4.19-stable review patch. If anyone has any objections, please let me know.
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From: Bjorn Andersson quic_bjorande@quicinc.com
commit 7a68f9fa97357a0f2073c9c31ed4101da4fce93e upstream.
As support for splitting transmission over several messages using TX_DATA_CONT was introduced it does not immediately return the return value of qcom_glink_tx().
The result is that in the intentless case (i.e. intent == NULL), the code will continue to send all additional chunks. This is wasteful, and it's possible that the send operation could incorrectly indicate success, if the last chunk fits in the TX fifo.
Fix the condition.
Fixes: 8956927faed3 ("rpmsg: glink: Add TX_DATA_CONT command while sending") Reviewed-by: Chris Lew quic_clew@quicinc.com Signed-off-by: Bjorn Andersson quic_bjorande@quicinc.com Signed-off-by: Bjorn Andersson andersson@kernel.org Link: https://lore.kernel.org/r/20230418163018.785524-2-quic_bjorande@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/rpmsg/qcom_glink_native.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1355,8 +1355,9 @@ static int __qcom_glink_send(struct glin ret = qcom_glink_tx(glink, &req, sizeof(req), data, chunk_size, wait);
/* Mark intent available if we failed */ - if (ret && intent) { - intent->in_use = false; + if (ret) { + if (intent) + intent->in_use = false; return ret; }
@@ -1377,8 +1378,9 @@ static int __qcom_glink_send(struct glin chunk_size, wait);
/* Mark intent available if we failed */ - if (ret && intent) { - intent->in_use = false; + if (ret) { + if (intent) + intent->in_use = false; break; } }