1 files changed, 34 insertions, 15 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 303d7656f710..28966d05435c 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>
+#include <linux/blkdev.h>
 #include <asm/semaphore.h>
 #include <scsi/scsi.h>
 #include "scsi_priv.h"
@@ -41,6 +42,11 @@
 
 #define SPI_MAX_ECHO_BUFFER_SIZE	4096
 
+#define DV_LOOPS	3
+#define DV_TIMEOUT	(10*HZ)
+#define DV_RETRIES	3	/* should only need at most 
+				 * two cc/ua clears */
+
 /* Private data accessors (keep these out of the header file) */
 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
 #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
@@ -100,6 +106,29 @@ static int sprint_frac(char *dest, int value, int denom)
 	return result;
 }
 
+/* Modification of scsi_wait_req that will clear UNIT ATTENTION conditions
+ * resulting from (likely) bus and device resets */
+static void spi_wait_req(struct scsi_request *sreq, const void *cmd,
+			 void *buffer, unsigned bufflen)
+{
+	int i;
+
+	for(i = 0; i < DV_RETRIES; i++) {
+		sreq->sr_request->flags |= REQ_FAILFAST;
+
+		scsi_wait_req(sreq, cmd, buffer, bufflen,
+			      DV_TIMEOUT, /* retries */ 1);
+		if (sreq->sr_result & DRIVER_SENSE) {
+			struct scsi_sense_hdr sshdr;
+
+			if (scsi_request_normalize_sense(sreq, &sshdr)
+			    && sshdr.sense_key == UNIT_ATTENTION)
+				continue;
+		}
+		break;
+	}
+}
+
 static struct {
 	enum spi_signal_type	value;
 	char			*name;
@@ -378,11 +407,6 @@ static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
 	if(i->f->set_##x)		\
 		i->f->set_##x(sdev->sdev_target, y)
 
-#define DV_LOOPS	3
-#define DV_TIMEOUT	(10*HZ)
-#define DV_RETRIES	3	/* should only need at most 
-				 * two cc/ua clears */
-
 enum spi_compare_returns {
 	SPI_COMPARE_SUCCESS,
 	SPI_COMPARE_FAILURE,
@@ -446,8 +470,7 @@ spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer,
 	for (r = 0; r < retries; r++) {
 		sreq->sr_cmd_len = 0;	/* wait_req to fill in */
 		sreq->sr_data_direction = DMA_TO_DEVICE;
-		scsi_wait_req(sreq, spi_write_buffer, buffer, len,
-			      DV_TIMEOUT, DV_RETRIES);
+		spi_wait_req(sreq, spi_write_buffer, buffer, len);
 		if(sreq->sr_result || !scsi_device_online(sdev)) {
 			struct scsi_sense_hdr sshdr;
 
@@ -471,8 +494,7 @@ spi_dv_device_echo_buffer(struct scsi_request *sreq, u8 *buffer,
 		memset(ptr, 0, len);
 		sreq->sr_cmd_len = 0;	/* wait_req to fill in */
 		sreq->sr_data_direction = DMA_FROM_DEVICE;
-		scsi_wait_req(sreq, spi_read_buffer, ptr, len,
-			      DV_TIMEOUT, DV_RETRIES);
+		spi_wait_req(sreq, spi_read_buffer, ptr, len);
 		scsi_device_set_state(sdev, SDEV_QUIESCE);
 
 		if (memcmp(buffer, ptr, len) != 0)
@@ -500,8 +522,7 @@ spi_dv_device_compare_inquiry(struct scsi_request *sreq, u8 *buffer,
 
 		memset(ptr, 0, len);
 
-		scsi_wait_req(sreq, spi_inquiry, ptr, len,
-			      DV_TIMEOUT, DV_RETRIES);
+		spi_wait_req(sreq, spi_inquiry, ptr, len);
 		
 		if(sreq->sr_result || !scsi_device_online(sdev)) {
 			scsi_device_set_state(sdev, SDEV_QUIESCE);
@@ -593,8 +614,7 @@ spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer)
 	 * (reservation conflict, device not ready, etc) just
 	 * skip the write tests */
 	for (l = 0; ; l++) {
-		scsi_wait_req(sreq, spi_test_unit_ready, NULL, 0,
-			      DV_TIMEOUT, DV_RETRIES);
+		spi_wait_req(sreq, spi_test_unit_ready, NULL, 0);
 
 		if(sreq->sr_result) {
 			if(l >= 3)
@@ -608,8 +628,7 @@ spi_dv_device_get_echo_buffer(struct scsi_request *sreq, u8 *buffer)
 	sreq->sr_cmd_len = 0;
 	sreq->sr_data_direction = DMA_FROM_DEVICE;
 
-	scsi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4,
-		      DV_TIMEOUT, DV_RETRIES);
+	spi_wait_req(sreq, spi_read_buffer_descriptor, buffer, 4);
 
 	if (sreq->sr_result)
 		/* Device has no echo buffer */