Out of memory problem with newer firmware

[Rafał Miłecki]

Summary:
1) Chris has ASUS WL500pv2 with OpenWRT
2) This is router with Broadcom 5354 SoC and LP-PHY card
3) Firmware 410.2160 (broadcom-wl-4.150.10.5.tar.bz2) works OK
4) Firmware 478.104 (broadcom-wl-4.178.10.4.tar.bz2) causes OOM

Larry was testing his LP-PHY with kmemleak but didn't find anything.

Chris traced a lot of skbs being allocated before OOM (500+).

I suspect that with new firmware we provide slightly different RX
packets to mac80211 and there is sth wrong with mac80211 causing SKBs
not being freed. I don't have any other idea how changing firmware
could cause out of memory problems.

The alloc code is question is dma.c::~585
skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags);

I've written patch to dump data we provide mac80211. My hope is to
notice differences in that data between older vs. newer firmware.

Chris: could you try attached patch and provide dmesg from older and
newer firmware with this patch applied?

-- 
Rafał
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