[PATCH] scsi: core: Fix block I/O error of USB card reader during resume

[Michael Wu]

When accessing storage device via an USB card reader, a block I/O error
occurs during resume:

PM: suspend exit
sd 0: 0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte
=0x08
sd 0: 0:0:0: [sda] tag#0 Sense Key : 0x6 [current]
sd 0: 0:0:0: [sda] tag#0 ASC=0x28 ASCQ=0x0
sd 0: 0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 17 ce e1 00 00 f0 00
blk_update_request: I/O error, dev sda, sector 1560289 op 0x0:(READ) flags
0x84700 phys_seg 19 prio class 0
sd 0: 0:0:0: [sda] tag#0 device offline or changed

Fix it by changing the action in scsi_io_completion_action() from
ACTION_FAIL to ACTION_RETRY by adding the condition `cmd->device->
lockable`.

Signed-off-by: Michael Wu <michael@xxxxxxxxxxxxxxxxx>
---
 drivers/scsi/scsi_lib.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4dbd29ab1dcc..4bc480721947 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -704,7 +704,8 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
 	} else if (sense_valid && sense_current) {
 		switch (sshdr.sense_key) {
 		case UNIT_ATTENTION:
-			if (cmd->device->removable) {
+			if (cmd->device->removable &&
+			    cmd->device->lockable) {
 				/* Detected disc change.  Set a bit
 				 * and quietly refuse further access.
 				 */
-- 
2.29.0