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

Dan Carpenter dan.carpenter at oracle.com
Sat Dec 1 18:39:29 UTC 2012


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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