ath9k: Handle -ENOMEM on RX gracefully

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We would get an oops on RX on -ENOMEM by passing
NULL to the hardware on ath_rx_buf_link(). The oops
would look something like this:

ath_rx_tasklet+0x515/0x53b
ath9k_tasklet+0x48
tasklet_action
__do_softirq
irq_exit
do_IRQ

RIP: ath_rx_buf_link+0x3a

We correct this by handling the requeue directly on
the ath_rx_tasklet() and trying to allocate an skb
*prior* to sending up the last hardware processed
skb. If we run out of memory this gauranteees we have
skbs to work with while it simply drops new received
frames.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

...

This commit is contained in:

Luis R. Rodriguez 2008-11-21 17:41:33 -08:00 • committed by John W. Linville

parent 24689c8590

commit cb71d9bafb

1 changed files with 26 additions and 31 deletions

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57

drivers/net/wireless/ath9k/recv.c

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