diff options
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/qcom_glink_smem.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c index 7a982c60a8dd..17c885f4ed50 100644 --- a/drivers/rpmsg/qcom_glink_smem.c +++ b/drivers/rpmsg/qcom_glink_smem.c @@ -103,6 +103,13 @@ static void glink_smem_rx_peek(struct qcom_glink_pipe *np, if (tail >= pipe->native.length) tail -= pipe->native.length; + /* + * Order the availability (head) read in glink_smem_rx_avail() + * against the FIFO payload read below, so APPS never consumes + * stale data the remote has not yet published. + */ + rmb(); + len = min_t(size_t, count, pipe->native.length - tail); if (len) memcpy_fromio(data, pipe->fifo + tail, len); |