From: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
Date: Mon, 13 Nov 2017 16:27:02 +0100
> The mvneta controller provides a 8-bit register to update the pending
> Tx descriptor counter. Then, a maximum of 255 Tx descriptors can be
> added at once. In the current code the mvneta_txq_pend_desc_add function
> assumes the caller takes care of this limit. But it is not the case. In
> some situations (xmit_more flag), more than 255 descriptors are added.
> When this happens, the Tx descriptor counter register is updated with a
> wrong value, which breaks the whole Tx queue management.
>
> This patch fixes the issue by allowing the mvneta_txq_pend_desc_add
> function to process more than 255 Tx descriptors.
>
> Fixes: 2a90f7e1d5d0 ("net: mvneta: add xmit_more support")
> Cc: stable@xxxxxxxxxxxxxxx # 4.11+
> Signed-off-by: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
Applied.