From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Lew Subject: [PATCH] rpmsg: glink: Set tail pointer to 0 at end of FIFO Date: Wed, 27 Jun 2018 18:19:57 -0700 Message-ID: <1530148797-31904-1-git-send-email-clew@codeaurora.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: bjorn.andersson@linaro.org, andy.gross@linaro.org, david.brown@linaro.org Cc: aneela@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-kernel@vger.kernel.org, clew@codeaurora.org List-Id: linux-arm-msm@vger.kernel.org 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. Signed-off-by: Chris Lew --- drivers/rpmsg/qcom_glink_smem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c index 2b5cf2790954..7a276be598d6 100644 --- a/drivers/rpmsg/qcom_glink_smem.c +++ b/drivers/rpmsg/qcom_glink_smem.c @@ -109,7 +109,7 @@ 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); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project