From: Cristian Marussi cristian.marussi@arm.com
[ Upstream commit bdb8742dc6f7c599c3d61959234fe4c23638727b ]
SCMI message headers carry a sequence number and such field is sized to allow for MSG_TOKEN_MAX distinct numbers; moreover zero is not really an acceptable maximum number of pending in-flight messages.
Fix accordingly the checks performed on the value exported by transports in scmi_desc.max_msg
Link: https://lore.kernel.org/r/20210712141833.6628-3-cristian.marussi@arm.com Reported-by: Vincent Guittot vincent.guittot@linaro.org Signed-off-by: Cristian Marussi cristian.marussi@arm.com [sudeep.holla: updated the patch title and error message] Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/arm_scmi/driver.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 629f57795a9b..551672aecd2c 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -690,8 +690,9 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo) struct scmi_xfers_info *info = &sinfo->tx_minfo;
/* Pre-allocated messages, no more than what hdr.seq can support */ - if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) { - dev_err(dev, "Maximum message of %d exceeds supported %ld\n", + if (WARN_ON(!desc->max_msg || desc->max_msg > MSG_TOKEN_MAX)) { + dev_err(dev, + "Invalid maximum messages %d, not in range [1 - %lu]\n", desc->max_msg, MSG_TOKEN_MAX); return -EINVAL; }