Some devices send response IUs when you'd expect a sense IU.
As a response to a wrong LUN that is within spec.
We cannot get away without handling for response IUs.
This version fixes the issues Hans raised.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
---
drivers/usb/storage/uas.c | 36 ++++++++++++++++++++++++++++++------
1 file changed, 30 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 9ff9404..1fc3813 100644
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -246,6 +246,29 @@ static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
}
}
+static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
+{
+ u8 response_code = riu->response_code;
+
+ switch(response_code) {
+ case RC_INCORRECT_LUN:
+ cmnd->result = DID_BAD_TARGET << 16;
+ break;
+ case RC_TMF_SUCCEEDED:
+ cmnd->result = DID_OK << 16;
+ break;
+ case RC_TMF_NOT_SUPPORTED:
+ cmnd->result = DID_TARGET_FAILURE << 16;
+ break;
+ default:
+ uas_log_cmd_state(cmnd, "response iu", response_code);
+ cmnd->result = DID_ERROR << 16;
+ break;
+ }
+
+ return response_code == RC_TMF_SUCCEEDED;
+}
+
static void uas_stat_cmplt(struct urb *urb)
{
struct iu *iu = urb->transfer_buffer;
@@ -258,6 +281,7 @@ static void uas_stat_cmplt(struct urb *urb)
unsigned long flags;
unsigned int idx;
int status = urb->status;
+ bool success;
spin_lock_irqsave(&devinfo->lock, flags);
@@ -313,13 +337,13 @@ static void uas_stat_cmplt(struct urb *urb)
uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
break;
case IU_ID_RESPONSE:
- uas_log_cmd_state(cmnd, "unexpected response iu",
- ((struct response_iu *)iu)->response_code);
- /* Error, cancel data transfers */
- data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
- data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
cmdinfo->state &= ~COMMAND_INFLIGHT;
- cmnd->result = DID_ERROR << 16;
+ success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
+ if (!success) {
+ /* Error, cancel data transfers */
+ data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
+ data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
+ }
uas_try_complete(cmnd, __func__);
break;
default:
--
2.1.4
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