The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 928002a5e9dab2ddc1a0fe3e00739e89be30dc6b Mon Sep 17 00:00:00 2001

From: Arun Kumar Neelakantam aneela@codeaurora.org Date: Wed, 3 Oct 2018 17:08:20 +0530 Subject: [PATCH] rpmsg: glink: smem: Support rx peak for size less than 4 bytes

The current rx peak function fails to read the data if size is less than 4bytes.

Use memcpy_fromio to support data reads of size less than 4 bytes.

Cc: stable@vger.kernel.org Fixes: f0beb4ba9b18 ("rpmsg: glink: Remove chunk size word align warning") Signed-off-by: Arun Kumar Neelakantam aneela@codeaurora.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org

diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c index ab23da3d7131..64a5ce324c7f 100644 --- a/drivers/rpmsg/qcom_glink_smem.c +++ b/drivers/rpmsg/qcom_glink_smem.c @@ -89,15 +89,11 @@ static void glink_smem_rx_peak(struct qcom_glink_pipe *np, tail -= pipe->native.length;

len = min_t(size_t, count, pipe->native.length - tail); - if (len) { - __ioread32_copy(data, pipe->fifo + tail, - len / sizeof(u32)); - } + if (len) + memcpy_fromio(data, pipe->fifo + tail, len);

- if (len != count) { - __ioread32_copy(data + len, pipe->fifo, - (count - len) / sizeof(u32)); - } + if (len != count) + memcpy_fromio(data + len, pipe->fifo, (count - len)); }

static void glink_smem_rx_advance(struct qcom_glink_pipe *np,