linux-kernel - Re: [PATCH] af_unix: Revert 'lock_interruptible' in stream receive code

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Message-Id: <20151217.153441.1336096182651045503.davem@davemloft.net>
Date:	Thu, 17 Dec 2015 15:34:41 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	rweikusat@...ileactivedefense.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] af_unix: Revert 'lock_interruptible' in stream receive
 code

From: Rainer Weikusat <rweikusat@...ileactivedefense.com>
Date: Wed, 16 Dec 2015 20:09:25 +0000

> With b3ca9b02b00704053a38bfe4c31dbbb9c13595d0, the AF_UNIX SOCK_STREAM
> receive code was changed from using mutex_lock(&u->readlock) to
> mutex_lock_interruptible(&u->readlock) to prevent signals from being
> delayed for an indefinite time if a thread sleeping on the mutex
> happened to be selected for handling the signal. But this was never a
> problem with the stream receive code (as opposed to its datagram
> counterpart) as that never went to sleep waiting for new messages with the
> mutex held and thus, wouldn't cause secondary readers to block on the
> mutex waiting for the sleeping primary reader. As the interruptible
> locking makes the code more complicated in exchange for no benefit,
> change it back to using mutex_lock.
> 
> Signed-off-by: Rainer Weikusat <rweikusat@...ileactivedefense.com>

Applied, thanks Rainer.
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