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Prevent an O_NDELAY writer from blocking when a tty write is blocked by the tty atomic writer mutex

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Without this a tty write could block if a previous blocking tty write was
in progress on the same tty and blocked by a line discipline or hardware
event.  Originally found and reported by Dave Johnson.

Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Dave Johnson <djohnson+linux-kernel@sw.starentnetworks.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 2007-07-15 23:39:43 -07:00 • committed by Linus Torvalds
parent c9c64155f5
commit 9c1729db3e
5 changed files with 43 additions and 19 deletions
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6
include/linux/tty.h
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@ -338,6 +338,12 @@ extern struct tty_struct *get_current_tty(void);
extern struct mutex tty_mutex;
extern void tty_write_unlock(struct tty_struct *tty);
extern int tty_write_lock(struct tty_struct *tty, int ndelay);
#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
/* n_tty.c */
extern struct tty_ldisc tty_ldisc_N_TTY;