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authorTejun Heo <tj@kernel.org>2009-05-19 11:33:05 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-05-19 11:36:08 +0200
commit5f49f63178360b07a095bd33b0d850d60edf7590 (patch)
tree23764399405214c115543eb5dec59982cf0baa26 /drivers/block/ub.c
parentub: use __blk_end_request_all() (diff)
downloadlinux-5f49f63178360b07a095bd33b0d850d60edf7590.tar.xz
linux-5f49f63178360b07a095bd33b0d850d60edf7590.zip
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 'drivers/block/ub.c')
-rw-r--r--drivers/block/ub.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index f32781cff456..e67bbae9547d 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -781,8 +781,10 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (cmd->error == 0) {
if (blk_pc_request(rq)) {
- if (cmd->act_len < blk_rq_bytes(rq))
- rq->resid_len = blk_rq_bytes(rq) - cmd->act_len;
+ if (cmd->act_len >= rq->resid_len)
+ rq->resid_len = 0;
+ else
+ rq->resid_len -= cmd->act_len;
scsi_status = 0;
} else {
if (cmd->act_len != cmd->len) {