linux-kernel - Re: use mutex instead of semaphore in RocketPort driver

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Date:	Tue, 22 May 2007 23:23:34 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Simon Arlott <simon@...e.lp0.eu>
CC:	Matthias Kaehlcke <matthias.kaehlcke@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: use mutex instead of semaphore in RocketPort driver

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
>>
> 
> 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.

Who? There are some drivers that returns ERESTARTSYS from write function.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
 B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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