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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-27 11:41:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-27 11:41:51 -0700
commit49fdf6785fd660e18a1eb4588928f47e9fa29a9a (patch)
tree71cccf385d734bfc33e9cd4752b5046aef99c130 /include
parentb70a6b27ed4cbb9ea7a4e1abc080ed65692ecb9b (diff)
parent43a49cbdf31e812c0d8f553d433b09b421f5d52c (diff)
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: libata: fix NCQ devices behind port multipliers scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map
Diffstat (limited to 'include')
-rw-r--r--include/scsi/scsi_tcq.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index cf4c219c0b5..17231385cb3 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -140,8 +140,18 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag)
*/
static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
{
- shost->bqt = blk_init_tags(depth);
- return shost->bqt ? 0 : -ENOMEM;
+ /*
+ * If the shared tag map isn't already initialized, do it now.
+ * This saves callers from having to check ->bqt when setting up
+ * devices on the shared host (for libata)
+ */
+ if (!shost->bqt) {
+ shost->bqt = blk_init_tags(depth);
+ if (!shost->bqt)
+ return -ENOMEM;
+ }
+
+ return 0;
}
/**