[SCSI] isci: fix sata response handling

A bug (likely copy/paste) that has been carried from the original
implementation.  The unsolicited frame handling structure returns the
d2h fis in the isci_request.stp.rsp buffer.

Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index a46e07a..b4cf998 100644 (file)
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -2399,22 +2399,19 @@ static void isci_task_save_for_upper_layer_completion(
        }
 }
 
-static void isci_request_process_stp_response(struct sas_task *task,
-                                             void *response_buffer)
+static void isci_process_stp_response(struct sas_task *task, struct dev_to_host_fis *fis)
 {
-       struct dev_to_host_fis *d2h_reg_fis = response_buffer;
        struct task_status_struct *ts = &task->task_status;
        struct ata_task_resp *resp = (void *)&ts->buf[0];
 
-       resp->frame_len = le16_to_cpu(*(__le16 *)(response_buffer + 6));
-       memcpy(&resp->ending_fis[0], response_buffer + 16, 24);
+       resp->frame_len = sizeof(*fis);
+       memcpy(resp->ending_fis, fis, sizeof(*fis));
        ts->buf_valid_size = sizeof(*resp);
 
-       /**
-        * If the device fault bit is set in the status register, then
+       /* If the device fault bit is set in the status register, then
         * set the sense data and return.
         */
-       if (d2h_reg_fis->status & ATA_DF)
+       if (fis->status & ATA_DF)
                ts->stat = SAS_PROTO_RESPONSE;
        else
                ts->stat = SAM_STAT_GOOD;
@@ -2428,7 +2425,6 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
 {
        struct sas_task *task = isci_request_access_task(request);
        struct ssp_response_iu *resp_iu;
-       void *resp_buf;
        unsigned long task_flags;
        struct isci_remote_device *idev = isci_lookup_device(task->dev);
        enum service_response response       = SAS_TASK_UNDELIVERED;
@@ -2565,9 +2561,7 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
                                task);
 
                        if (sas_protocol_ata(task->task_proto)) {
-                               resp_buf = &request->stp.rsp;
-                               isci_request_process_stp_response(task,
-                                                                 resp_buf);
+                               isci_process_stp_response(task, &request->stp.rsp);
                        } else if (SAS_PROTOCOL_SSP == task->task_proto) {
 
                                /* crack the iu response buffer. */