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uas: improve error handling

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(1) Handle data pipe errors: When the data urb failed we
    didn't transfer anything, update scsi_cmnd accordingly.
(2) Cancel data transfers when we got back an error on the
    status pipe.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gerd Hoffmann 2012-06-19 09:54:52 +02:00 committed by Greg Kroah-Hartman
parent b1d6769333
commit 8aac863e92
1 changed files with 13 additions and 1 deletions
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14
drivers/usb/storage/uas.c
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@ -242,6 +242,13 @@ static void uas_stat_cmplt(struct urb *urb)
uas_sense_old(urb, cmnd);
else
uas_sense(urb, cmnd);
if (cmnd->result != 0) {
/* cancel data transfers on error */
if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
usb_unlink_urb(cmdinfo->data_in_urb);
if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
usb_unlink_urb(cmdinfo->data_out_urb);
}
cmdinfo->state &= ~COMMAND_INFLIGHT;
uas_try_complete(cmnd, __func__);
break;
@ -272,7 +279,12 @@ static void uas_data_cmplt(struct urb *urb)
cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
}
BUG_ON(sdb == NULL);
sdb->resid = sdb->length - urb->actual_length;
if (urb->status) {
/* error: no data transfered */
sdb->resid = sdb->length;
} else {
sdb->resid = sdb->length - urb->actual_length;
}
uas_try_complete(cmnd, __func__);
}