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rt2x00: rt2800usb: fix status register reread logic 

Another good catch from Jakub Kicinski. This patch fixes my
recent commit: ed61e2b020
"rt2x00: rt2800usb: rework txdone code"

We should reread status register only when nobody else start already
reading status i.e. test_and_set_bit(TX_STATUS_READING, flags) return 0.

Reported-by: Jakub Kicinski <moorray@wp.pl>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2012-03-19 15:59:41 +01:00 committed by John W. Linville
parent b9fc106108
commit 4e808a38fd
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/rt2x00/rt2800usb.c
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@ -184,7 +184,7 @@ static bool rt2800usb_tx_sta_fifo_read_completed(struct rt2x00_dev *rt2x00dev,
* here again if status reading is needed.
*/
if (rt2800usb_txstatus_pending(rt2x00dev) &&
test_and_set_bit(TX_STATUS_READING, &rt2x00dev->flags))
!test_and_set_bit(TX_STATUS_READING, &rt2x00dev->flags))
return true;
else
return false;