[SCSI] libsas: abstract STP task status into a function

Break out the frame processor for STP tasks from aic94xx so they can
be shared by other SAS HBA's

Original patch from Jeff Garzik <jeff@garzik.org>

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

4 files changed, 44 insertions, 19 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index 663fdef38c52..965d4bb999d9 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -192,24 +192,8 @@ static void asd_get_response_tasklet(struct asd_ascb *ascb,
                         r + 16 + sizeof(struct ssp_frame_hdr);
 
                 ts->residual = le32_to_cpu(*(__le32 *)r);
-                ts->resp = SAS_TASK_COMPLETE;
-                if (iu->datapres == 0)
-                        ts->stat = iu->status;
-                else if (iu->datapres == 1)
-                        ts->stat = iu->resp_data[3];
-                else if (iu->datapres == 2) {
-                        ts->stat = SAM_CHECK_COND;
-                        ts->buf_valid_size = min((u32) SAS_STATUS_BUF_SIZE,
-                                         be32_to_cpu(iu->sense_data_len));
-                        memcpy(ts->buf, iu->sense_data, ts->buf_valid_size);
-                        if (iu->status != SAM_CHECK_COND) {
-                                ASD_DPRINTK("device %llx sent sense data, but "
-                                            "stat(0x%x) is not CHECK_CONDITION"
-                                            "\n",
-                                            SAS_ADDR(task->dev->sas_addr),
-                                            iu->status);
-                        }
-                }
+
+                sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
         }  else {
                 struct ata_task_resp *resp = (void *) &ts->buf[0];
 
diff --git a/drivers/scsi/libsas/Makefile b/drivers/scsi/libsas/Makefile
index 60d6e93dd949..1ad1323c60fa 100644
--- a/drivers/scsi/libsas/Makefile
+++ b/drivers/scsi/libsas/Makefile
@@ -33,6 +33,7 @@ libsas-y +=  sas_init.o     \
                 sas_dump.o     \
                 sas_discover.o \
                 sas_expander.o \
-                sas_scsi_host.o
+                sas_scsi_host.o \
+                sas_task.o
 libsas-$(CONFIG_SCSI_SAS_ATA) +=        sas_ata.o
 libsas-$(CONFIG_SCSI_SAS_HOST_SMP) +=   sas_host_smp.o
\ No newline at end of file
diff --git a/drivers/scsi/libsas/sas_task.c b/drivers/scsi/libsas/sas_task.c
new file mode 100644
index 000000000000..594524d5bfa1
--- /dev/null
+++ b/drivers/scsi/libsas/sas_task.c
@@ -0,0 +1,36 @@
+#include <linux/kernel.h>
+#include <scsi/sas.h>
+#include <scsi/libsas.h>
+
+/* fill task_status_struct based on SSP response frame */
+void sas_ssp_task_response(struct device *dev, struct sas_task *task,
+                           struct ssp_response_iu *iu)
+{
+        struct task_status_struct *tstat = &task->task_status;
+
+        tstat->resp = SAS_TASK_COMPLETE;
+
+        if (iu->datapres == 0)
+                tstat->stat = iu->status;
+        else if (iu->datapres == 1)
+                tstat->stat = iu->resp_data[3];
+        else if (iu->datapres == 2) {
+                tstat->stat = SAM_CHECK_COND;
+                tstat->buf_valid_size =
+                        min_t(int, SAS_STATUS_BUF_SIZE,
+                              be32_to_cpu(iu->sense_data_len));
+                memcpy(tstat->buf, iu->sense_data, tstat->buf_valid_size);
+
+                if (iu->status != SAM_CHECK_COND)
+                        dev_printk(KERN_WARNING, dev,
+                                   "dev %llx sent sense data, but "
+                                   "stat(%x) is not CHECK CONDITION\n",
+                                   SAS_ADDR(task->dev->sas_addr),
+                                   iu->status);
+        }
+        else
+                /* when datapres contains corrupt/unknown value... */
+                tstat->stat = SAM_CHECK_COND;
+}
+EXPORT_SYMBOL_GPL(sas_ssp_task_response);
+
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index a075f130303c..3ffd6b582a97 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -672,4 +672,8 @@ extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
 
 extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
                            struct request *req);
+
+extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
+                                  struct ssp_response_iu *iu);
+
 #endif /* _SASLIB_H_ */