| Message ID | 20241007235935.6216-1-jonathan@marek.ca (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [v2] rpmsg: glink: use only lower 16-bits of param2 for CMD_OPEN name length | expand |
On Mon, Oct 07, 2024 at 07:59:35PM GMT, Jonathan Marek wrote: > 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> > --- > drivers/rpmsg/qcom_glink_native.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 0b2f290069080..b534b88db3f8e 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1204,7 +1204,8 @@ void qcom_glink_native_rx(struct qcom_glink *glink) ret = qcom_glink_rx_open_ack(glink, param1); 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:
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> --- drivers/rpmsg/qcom_glink_native.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)