5.4-stable review patch. If anyone has any objections, please let me know.
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From: Jonathan Marek jonathan@marek.ca
[ Upstream commit 06c59d97f63c1b8af521fa5aef8a716fb988b285 ]
The name len field of the CMD_OPEN packet is only 16-bits and the upper 16-bits of "param2" are a different "prio" field, which can be nonzero in certain situations, and CMD_OPEN packets can be unexpectedly dropped because of this.
Fix this by masking out the upper 16 bits of param2.
Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver") Signed-off-by: Jonathan Marek jonathan@marek.ca Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20241007235935.6216-1-jonathan@marek.ca Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rpmsg/qcom_glink_native.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 4766c21f96901..47ffaca8d86b5 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1045,7 +1045,8 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data) qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); break; case GLINK_CMD_OPEN: - ret = qcom_glink_rx_defer(glink, param2); + /* upper 16 bits of param2 are the "prio" field */ + ret = qcom_glink_rx_defer(glink, param2 & 0xffff); break; case GLINK_CMD_TX_DATA: case GLINK_CMD_TX_DATA_CONT: