El Wed, May 23, 2007 at 06:25:49PM +0530 Satyam Sharma ha dit:
> On 5/23/07, Jiri Slaby <[email protected]> wrote:
> >Simon Arlott napsal(a):
> >> On 22/05/07 21:06, Matthias Kaehlcke wrote:
> >>> would the following resolve the problem?
> >>>
> >>> if(mutex_lock_interruptible(&info->write_mtx)) return
> >>> -ERESTARTSYS
> >>>
> >>> thanks for your comments
>
> Hum. I remember suggesting the fix when this came few weeks back,
> somehow the older version seems to have made it into Linus' tree.
i also remembered your suggestion but thought it was a similar case in
another driver. i think it's my fault that the older version made it
into the Linus tree cause i sent the patch in a new thread instead of
responding to the initial post :(
> >> No. At least one user of tty_operations/tty_driver's write function
> >> doesn't check the return value so it would never be retried, mutex_lock
> >> should be used instead.
>
> Replacing mutex_lock_interruptible() with a mutex_lock() could be a
> change in behaviour visible to userspace. Best to continue to use
> _interruptible. Returning EINTR would be safe choice because if
> Simon's right that this isn't retried, we could end up breaking
> userspace that isn't quite ready to see ERESTARTSYS coming out of
> a write(2), but ...
thanks for your fix!
--
Matthias Kaehlcke
Linux Application Developer
Barcelona
The yellow ships hung in the air just like bricks dont do
(The Hitch-Hiker's Guide to the Galaxy)
.''`.
using free software / Debian GNU/Linux | http://debian.org : :' :
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