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[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>
This commit is contained in:
K. Y. Srinivasan 2012-04-05 12:26:52 -07:00 committed by James Bottomley
parent c62eef0d1b
commit 42e22cac4e
1 changed files with 15 additions and 5 deletions
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20
drivers/scsi/storvsc_drv.c
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@ -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.