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authorTejun Heo <tj@kernel.org>2009-05-19 13:33:05 +0400
committerJens Axboe <jens.axboe@oracle.com>2009-05-19 13:36:08 +0400
commit5f49f63178360b07a095bd33b0d850d60edf7590 (patch)
tree23764399405214c115543eb5dec59982cf0baa26 /block/blk-core.c
parent3755100dd5f66761aaaa7ae44c70b319a7c78a56 (diff)
downloadlinux-5f49f63178360b07a095bd33b0d850d60edf7590.tar.xz
block: set rq->resid_len to blk_rq_bytes() on issue
In commit c3a4d78c580de4edc9ef0f7c59812fb02ceb037f, while introducing rq->resid_len, the default value of residue count was changed from full count to zero. The conversion was done under the assumption that when a request fails residue count wasn't defined. However, Boaz and James pointed out that this wasn't true and the residue count should be preserved for failed requests too. This patchset restores the original behavior by setting rq->resid_len to blk_rq_bytes(rq) on request start and restoring explicit clearing in affected drivers. While at it, take advantage of the fact that rq->resid_len is set to full count where applicable. * ide-cd: rq->resid_len cleared on pc success * mptsas: req->resid_len cleared on success * sas_expander: rsp/req->resid_len cleared on success * mpt2sas_transport: req->resid_len cleared on success * ide-cd, ide-tape, mptsas, sas_host_smp, mpt2sas_transport, ub: take advantage of initial full count to simplify code Boaz Harrosh spotted bug in resid_len initialization. Fixed as suggested. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Borislav Petkov <petkovbb@googlemail.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Eric Moore <Eric.Moore@lsi.com> Cc: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index a2d97de1a12c..e3f7e6a3a095 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1783,9 +1783,10 @@ void blk_start_request(struct request *req)
blk_dequeue_request(req);
/*
- * We are now handing the request to the hardware, add the
- * timeout handler.
+ * We are now handing the request to the hardware, initialize
+ * resid_len to full count and add the timeout handler.
*/
+ req->resid_len = blk_rq_bytes(req);
blk_add_timer(req);
}
EXPORT_SYMBOL(blk_start_request);