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authorK. Y. Srinivasan <kys@microsoft.com>2012-04-05 23:26:52 +0400
committerJames Bottomley <JBottomley@Parallels.com>2012-04-25 12:51:43 +0400
commit42e22cac4e57f3e0b4b631c9489effe97f7d7d6c (patch)
treec5b2767d0b8c2ef2c6f043f387c10b293360376a /drivers/scsi/storvsc_drv.c
parentc62eef0d1b592cfbe4793173e8af4098b13e4455 (diff)
downloadlinux-42e22cac4e57f3e0b4b631c9489effe97f7d7d6c.tar.xz
[SCSI] storvsc: Properly handle errors from the host
Hyper-V cannot process some commands like ATA_12 and ATA_16. It also returns a very generic error when this happens (SRB_STATUS_ERROR). Most of the time we treat SRB_STATUS_ERROR as DID_TARGET_FAILURE which causes error handler retry, but in the case of pass through commands, they'll never succeed (and the error handler will offline the device), so put a discriminating block in the command completion routing and send the SRB_STATUS_ERROR upwards with DID_PASSTHROUGH for commands we know should not be retried. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/storvsc_drv.c')
-rw-r--r--drivers/scsi/storvsc_drv.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 83a1972a1999..528d52beaa1c 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -785,12 +785,22 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
/*
* If there is an error; offline the device since all
* error recovery strategies would have already been
- * deployed on the host side.
+ * deployed on the host side. However, if the command
+ * were a pass-through command deal with it appropriately.
*/
- if (vm_srb->srb_status == SRB_STATUS_ERROR)
- scmnd->result = DID_TARGET_FAILURE << 16;
- else
- scmnd->result = vm_srb->scsi_status;
+ scmnd->result = vm_srb->scsi_status;
+
+ if (vm_srb->srb_status == SRB_STATUS_ERROR) {
+ switch (scmnd->cmnd[0]) {
+ case ATA_16:
+ case ATA_12:
+ set_host_byte(scmnd, DID_PASSTHROUGH);
+ break;
+ default:
+ set_host_byte(scmnd, DID_TARGET_FAILURE);
+ }
+ }
+
/*
* If the LUN is invalid; remove the device.