Commit 9d324973 authored Dec 14, 2017 by Bjorn Andersson

rpmsg: glink: smem: Ensure ordering during tx



Ensure the ordering of the fifo write and the update of the write index,
so that the index is not updated before the data has landed in the fifo.

Acked-By: Chris Lew <clew@codeaurora.org>
Reported-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

parent ed608eb0

drivers/rpmsg/qcom_glink_smem.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -183,6 +183,9 @@ static void glink_smem_tx_write(struct qcom_glink_pipe *glink_pipe,
		if (head >= pipe->native.length)
		head -= pipe->native.length;

		/* Ensure ordering of fifo and head update */
		wmb();

		*pipe->head = cpu_to_le32(head);
		}