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tty: Prevent "read/write wait queue active!" log flooding 

Only print one warning when a task is on the read_wait or write_wait
wait queue at final tty release.

Cc: <stable@vger.kernel.org> # 3.4.x+
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-10-16 13:54:36 -04:00 committed by Greg Kroah-Hartman
parent 37b1645788
commit 494c1eac7e
1 changed files with 6 additions and 2 deletions
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8
drivers/tty/tty_io.c
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@ -1710,6 +1710,7 @@ int tty_release(struct inode *inode, struct file *filp)
int idx;
char buf[64];
long timeout = 0;
int once = 1;
if (tty_paranoia_check(tty, inode, __func__))
return 0;
@ -1790,8 +1791,11 @@ int tty_release(struct inode *inode, struct file *filp)
if (!do_sleep)
break;
printk(KERN_WARNING "%s: %s: read/write wait queue active!\n",
__func__, tty_name(tty, buf));
if (once) {
once = 0;
printk(KERN_WARNING "%s: %s: read/write wait queue active!\n",
__func__, tty_name(tty, buf));
}
tty_unlock_pair(tty, o_tty);
mutex_unlock(&tty_mutex);
schedule_timeout_killable(timeout);