On Sun, Nov 02, 2014 at 01:38:47PM +0100, Stanislaw Gruszka wrote: > RT2800 and newer hardware require padding between header and payload if > header length is not multiple of 4. > > For historical reasons we also align payload to to 4 bytes boundary, but > such alignment is not needed on modern H/W. > > Patch improve performance on embedded CPUs and _possibly_ fixes > skb_under_panic problems reported from time to time: > > https://bugzilla.kernel.org/show_bug.cgi?id=84911 > https://bugzilla.kernel.org/show_bug.cgi?id=72471 > http://marc.info/?l=linux-wireless&m=139108549530402&w=2 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1087591 > > But we can not explain or otherwise confirm the patch fixes this panic > issue for sure. Antti on https://bugzilla.kernel.org/show_bug.cgi?id=72471 tested patch and confirm it fixes the panic, he also provided traces showing that we really eat headroom on each retransmission in some special case - no payload and header length not being multiple of 4. Taking that and since this patch was not yet applied I'll repost it with updated changelog and direct to 3.18 stream and -stable. Stanislaw -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
