On 08/09/2013 09:07 AM, Alexander Gordeev wrote: > On Fri, Aug 09, 2013 at 08:24:38AM -0600, Jens Axboe wrote: >> On 08/09/2013 02:23 AM, Alexander Gordeev wrote: >>> + ap->qc_tags = blk_mq_init_tags(ATA_MAX_QUEUE, 1, NUMA_NO_NODE); >>> + if (!ap->qc_tags) { >>> + kfree(ap); >>> + return NULL; >>> + } >> >> This should be blk_mq_init_tags(ATA_MAX_QUEUE - 1, 1, ...) since the >> total depth is normal_tags + reserved_tags. > > Aha.. If blk_mq_init_tags() should be like this then? > > diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c > index dcbc2a4..b131a48 100644 > --- a/block/blk-mq-tag.c > +++ b/block/blk-mq-tag.c > @@ -468,10 +468,9 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, > * Rest of the tags start at the queue list > */ > tags->nr_free = 0; > - while (nr_tags - tags->nr_reserved) { > + while (nr_tags--) { > tags->freelist[tags->nr_free] = tags->nr_free + > tags->nr_reserved; > - nr_tags--; > tags->nr_free++; > } I misremembered, just checked the code. I think I used to have it like I described, but changed it since I thought it would be more logical to pass in full depth, and then what part of that is reserved. Looking at the current code, your patch looks correct as-is. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html