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rpmsg: glink: Set tail pointer to 0 at end of FIFO 

commit 4623e8bf1d upstream.

When wrapping around the FIFO, the remote expects the tail pointer to
be reset to 0 on the edge case where the tail equals the FIFO length.

Fixes: caf989c350 ("rpmsg: glink: Introduce glink smem based transport")
Cc: stable@vger.kernel.org
Signed-off-by: Chris Lew <clew@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Chris Lew 2018-06-27 18:19:57 -07:00 committed by Greg Kroah-Hartman
parent bae1e47136
commit 06e60a45a4
1 changed files with 1 additions and 1 deletions
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2
drivers/rpmsg/qcom_glink_smem.c
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@ -105,7 +105,7 @@ static void glink_smem_rx_advance(struct qcom_glink_pipe *np,
tail = le32_to_cpu(*pipe->tail);
tail += count;
if (tail > pipe->native.length)
if (tail >= pipe->native.length)
tail -= pipe->native.length;
*pipe->tail = cpu_to_le32(tail);