tty/serial: lay the foundations for the next set of reworks
- Stop drivers calling their own flush method indirectly, it obfuscates code
and it will change soon anyway
- A few more lock_kernel paths temporarily needed in some driver internal
waiting code
- Remove private put_char method that does a write call for one char - we
have that anyway
- Most but not yet all of the termios copy under lock fixing (some has other
dependencies to follow)
- Note a few locking bugs in drivers found in the process
- Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to
fix the termios locking
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 88e7c1d..8b9af73 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -3581,8 +3581,9 @@
unsigned int set, unsigned int clear)
{
struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+ unsigned long flags;
- lock_kernel();
+ local_irq_save(flags);
if (clear & TIOCM_RTS)
e100_rts(info, 0);
@@ -3604,7 +3605,7 @@
if (set & TIOCM_CD)
e100_cd_out(info, 1);
- unlock_kernel();
+ local_irq_restore(flags);
return 0;
}
@@ -3613,8 +3614,10 @@
{
struct e100_serial *info = (struct e100_serial *)tty->driver_data;
unsigned int result;
+ unsigned long flags;
- lock_kernel();
+ local_irq_save(flags);
+
result =
(!E100_RTS_GET(info) ? TIOCM_RTS : 0)
| (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
@@ -3623,7 +3626,7 @@
| (!E100_CD_GET(info) ? TIOCM_CAR : 0)
| (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
- unlock_kernel();
+ local_irq_restore(flags);
#ifdef SERIAL_DEBUG_IO
printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
@@ -3702,10 +3705,6 @@
{
struct e100_serial *info = (struct e100_serial *)tty->driver_data;
- if (tty->termios->c_cflag == old_termios->c_cflag &&
- tty->termios->c_iflag == old_termios->c_iflag)
- return;
-
change_speed(info);
/* Handle turning off CRTSCTS */
@@ -3808,10 +3807,8 @@
#endif
shutdown(info);
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
+ rs_flush_buffer(tty);
+ tty_ldisc_flush_buffer(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
@@ -3885,6 +3882,7 @@
* Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
* R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
*/
+ lock_kernel();
orig_jiffies = jiffies;
while (info->xmit.head != info->xmit.tail || /* More in send queue */
(*info->ostatusadr & 0x007f) || /* more in FIFO */
@@ -3901,6 +3899,7 @@
curr_time_usec - info->last_tx_active_usec;
}
set_current_state(TASK_RUNNING);
+ unlock_kernel();
}
/*