rt2x00usb: mark device removed when get ENOENT usb error

ENOENT usb error mean "specified interface or endpoint does not exist or is not enabled". Mark device not present when we encounter this error similar like we do with ENODEV error.

Otherwise we can have infinite loop in rt2x00usb_work_rxdone(), because we remove and put again RX entries to the queue infinitely.

We can have similar situation when submit urb will fail all the time with other error, so we need consider to limit number of entries processed by rxdone work. But for now, since the patch fixes reproducible soft lockup issue on single processor systems and taken ENOENT error meaning, let apply this fix.

Patch adds additional ENOENT check not only in rx kick routine, but also on other places where we check for ENODEV error.

Reported-by Richard Genoud <[email protected]>

Debugged-by Richard Genoud <[email protected]>

Cc [email protected]

Signed-off-by Stanislaw Gruszka <[email protected]>

---
 drivers/net/wireless/ralink/rt2x00/rt2x00usb.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

drivers/net/wireless/ralink/rt2x00/rt2x00usb.c +3 -3

index e2f4f5778267..086aad22743d 100644
@@ -57,7 +57,7 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 		if (status >= 0)
 			return 0;
 
-		if (status == -ENODEV) {
+		if (status == -ENODEV || status == -ENOENT) {
 			/* Device has disappeared. */
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 			break;

@@ -321,7 +321,7 @@ static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 
 	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 	if (status) {
-		if (status == -ENODEV)
+		if (status == -ENODEV || status == -ENOENT)
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 		rt2x00lib_dmadone(entry);

@@ -410,7 +410,7 @@ static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 
 	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 	if (status) {
-		if (status == -ENODEV)
+		if (status == -ENODEV || status == -ENOENT)
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 		rt2x00lib_dmadone(entry);

ENOENT usb error mean "specified interface or endpoint does not exist or is not enabled". Mark device not present when we encounter this error similar like we do with ENODEV error.

Otherwise we can have infinite loop in rt2x00usb_work_rxdone(), because we remove and put again RX entries to the queue infinitely.

We can have similar situation when submit urb will fail all the time with other error, so we need consider to limit number of entries processed by rxdone work. But for now, since the patch fixes reproducible soft lockup issue on single processor systems and taken ENOENT error meaning, let apply this fix.

Patch adds additional ENOENT check not only in rx kick routine, but also on other places where we check for ENODEV error.

Reported-by Richard Genoud <[email protected]>

Debugged-by Richard Genoud <[email protected]>

Cc [email protected]

Signed-off-by Stanislaw Gruszka <[email protected]>

Tested-by Richard Genoud <[email protected]>