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| author | Aaro Koskinen <aaro.koskinen@iki.fi> | 2015-03-22 17:38:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-24 13:47:13 +0100 |
| commit | f3b8edc0f366bd7049eafa11d0c0187f039c0528 (patch) | |
| tree | 8a425832928d80a360b0205b45b40839b9731979 /drivers/staging/octeon-usb | |
| parent | eb04114f37eb434b5bc18293274420d2a664adc2 (diff) | |
| download | linux-f3b8edc0f366bd7049eafa11d0c0187f039c0528.tar.gz linux-f3b8edc0f366bd7049eafa11d0c0187f039c0528.tar.bz2 linux-f3b8edc0f366bd7049eafa11d0c0187f039c0528.zip | |
staging: octeon-usb: fail and warn if DMA counters are wrong
Fail and WARN if DMA counters are wrong.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/octeon-usb')
| -rw-r--r-- | drivers/staging/octeon-usb/octeon-hcd.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c index 84640454ba71..27acab217d21 100644 --- a/drivers/staging/octeon-usb/octeon-hcd.c +++ b/drivers/staging/octeon-usb/octeon-hcd.c @@ -2617,6 +2617,17 @@ static int cvmx_usb_poll_channel(struct cvmx_usb_state *usb, int channel) (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT)) pipe->flags |= CVMX_USB_PIPE_FLAGS_NEED_PING; + if (unlikely(WARN_ON_ONCE(bytes_this_transfer < 0))) { + /* + * In some rare cases the DMA engine seems to get stuck and + * keeps substracting same byte count over and over again. In + * such case we just need to fail every transaction. + */ + cvmx_usb_perform_complete(usb, pipe, transaction, + CVMX_USB_COMPLETE_ERROR); + return 0; + } + if (usbc_hcint.s.stall) { /* * STALL as a response means this transaction cannot be |