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| author | Bob Liu <bob.liu@oracle.com> | 2015-07-22 08:40:09 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2015-07-24 15:09:16 +0200 |
| commit | 7b0767502b5db11cb1f0daef2d01f6d71b1192dc (patch) | |
| tree | 602757756fa51dbe32b67fbd584495ab58edb69c /drivers/block/xen-blkfront.c | |
| parent | xen-blkfront: introduce blkfront_gather_backend_features() (diff) | |
| download | linux-7b0767502b5db11cb1f0daef2d01f6d71b1192dc.tar.xz linux-7b0767502b5db11cb1f0daef2d01f6d71b1192dc.zip | |
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>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index f45f4e67c5d4..44b33d39441b 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -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. */ - indirect_page = pfn_to_page(s->indirect_grants[i]->pfn); - list_add(&indirect_page->lru, &info->indirect_pages); + 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); } |