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authorStanislaw Gruszka <sgruszka@redhat.com>2012-07-04 13:10:02 +0200
committerJohn W. Linville <linville@tuxdriver.com>2012-07-09 21:01:02 +0200
commitefd821182cec8c92babef6e00a95066d3252fda4 (patch)
treed3f3d2495ef1a7167c72fd74b2d154ea8256aac9 /drivers/net
parentmwifiex: fix Coverity SCAN CID 709078: Resource leak (RESOURCE_LEAK) (diff)
downloadlinux-efd821182cec8c92babef6e00a95066d3252fda4.tar.xz
linux-efd821182cec8c92babef6e00a95066d3252fda4.zip
rt2x00usb: fix indexes ordering on RX queue kick
On rt2x00_dmastart() we increase index specified by Q_INDEX and on rt2x00_dmadone() we increase index specified by Q_INDEX_DONE. So entries between Q_INDEX_DONE and Q_INDEX are those we currently process in the hardware. Entries between Q_INDEX and Q_INDEX_DONE are those we can submit to the hardware. According to that fix rt2x00usb_kick_queue(), as we need to submit RX entries that are not processed by the hardware. It worked before only for empty queue, otherwise was broken. Note that for TX queues indexes ordering are ok. We need to kick entries that have filled skb, but was not submitted to the hardware, i.e. started from Q_INDEX_DONE and have ENTRY_DATA_PENDING bit set. From practical standpoint this fixes RX queue stall, usually reproducible in AP mode, like for example reported here: https://bugzilla.redhat.com/show_bug.cgi?id=828824 Reported-and-tested-by: Franco Miceli <fmiceli@plan.ceibal.edu.uy> Reported-and-tested-by: Tom Horsley <horsley1953@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00usb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index d357d1ed92f6..74ecc33fdd90 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -436,8 +436,8 @@ void rt2x00usb_kick_queue(struct data_queue *queue)
case QID_RX:
if (!rt2x00queue_full(queue))
rt2x00queue_for_each_entry(queue,
- Q_INDEX_DONE,
Q_INDEX,
+ Q_INDEX_DONE,
NULL,
rt2x00usb_kick_rx_entry);
break;