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cxlflash: Fix location of setting resid 

The resid is incorrectly set which can lead to unnecessary retry
attempts by the stack. This is due to resid _always_ being set
using a value returned from the adapter. Instead, the value
should only be interpreted and set when in an underrun scenario.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Matthew R. Ochs 2015-10-21 15:13:29 -05:00 committed by James Bottomley
parent 018d1dc955
commit 8396012ff7
1 changed files with 8 additions and 12 deletions
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20
drivers/scsi/cxlflash/main.c
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@ -107,6 +107,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
{
struct sisl_ioarcb *ioarcb;
struct sisl_ioasa *ioasa;
u32 resid;
if (unlikely(!cmd))
return;
@ -115,9 +116,10 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
ioasa = &(cmd->sa);
if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) {
pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
__func__, cmd, scp);
scp->result = (DID_ERROR << 16);
resid = ioasa->resid;
scsi_set_resid(scp, resid);
pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
__func__, cmd, scp, resid);
}
if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) {
@ -158,8 +160,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* If the SISL_RC_FLAGS_OVERRUN flag was set,
* then we will handle this error else where.
* If not then we must handle it here.
* This is probably an AFU bug. We will
* attempt a retry to see if that resolves it.
* This is probably an AFU bug.
*/
scp->result = (DID_ERROR << 16);
}
@ -183,7 +184,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* We have an AFU error */
switch (ioasa->rc.afu_rc) {
case SISL_AFU_RC_NO_CHANNELS:
scp->result = (DID_MEDIUM_ERROR << 16);
scp->result = (DID_NO_CONNECT << 16);
break;
case SISL_AFU_RC_DATA_DMA_ERR:
switch (ioasa->afu_extra) {
@ -217,7 +218,6 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
static void cmd_complete(struct afu_cmd *cmd)
{
struct scsi_cmnd *scp;
u32 resid;
ulong lock_flags;
struct afu *afu = cmd->parent;
struct cxlflash_cfg *cfg = afu->parent;
@ -229,14 +229,11 @@ static void cmd_complete(struct afu_cmd *cmd)
if (cmd->rcb.scp) {
scp = cmd->rcb.scp;
if (unlikely(cmd->sa.rc.afu_rc ||
cmd->sa.rc.scsi_rc ||
cmd->sa.rc.fc_rc))
if (unlikely(cmd->sa.ioasc))
process_cmd_err(cmd, scp);
else
scp->result = (DID_OK << 16);
resid = cmd->sa.resid;
cmd_is_tmf = cmd->cmd_tmf;
cmd_checkin(cmd); /* Don't use cmd after here */
@ -244,7 +241,6 @@ static void cmd_complete(struct afu_cmd *cmd)
"ioasc=%d\n", __func__, scp, scp->result,
cmd->sa.ioasc);
scsi_set_resid(scp, resid);
scsi_dma_unmap(scp);
scp->scsi_done(scp);