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[PATCH] USB Storage: port reset on transport error

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This patch causes a port reset whenever there's a transport error or abort.
If that fails it reverts back to doing a mass-storage device reset.  It
started life as as497 and was rediffed by me.

This makes error recovery a lot quicker and more reliable.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthew Dharm
2005-06-06 17:21:41 -07:00
committed by Greg Kroah-Hartman
parent 5203ad4413
commit 4d07ef762f
4 changed files with 82 additions and 64 deletions
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99
drivers/usb/storage/transport.c
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@@ -541,15 +541,15 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
*/
if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
US_DEBUGP("-- command was aborted\n");
goto Handle_Abort;
srb->result = DID_ABORT << 16;
goto Handle_Errors;
}
/* if there is a transport error, reset and don't auto-sense */
if (result == USB_STOR_TRANSPORT_ERROR) {
US_DEBUGP("-- transport indicates error, resetting\n");
us->transport_reset(us);
srb->result = DID_ERROR << 16;
return;
goto Handle_Errors;
}
/* if the transport provided its own sense data, don't auto-sense */
@@ -669,7 +669,8 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
US_DEBUGP("-- auto-sense aborted\n");
goto Handle_Abort;
srb->result = DID_ABORT << 16;
goto Handle_Errors;
}
if (temp_result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("-- auto-sense failure\n");
@@ -678,9 +679,9 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
* multi-target device, since failure of an
* auto-sense is perfectly valid
*/
if (!(us->flags & US_FL_SCM_MULT_TARG))
us->transport_reset(us);
srb->result = DID_ERROR << 16;
if (!(us->flags & US_FL_SCM_MULT_TARG))
goto Handle_Errors;
return;
}
@@ -721,12 +722,28 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
return;
/* abort processing: the bulk-only transport requires a reset
* following an abort */
Handle_Abort:
srb->result = DID_ABORT << 16;
if (us->protocol == US_PR_BULK)
/* Error and abort processing: try to resynchronize with the device
* by issuing a port reset. If that fails, try a class-specific
* device reset. */
Handle_Errors:
/* Let the SCSI layer know we are doing a reset, set the
* RESETTING bit, and clear the ABORTING bit so that the reset
* may proceed. */
scsi_lock(us_to_host(us));
usb_stor_report_bus_reset(us);
set_bit(US_FLIDX_RESETTING, &us->flags);
clear_bit(US_FLIDX_ABORTING, &us->flags);
scsi_unlock(us_to_host(us));
result = usb_stor_port_reset(us);
if (result < 0) {
scsi_lock(us_to_host(us));
usb_stor_report_device_reset(us);
scsi_unlock(us_to_host(us));
us->transport_reset(us);
}
clear_bit(US_FLIDX_RESETTING, &us->flags);
}
/* Stop the current URB transfer */
@@ -1134,24 +1151,18 @@ static int usb_stor_reset_common(struct us_data *us,
{
int result;
int result2;
int rc = FAILED;
/* Let the SCSI layer know we are doing a reset, set the
* RESETTING bit, and clear the ABORTING bit so that the reset
* may proceed.
*/
scsi_lock(us_to_host(us));
usb_stor_report_device_reset(us);
set_bit(US_FLIDX_RESETTING, &us->flags);
clear_bit(US_FLIDX_ABORTING, &us->flags);
scsi_unlock(us_to_host(us));
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
US_DEBUGP("No reset during disconnect\n");
return -EIO;
}
result = usb_stor_control_msg(us, us->send_ctrl_pipe,
request, requesttype, value, index, data, size,
5*HZ);
if (result < 0) {
US_DEBUGP("Soft reset failed: %d\n", result);
goto Done;
return result;
}
/* Give the device some time to recover from the reset,
@@ -1161,7 +1172,7 @@ static int usb_stor_reset_common(struct us_data *us,
HZ*6);
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
US_DEBUGP("Reset interrupted by disconnect\n");
goto Done;
return -EIO;
}
US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n");
@@ -1173,16 +1184,11 @@ static int usb_stor_reset_common(struct us_data *us,
/* return a result code based on the result of the clear-halts */
if (result >= 0)
result = result2;
if (result < 0) {
if (result < 0)
US_DEBUGP("Soft reset failed\n");
goto Done;
}
US_DEBUGP("Soft reset done\n");
rc = SUCCESS;
Done:
clear_bit(US_FLIDX_RESETTING, &us->flags);
return rc;
else
US_DEBUGP("Soft reset done\n");
return result;
}
/* This issues a CB[I] Reset to the device in question
@@ -1212,3 +1218,32 @@ int usb_stor_Bulk_reset(struct us_data *us)
USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, us->ifnum, NULL, 0);
}
/* Issue a USB port reset to the device. But don't do anything if
* there's more than one interface in the device, so that other users
* are not affected. */
int usb_stor_port_reset(struct us_data *us)
{
int result, rc;
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
result = -EIO;
US_DEBUGP("No reset during disconnect\n");
} else if (us->pusb_dev->actconfig->desc.bNumInterfaces != 1) {
result = -EBUSY;
US_DEBUGP("Refusing to reset a multi-interface device\n");
} else {
result = rc =
usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
if (result < 0) {
US_DEBUGP("unable to lock device for reset: %d\n",
result);
} else {
result = usb_reset_device(us->pusb_dev);
if (rc)
usb_unlock_device(us->pusb_dev);
US_DEBUGP("usb_reset_device returns %d\n", result);
}
}
return result;
}