linux-kernel - Re: [RFC PATCH] staging, android, ashmem: invalidate pin/unpin ioctl for private map

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Message-ID: <20121201183929.GA6568@mwanda>
Date:	Sat, 1 Dec 2012 21:39:29 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, Robert Love <rlove@...gle.com>,
	Brian Swetland <swetland@...gle.com>,
	linux-kernel@...r.kernel.org, Dima Zavin <dima@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Colin Cross <ccross@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [RFC PATCH] staging, android, ashmem: invalidate pin/unpin ioctl
 for private map

On Sat, Dec 01, 2012 at 02:45:57AM +0900, Joonsoo Kim wrote:
> @@ -614,21 +616,35 @@ static int ashmem_pin_unpin(struct ashmem_area *asma, unsigned long cmd,
>  	pgstart = pin.offset / PAGE_SIZE;
>  	pgend = pgstart + (pin.len / PAGE_SIZE) - 1;
>  
> -	mutex_lock(&ashmem_mutex);
> +	if (asma->shared_mapping) {
> +		mutex_lock(&ashmem_mutex);

Wouldn't we need to hold the mutex while we check the
->shared_mapping?

regards,
dan carpenter

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