wcn36xx: handle rx skb allocation failure to avoid system crash

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Lawrence reported that git clone could make system crash on a
Qualcomm ARM soc based device (DragonBoard, 1G memory without
swap) running 64bit Debian.

It's turned out the crash is related with rx skb allocation
failure. git could consume more than 600MB anonymous memory.
And system is in extremely memory shortage case.

But driver didn't handle the rx allocation failure case. This patch
doesn't submit skb to upper layer if rx skb allocation fails.
Instead, it reuse the old skb for rx DMA again. It's more like
drop the packets if system is in memory shortage case.

With this change, git clone is OOMed instead of system crash.

Reported-by: King, Lawrence <lking@qti.qualcomm.com>
Signed-off-by: Fengwei Yin <fengwei.yin@linaro.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

...

This commit is contained in:

Fengwei Yin 2015-12-20 21:20:40 +08:00 • committed by Kalle Valo

parent 19f2ce3f11

commit 2ec7752fd9

1 changed files with 22 additions and 21 deletions

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41

drivers/net/wireless/ath/wcn36xx/dxe.c

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