On 01/16/2017 01:45 PM, Simon Horman wrote:
From: Masaru Nagai <masaru.nagai.vx@xxxxxxxxxxx>
Due to alignment requirements of the hardware transmissions are split into
two DMA descriptors, a small padding descriptor of 0 - 3 bytes in length
followed by a descriptor for rest of the packet.
In the case of IP packets the first descriptor will never be zero due to
the way that the stack aligns buffers for IP packets. However, for non-IP
packets it may be zero.
In that case it has been reported that timeouts occur, presumably because
transmission stops at the first zero-length DMA descriptor and thus the
packet is not transmitted. However, in my environment a BUG is triggered as
follows:
[...]
Fixes: 2f45d1902acf ("ravb: minimize TX data copying")
Signed-off-by: Masaru Nagai <masaru.nagai.vx@xxxxxxxxxxx
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Acked-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
MBR, Sergei
