linux-kernel - Re: [RFC 9/13] Char: nozomi, lock cleanup

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Message-Id: <200711101642.52289.fseidel@suse.de>
Date:	Sat, 10 Nov 2007 16:42:51 +0100
From:	Frank Seidel <fseidel@...e.de>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC 9/13] Char: nozomi, lock cleanup

On Samstag 10 November 2007 00:48:52, you (Jiri Slaby) wrote:
> nozomi, lock cleanup
> 
> - semaphore is deprecated, use mutex instead
> - don't return -ERESTARTSYS when signal might not be pending since it's not
>   permitted (unknown retval mioght reach userspace)
> - don't lock interruptible in close or the card might not be stopped on last
>   close

Good catches. But i had to change it a bit, especially the mutex_trylock.
>From mutex.c: "..it is negated to the down_trylock() return values!
Be careful about this when converting semaphores to mutexes." ;-)
Now it works again (doesn't deadlock my card anymore).

Thanks,
Frank
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