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scsi: storvsc: properly set residual data length on errors

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On I/O errors, the Windows driver doesn't set data_transfer_length
on error conditions other than SRB_STATUS_DATA_OVERRUN.
In these cases we need to set data_transfer_length to 0,
indicating there is no data transferred. On SRB_STATUS_DATA_OVERRUN,
data_transfer_length is set by the Windows driver to the actual data transferred.

Reported-by: Shiva Krishna <Shiva.Krishna@nimblestorage.com>
Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Long Li 2016-12-14 18:46:03 -08:00 committed by Martin K. Petersen
parent bba5dc332e
commit 40630f4628
1 changed files with 13 additions and 3 deletions
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16
drivers/scsi/storvsc_drv.c
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@ -377,6 +377,7 @@ enum storvsc_request_type {
#define SRB_STATUS_SUCCESS 0x01
#define SRB_STATUS_ABORTED 0x02
#define SRB_STATUS_ERROR 0x04
#define SRB_STATUS_DATA_OVERRUN 0x12
#define SRB_STATUS(status) \
(status & ~(SRB_STATUS_AUTOSENSE_VALID | SRB_STATUS_QUEUE_FROZEN))
@ -996,6 +997,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,
struct scsi_cmnd *scmnd = cmd_request->cmd;
struct scsi_sense_hdr sense_hdr;
struct vmscsi_request *vm_srb;
u32 data_transfer_length;
struct Scsi_Host *host;
u32 payload_sz = cmd_request->payload_sz;
void *payload = cmd_request->payload;
@ -1003,6 +1005,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,
host = stor_dev->host;
vm_srb = &cmd_request->vstor_packet.vm_srb;
data_transfer_length = vm_srb->data_transfer_length;
scmnd->result = vm_srb->scsi_status;
@ -1016,13 +1019,20 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request,
&sense_hdr);
}
if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
if (vm_srb->srb_status != SRB_STATUS_SUCCESS) {
storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
sense_hdr.ascq);
/*
* The Windows driver set data_transfer_length on
* SRB_STATUS_DATA_OVERRUN. On other errors, this value
* is untouched. In these cases we set it to 0.
*/
if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN)
data_transfer_length = 0;
}
scsi_set_resid(scmnd,
cmd_request->payload->range.len -
vm_srb->data_transfer_length);
cmd_request->payload->range.len - data_transfer_length);
scmnd->scsi_done(scmnd);