
tty = info->tty;
@@ -371,7 +371,7 @@
release_pio_buffer(err_buf);
}
-static _INLINE_ void receive_chars_dma(struct esp_struct *info, int num_bytes)
+static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
{
unsigned long flags;
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
@@ -390,7 +390,7 @@
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
}
-static _INLINE_ void receive_chars_dma_done(struct esp_struct *info,
+static inline void receive_chars_dma_done(struct esp_struct *info,
int status)
{
struct tty_struct *tty = info->tty;
@@ -450,7 +450,9 @@
dma_bytes = 0;
}
-static _INLINE_ void transmit_chars_pio(struct esp_struct *info,
+/* Caller must hold info->lock */
+
+static inline void transmit_chars_pio(struct esp_struct *info,
int space_avail)
{
int i;
@@ -478,8 +480,6 @@
info->xmit_tail = (info->xmit_tail + space_avail) &
(ESP_XMIT_SIZE - 1);
- sti();
-
for (i = 0; i < space_avail - 1; i += 2) {
outw(*((unsigned short *)(pio_buf->data + i)),
info->port + UART_ESI_TX);
@@ -489,8 +489,6 @@
serial_out(info, UART_ESI_TX,
pio_buf->data[space_avail - 1]);
- cli();
-
if (info->xmit_cnt) {
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
@@ -520,7 +518,8 @@
release_pio_buffer(pio_buf);
}
-static _INLINE_ void transmit_chars_dma(struct esp_struct *info, int num_bytes)
+/* Caller must hold info->lock */
+static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
{
unsigned long flags;
@@ -567,7 +566,7 @@
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
}
-static _INLINE_ void transmit_chars_dma_done(struct esp_struct *info)
+static inline void transmit_chars_dma_done(struct esp_struct *info)
{
int num_bytes;
unsigned long flags;
@@ -601,7 +600,7 @@
}
}
-static _INLINE_ void check_modem_status(struct esp_struct *info)
+static inline void check_modem_status(struct esp_struct *info)
{
int status;
@@ -654,10 +653,10 @@
err_status = 0;
scratch = serial_in(info, UART_ESI_SID);
- cli();
+ spin_lock(&info->lock);
if (!info->tty) {
- sti();
+ spin_unlock(&info->lock);
return IRQ_NONE;
}
@@ -740,7 +739,7 @@
#ifdef SERIAL_DEBUG_INTR
printk("end.\n");
#endif
- sti();
+ spin_unlock(&info->lock);
return IRQ_HANDLED;
}
@@ -789,10 +788,12 @@
* figure out the appropriate timeout for an interrupt chain, routines
* to initialize and startup a serial port, and routines to shutdown a
* serial port. Useful stuff like that.
+ *
+ * Caller should hold lock
* ---------------------------------------------------------------
*/
-static _INLINE_ void esp_basic_init(struct esp_struct * info)
+static inline void esp_basic_init(struct esp_struct * info)
{
/* put ESPC in enhanced mode */
serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
@@ -859,13 +860,13 @@
int retval=0;
unsigned int num_chars;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
if (info->flags & ASYNC_INITIALIZED)
goto out;
if (!info->xmit_buf) {
- info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
+ info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
retval = -ENOMEM;
if (!info->xmit_buf)
goto out;
@@ -900,6 +901,8 @@
if (info->stat_flags & ESP_STAT_NEVER_DMA)
info->stat_flags |= ESP_STAT_USE_PIO;
+
+ spin_unlock_irqrestore(&info->lock, flags);
/*
* Allocate the IRQ
@@ -915,7 +918,7 @@
&info->tty->flags);
retval = 0;
}
- goto out;
+ goto out_unlocked;
}
if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
@@ -935,6 +938,8 @@
}
info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
serial_out(info, UART_ESI_CMD2, UART_MCR);
serial_out(info, UART_ESI_CMD2, info->MCR);
@@ -951,6 +956,7 @@
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ spin_unlock_irqrestore(&info->lock, flags);
/*
* Set up the tty->alt_speed kludge
@@ -970,10 +976,12 @@
* set the speed of the serial port
*/
change_speed(info);
-
info->flags |= ASYNC_INITIALIZED;
- retval = 0;
-out: restore_flags(flags);
+ return 0;
+
+out:
+ spin_unlock_irqrestore(&info->lock, flags);
+out_unlocked:
return retval;
}
@@ -993,8 +1001,7 @@
info->irq);
#endif
- save_flags(flags); cli(); /* Disable interrupts */
-
+ spin_lock_irqsave(&info->lock, flags);
/*
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
* here so the queue might never be waken up
@@ -1003,7 +1010,7 @@
wake_up_interruptible(&info->break_wait);
/* stop a DMA transfer on the port being closed */
-
+ /* DMA lock is higher priority always */
if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
f=claim_dma_lock();
disable_dma(dma);
@@ -1058,7 +1065,7 @@
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
/*
@@ -1172,7 +1179,7 @@
if (I_IXOFF(info->tty))
flow1 |= 0x81;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
/* set baud */
serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
serial_out(info, UART_ESI_CMD2, quot >> 8);
@@ -1218,8 +1225,8 @@
serial_out(info, UART_ESI_CMD2, info->config.flow_off);
serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
serial_out(info, UART_ESI_CMD2, info->config.flow_on);
-
- restore_flags(flags);
+
+ spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
@@ -1233,16 +1240,13 @@
if (!tty || !info->xmit_buf)
return;
- save_flags(flags); cli();
- if (info->xmit_cnt >= ESP_XMIT_SIZE - 1) {
- restore_flags(flags);
- return;
+ spin_lock_irqsave(&info->lock, flags);
+ if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
+ info->xmit_buf[info->xmit_head++] = ch;
+ info->xmit_head &= ESP_XMIT_SIZE-1;
+ info->xmit_cnt++;
}
-
- info->xmit_buf[info->xmit_head++] = ch;
- info->xmit_head &= ESP_XMIT_SIZE-1;
- info->xmit_cnt++;
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_flush_chars(struct tty_struct *tty)
@@ -1253,16 +1257,18 @@
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
return;
+ spin_lock_irqsave(&info->lock, flags);
+
if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
- return;
+ goto out;
- save_flags(flags); cli();
if (!(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
}
- restore_flags(flags);
+out:
+ spin_unlock_irqrestore(&info->lock, flags);
}
static int rs_write(struct tty_struct * tty,
@@ -1305,7 +1311,7 @@
ret += c;
}
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
@@ -1313,7 +1319,7 @@
serial_out(info, UART_ESI_CMD2, info->IER);
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
return ret;
}
@@ -1321,12 +1327,17 @@
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
int ret;
+ unsigned long flags;
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
return 0;
+
+ spin_lock_irqsave(&info->lock, flags);
+
ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
if (ret < 0)
ret = 0;
+ spin_unlock_irqrestore(&info->lock, flags);
return ret;
}
@@ -1342,12 +1353,13 @@
static void rs_flush_buffer(struct tty_struct *tty)
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
return;
- cli();
+ spin_lock_irqsave(&info->lock, flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
tty_wakeup(tty);
}
@@ -1362,6 +1374,7 @@
static void rs_throttle(struct tty_struct * tty)
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
@@ -1371,19 +1384,20 @@
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
return;
-
- cli();
+
+ spin_lock_irqsave(&info->lock, flags);
info->IER &= ~UART_IER_RDI;
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
serial_out(info, UART_ESI_CMD2, 0x00);
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
@@ -1394,13 +1408,13 @@
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
return;
- cli();
+ spin_lock_irqsave(&info->lock, flags);
info->IER |= UART_IER_RDI;
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
}
/*
@@ -1573,6 +1587,7 @@
unsigned int change_dma;
int retval = 0;
struct esp_struct *current_async;
+ unsigned long flags;
/* Perhaps a non-sysadmin user should be able to do some of these */
/* operations. I haven't decided yet. */
@@ -1628,12 +1643,14 @@
/* all ports must use the same DMA channel */
+ spin_lock_irqsave(&info->lock, flags);
current_async = ports;
while (current_async) {
esp_basic_init(current_async);
current_async = current_async->next_port;
}
+ spin_unlock_irqrestore(&info->lock, flags);
} else {
/* DMA mode to PIO mode only */
@@ -1641,8 +1658,10 @@
return -EBUSY;
shutdown(info);
+ spin_lock_irqsave(&info->lock, flags);
info->stat_flags |= ESP_STAT_NEVER_DMA;
esp_basic_init(info);
+ spin_unlock_irqrestore(&info->lock, flags);
}
}
@@ -1654,13 +1673,14 @@
info->config.flow_off = new_config.flow_off;
info->config.flow_on = new_config.flow_on;
- save_flags(flags); cli();
+
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
serial_out(info, UART_ESI_CMD2, new_config.flow_off);
serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
serial_out(info, UART_ESI_CMD2, new_config.flow_on);
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
if ((new_config.rx_trigger != info->config.rx_trigger) ||
@@ -1669,7 +1689,7 @@
info->config.rx_trigger = new_config.rx_trigger;
info->config.tx_trigger = new_config.tx_trigger;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
serial_out(info, UART_ESI_CMD2,
new_config.rx_trigger >> 8);
@@ -1677,14 +1697,14 @@
serial_out(info, UART_ESI_CMD2,
new_config.tx_trigger >> 8);
serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
if (new_config.rx_timeout != info->config.rx_timeout) {
unsigned long flags;
info->config.rx_timeout = new_config.rx_timeout;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
if (info->IER & UART_IER_RDI) {
serial_out(info, UART_ESI_CMD1,
@@ -1693,7 +1713,7 @@
new_config.rx_timeout);
}
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
if (!(info->flags & ASYNC_INITIALIZED))
@@ -1716,11 +1736,12 @@
{
unsigned char status;
unsigned int result;
+ unsigned long flags;
- cli();
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
status = serial_in(info, UART_ESI_STAT1);
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
return put_user(result,value);
}
@@ -1730,6 +1751,7 @@
{
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
unsigned char control, status;
+ unsigned long flags;
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
return -ENODEV;
@@ -1737,10 +1759,12 @@
return -EIO;
control = info->MCR;
- cli();
+
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
status = serial_in(info, UART_ESI_STAT2);
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
+
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
| ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
@@ -1753,13 +1777,14 @@
unsigned int set, unsigned int clear)
{
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
- cli();
+ spin_lock_irqsave(&info->lock, flags);
if (set & TIOCM_RTS)
info->MCR |= UART_MCR_RTS;
@@ -1774,7 +1799,8 @@
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
serial_out(info, UART_ESI_CMD2, UART_MCR);
serial_out(info, UART_ESI_CMD2, info->MCR);
- sti();
+
+ spin_unlock_irqrestore(&info->lock, flags);
return 0;
}
@@ -1789,17 +1815,20 @@
if (serial_paranoia_check(info, tty->name, "esp_break"))
return;
- save_flags(flags); cli();
if (break_state == -1) {
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
serial_out(info, UART_ESI_CMD2, 0x01);
+ spin_unlock_irqrestore(&info->lock, flags);
+ /* FIXME - new style wait needed here */
interruptible_sleep_on(&info->break_wait);
} else {
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
serial_out(info, UART_ESI_CMD2, 0x00);
+ spin_unlock_irqrestore(&info->lock, flags);
}
- restore_flags(flags);
}
static int rs_ioctl(struct tty_struct *tty, struct file * file,
@@ -1809,6 +1838,7 @@
struct async_icount cprev, cnow; /* kernel counter temps */
struct serial_icounter_struct __user *p_cuser; /* user space */
void __user *argp = (void __user *)arg;
+ unsigned long flags;
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
return -ENODEV;
@@ -1849,17 +1879,18 @@
* Caller should use TIOCGICOUNT to see which one it was
*/
case TIOCMIWAIT:
- cli();
+ spin_lock_irqsave(&info->lock, flags);
cprev = info->icount; /* note the counters on entry */
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
while (1) {
+ /* FIXME: convert to new style wakeup */
interruptible_sleep_on(&info->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
- cli();
+ spin_lock_irqsave(&info->lock, flags);
cnow = info->icount; /* atomic copy */
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
if (cnow.rng == cprev.rng &&
cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd &&
@@ -1886,9 +1917,9 @@
* RI where only 0->1 is counted.
*/
case TIOCGICOUNT:
- cli();
+ spin_lock_irqsave(&info->lock, flags);
cnow = info->icount;
- sti();
+ spin_unlock_irqrestore(&info->lock, flags);
p_cuser = argp;
if (put_user(cnow.cts, &p_cuser->cts) ||
put_user(cnow.dsr, &p_cuser->dsr) ||
@@ -1911,53 +1942,42 @@
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
+ unsigned long flags;
if ( (tty->termios->c_cflag == old_termios->c_cflag)
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
- return;
+ return;
change_speed(info);
+ spin_lock_irqsave(&info->lock, flags);
+
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) &&
!(tty->termios->c_cflag & CBAUD)) {
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- cli();
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
serial_out(info, UART_ESI_CMD2, UART_MCR);
serial_out(info, UART_ESI_CMD2, info->MCR);
- sti();
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
(tty->termios->c_cflag & CBAUD)) {
info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
- cli();
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
serial_out(info, UART_ESI_CMD2, UART_MCR);
serial_out(info, UART_ESI_CMD2, info->MCR);
- sti();
}
+ spin_unlock_irqrestore(&info->lock, flags);
+
/* Handle turning of CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
rs_start(tty);
}
-
-#if 0
- /*
- * No need to wake up processes in open wait, since they
- * sample the CLOCAL flag once, and don't recheck it.
- * XXX It's not clear whether the current behavior is correct
- * or not. Hence, this may change.....
- */
- if (!(old_termios->c_cflag & CLOCAL) &&
- (tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&info->open_wait);
-#endif
}
/*
@@ -1978,7 +1998,7 @@
if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
return;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
if (tty_hung_up_p(filp)) {
DBG_CNT("before DEC-hung");
@@ -2010,6 +2030,8 @@
goto out;
}
info->flags |= ASYNC_CLOSING;
+
+ spin_unlock_irqrestore(&info->lock, flags);
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
@@ -2027,12 +2049,16 @@
info->IER &= ~UART_IER_RDI;
info->read_status_mask &= ~UART_LSR_DR;
if (info->flags & ASYNC_INITIALIZED) {
+
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
serial_out(info, UART_ESI_CMD2, info->IER);
/* disable receive timeout */
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
serial_out(info, UART_ESI_CMD2, 0x00);
+
+ spin_unlock_irqrestore(&info->lock, flags);
/*
* Before we drop DTR, make sure the UART transmitter
@@ -2057,8 +2083,10 @@
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
+ return;
+
out:
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
@@ -2076,12 +2104,14 @@
if (!char_time)
char_time = 1;
- save_flags(flags); cli();
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
(serial_in(info, UART_ESI_STAT2) != 0xff)) {
+
+ spin_unlock_irqrestore(&info->lock, flags);
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
@@ -2090,11 +2120,11 @@
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
+ spin_lock_irqsave(&info->lock, flags);
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
}
-
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
set_current_state(TASK_RUNNING);
}
@@ -2174,15 +2204,11 @@
printk("block_til_ready before block: ttys%d, count = %d\n",
info->line, info->count);
#endif
- save_flags(flags);
- cli();
+ spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp))
info->count--;
- restore_flags(flags);
info->blocked_open++;
while (1) {
- save_flags(flags);
- cli();
if ((tty->termios->c_cflag & CBAUD)) {
unsigned int scratch;
@@ -2194,7 +2220,6 @@
serial_out(info, UART_ESI_CMD2,
scratch | UART_MCR_DTR | UART_MCR_RTS);
}
- restore_flags(flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(info->flags & ASYNC_INITIALIZED)) {
@@ -2224,13 +2249,16 @@
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, info->count);
#endif
+ spin_unlock_irqrestore(&info->lock, flags);
schedule();
+ spin_lock_irqsave(&info->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp))
info->count++;
info->blocked_open--;
+ spin_unlock_irqrestore(&info->lock, flags);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, info->count);
@@ -2251,6 +2279,7 @@
{
struct esp_struct *info;
int retval, line;
+ unsigned long flags;
line = tty->index;
if ((line < 0) || (line >= NR_PORTS))
@@ -2262,7 +2291,7 @@
while (info && (info->line != line))
info = info->next_port;
-
+
if (!info) {
serial_paranoia_check(info, tty->name, "esp_open");
return -ENODEV;
@@ -2271,6 +2300,7 @@
#ifdef SERIAL_DEBUG_OPEN
printk("esp_open %s, count = %d\n", tty->name, info->count);
#endif
+ spin_lock_irqsave(&info->lock, flags);
info->count++;
tty->driver_data = info;
info->tty = tty;
@@ -2317,7 +2347,7 @@
* driver.
*/
-static _INLINE_ void show_serial_version(void)
+static inline void show_serial_version(void)
{
printk(KERN_INFO "%s version %s (DMA %u)\n",
serial_name, serial_version, dma);
@@ -2327,7 +2357,7 @@
* This routine is called by espserial_init() to initialize a specific serial
* port.
*/
-static _INLINE_ int autoconfig(struct esp_struct * info)
+static inline int autoconfig(struct esp_struct * info)
{
int port_detected = 0;
unsigned long flags;
@@ -2335,8 +2365,7 @@
if (!request_region(info->port, REGION_SIZE, "esp serial"))
return -EIO;
- save_flags(flags); cli();
-
+ spin_lock_irqsave(&info->lock, flags);
/*
* Check for ESP card
*/
@@ -2372,7 +2401,7 @@
if (!port_detected)
release_region(info->port, REGION_SIZE);
- restore_flags(flags);
+ spin_unlock_irqrestore(&info->lock, flags);
return (port_detected);
}
@@ -2513,6 +2542,7 @@
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->delta_msr_wait);
init_waitqueue_head(&info->break_wait);
+ spin_lock_init(&info->lock);
ports = info;
printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
info->line, info->port, info->irq);
@@ -2563,18 +2593,14 @@
static void __exit espserial_exit(void)
{
- unsigned long flags;
int e1;
struct esp_struct *temp_async;
struct esp_pio_buffer *pio_buf;
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
- save_flags(flags);
- cli();
if ((e1 = tty_unregister_driver(esp_driver)))
printk("SERIAL: failed to unregister serial driver (%d)\n",
e1);
- restore_flags(flags);
put_tty_driver(esp_driver);
while (ports) {
-
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