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path: root/drivers/scsi/sd.c
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Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index de6c603..829cc37 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1434,6 +1434,8 @@ static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
#error RC16_LEN must not be more than SD_BUF_SIZE
#endif
+#define READ_CAPACITY_RETRIES_ON_RESET 10
+
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
unsigned char *buffer)
{
@@ -1441,7 +1443,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
struct scsi_sense_hdr sshdr;
int sense_valid = 0;
int the_result;
- int retries = 3;
+ int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
unsigned int alignment;
unsigned long long lba;
unsigned sector_size;
@@ -1470,6 +1472,13 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
* Invalid Field in CDB, just retry
* silently with RC10 */
return -EINVAL;
+ if (sense_valid &&
+ sshdr.sense_key == UNIT_ATTENTION &&
+ sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+ /* Device reset might occur several times,
+ * give it one more chance */
+ if (--reset_retries > 0)
+ continue;
}
retries--;
@@ -1528,7 +1537,7 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
struct scsi_sense_hdr sshdr;
int sense_valid = 0;
int the_result;
- int retries = 3;
+ int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
sector_t lba;
unsigned sector_size;
@@ -1544,8 +1553,16 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
if (media_not_present(sdkp, &sshdr))
return -ENODEV;
- if (the_result)
+ if (the_result) {
sense_valid = scsi_sense_valid(&sshdr);
+ if (sense_valid &&
+ sshdr.sense_key == UNIT_ATTENTION &&
+ sshdr.asc == 0x29 && sshdr.ascq == 0x00)
+ /* Device reset might occur several times,
+ * give it one more chance */
+ if (--reset_retries > 0)
+ continue;
+ }
retries--;
} while (the_result && retries);
@@ -1574,6 +1591,8 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
static int sd_try_rc16_first(struct scsi_device *sdp)
{
+ if (sdp->host->max_cmd_len < 16)
+ return 0;
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
if (scsi_device_protection(sdp))
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