From: Simon Guinot simon.guinot@sequanux.org 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@vger.kernel.org # 4.11+ Signed-off-by: Simon Guinot simon.guinot@sequanux.org
Applied.