3.16.54-rc1 review patch. If anyone has any objections, please let me know.
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From: Stanislaw Gruszka sgruszka@redhat.com
commit bfa62a52cad93686bb8d8171ea5288813248a7c6 upstream.
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 richard.genoud@gmail.com Debugged-by: Richard Genoud richard.genoud@gmail.com Signed-off-by: Stanislaw Gruszka sgruszka@redhat.com Tested-by: Richard Genoud richard.genoud@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org [bwh: Backported to 3.16: adjust filename, context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/net/wireless/rt2x00/rt2x00usb.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c +++ b/drivers/net/wireless/rt2x00/rt2x00usb.c @@ -62,7 +62,7 @@ int rt2x00usb_vendor_request(struct rt2x * -ENODEV: Device has disappeared, no point continuing. * All other errors: Try again. */ - else if (status == -ENODEV) { + else if (status == -ENODEV || status == -ENOENT) { clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); break; } @@ -325,7 +325,7 @@ static bool rt2x00usb_kick_tx_entry(stru
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); @@ -414,7 +414,7 @@ static bool rt2x00usb_kick_rx_entry(stru
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);