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tty/serial: lay the foundations for the next set of reworks

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- 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>
This commit is contained in:
Alan Cox
2008-04-30 00:53:59 -07:00
committed by Linus Torvalds
parent ac0e4b7d31
commit 978e595f88
26 changed files with 189 additions and 234 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/char/synclinkmp.c
View File

@@ -862,8 +862,7 @@ static void close(struct tty_struct *tty, struct file *filp)
if (info->flags & ASYNC_INITIALIZED)
wait_until_sent(tty, info->timeout);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
flush_buffer(tty);
tty_ldisc_flush(tty);
@@ -1119,6 +1118,8 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
if (sanity_check(info, tty->name, "wait_until_sent"))
return;
lock_kernel();
if (!(info->flags & ASYNC_INITIALIZED))
goto exit;
@@ -1161,6 +1162,7 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
}
exit:
unlock_kernel();
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s wait_until_sent() exit\n",
__FILE__,__LINE__, info->device_name );
@@ -1176,6 +1178,7 @@ static int write_room(struct tty_struct *tty)
if (sanity_check(info, tty->name, "write_room"))
return 0;
lock_kernel();
if (info->params.mode == MGSL_MODE_HDLC) {
ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
} else {
@@ -1183,6 +1186,7 @@ static int write_room(struct tty_struct *tty)
if (ret < 0)
ret = 0;
}
unlock_kernel();
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s write_room()=%d\n",