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xen-blkfront: don't add indirect pages to list when !feature_persistent 

We should consider info->feature_persistent when adding indirect page to list
info->indirect_pages, else the BUG_ON() in blkif_free() would be triggered.

When we are using persistent grants the indirect_pages list
should always be empty because blkfront has pre-allocated enough
persistent pages to fill all requests on the ring.

CC: stable@vger.kernel.org
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Bob Liu 2015-07-22 14:40:09 +08:00 committed by Konrad Rzeszutek Wilk
parent d50babbe30
commit 7b0767502b
1 changed files with 4 additions and 2 deletions
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2
drivers/block/xen-blkfront.c
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@ -1135,8 +1135,10 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
* Add the used indirect page back to the list of
* available pages for indirect grefs.
*/
if (!info->feature_persistent) {
indirect_page = pfn_to_page(s->indirect_grants[i]->pfn);
list_add(&indirect_page->lru, &info->indirect_pages);
}
s->indirect_grants[i]->gref = GRANT_INVALID_REF;
list_add_tail(&s->indirect_grants[i]->node, &info->grants);
}