linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Message-ID: <5151E590.70909@surriel.com>
Date:	Tue, 26 Mar 2013 14:14:40 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
CC:	Emmanuel Benisty <benisty.e@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	"Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: ipc,sem: sysv semaphore scalability

On 03/26/2013 01:59 PM, Davidlohr Bueso wrote:

> From: Davidlohr Bueso <davidlohr.bueso@...com>
> Subject: [PATCH] ipc, sem: prevent possible deadlock
>
> In semctl_main(), when cmd == GETALL, we're locking
> sma->sem_perm.lock (through sem_lock_and_putref), yet
> after the conditional, we lock it again.
> Unlock sma right after exiting the conditional.
>
> Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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