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tty: release BTM while sleeping in block_til_ready

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Most tty drivers may block while opening a device.
Since this possibly depends on another thread
closing it first and both threads may need the BTM,
we need to release it here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arnd Bergmann
2010-06-01 22:53:10 +02:00
committed by Greg Kroah-Hartman
parent b07471fa51
commit e142a31da3
11 changed files with 25 additions and 1 deletions
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2
drivers/serial/68328serial.c
View File

@@ -1235,7 +1235,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
retval = -ERESTARTSYS;
break;
}
tty_unlock();
schedule();
tty_lock();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);

2
drivers/serial/68360serial.c
View File

@@ -1860,7 +1860,9 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
tty_unlock();
schedule();
tty_lock();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);

2
drivers/serial/crisv10.c
View File

@@ -4066,7 +4066,9 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
printk("block_til_ready blocking: ttyS%d, count = %d\n",
info->line, info->count);
#endif
tty_unlock();
schedule();
tty_lock();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);