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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/char/synclinkmp.c
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@@ -3365,7 +3365,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, port->count );
tty_unlock();
schedule();
tty_lock();
}
set_current_state(TASK_RUNNING);