[dm-devel] [PATCH] dm-mpath: Track invalid map_context

[Hannes Reinecke]

On 03/19/2012 04:20 PM, Alasdair G Kergon wrote:
> On Mon, Mar 19, 2012 at 04:15:28PM +0100, Hannes Reinecke wrote:
>> -	if (r < 0 || r == DM_MAPIO_REQUEUE)
>> +	if (r < 0 || r == DM_MAPIO_REQUEUE) {
>>  		mempool_free(mpio, m->mpio_pool);
>> +		map_context->ptr = NULL;
>> +	}
> 
> What about the other places that do mempool_free() ?
> Should they clear it too?
> 
Hmm. Probably. It's not strictly speaking required as the other
places will never re-use the context pointer.
But for consistencies sake you are correct.
Will be updating the patch.

> Is it better to swap the statement order - clear it *before*
> freeing i
> 
Doubt that should be required.
I would hope that the map_context pointer is protected by
appropriate locks.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)