ath5k: fix race condition in tx desc processing

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As pointed out by Benoit Papillault, there is a potential
race condition between the host and the hardware in reading
the next link in the transmit descriptor list:

cpu0              hw
                  tx for buf completed
                  raise tx_ok interrupt
process buf
buf->ds_link = 0
                  read buf->ds_link

This change checks txdp before processing a descriptor
(if there are any subsequent descriptors) to see if
hardware moved on.  We'll then process this descriptor on
the next tasklet.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

...

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Bob Copeland 2010-04-07 23:55:58 -04:00 • committed by John W. Linville

parent 6b5d117edd

commit a05988bbbe

1 changed files with 11 additions and 0 deletions

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11

drivers/net/wireless/ath/ath5k/base.c

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