On 18-1-2017 0:24, gavinli@xxxxxxxxxxxxxx wrote:
> From: Gavin Li <git@xxxxxxxxxxxxxx>
>
> brcmf_sdio_fromevntchan() was being called on the the data frame
> rather than the software header, causing some frames to be
> mischaracterized as on the event channel rather than the data channel.
>
> This fixes a major performance regression (due to dropped packets).
>
> Fixes: c56caa9db8ab ("brcmfmac: screening firmware event packet")
Actually would prefer Franky to chime in as well as he made the change
and confirm correctness. It was introduced a couple of kernel versions
back and only a performance regression so seems ok to let this go in
4.11 for now and backport as needed for stable later.
Acked-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
> Signed-off-by: Gavin Li <git@xxxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> [4.7+]
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> index dfb0658713d9..d2219885071f 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
> @@ -1661,7 +1661,7 @@ static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
> pfirst->len, pfirst->next,
> pfirst->prev);
> skb_unlink(pfirst, &bus->glom);
> - if (brcmf_sdio_fromevntchan(pfirst->data))
> + if (brcmf_sdio_fromevntchan(&dptr[SDPCM_HWHDR_LEN]))
> brcmf_rx_event(bus->sdiodev->dev, pfirst);
> else
> brcmf_rx_frame(bus->sdiodev->dev, pfirst,
>
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