From: Dan Carpenter dan.carpenter@oracle.com
stable inclusion from linux-4.19.192 commit dcbce0b6f38476b380a0dec28e237d9398ca2bfe
--------------------------------
[ Upstream commit d9cd78edb2e6b7e26747c0ec312be31e7ef196fe ]
How the type promotion works in ternary expressions is a bit tricky. The problem is that scpi_clk_get_val() returns longs, "ret" is a int which holds a negative error code, and le32_to_cpu() is an unsigned int. We want the negative error code to be cast to a negative long. But because le32_to_cpu() is an u32 then "ret" is type promoted to u32 and becomes a high positive and then it is promoted to long and it is still a high positive value.
Fix this by getting rid of the ternary.
Link: https://lore.kernel.org/r/YIE7pdqV/h10tEAK@mwanda Fixes: 8cb7cf56c9fe ("firmware: add support for ARM System Control and Power Interface(SCPI) protocol") Reviewed-by: Cristian Marussi cristian.marussi@arm.com Signed-off-by: Dan Carpenter dan.carpenter@oracle.com [sudeep.holla: changed to return 0 as clock rate on error] Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/firmware/arm_scpi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c index c7d06a36b23a5..baa7280eccb34 100644 --- a/drivers/firmware/arm_scpi.c +++ b/drivers/firmware/arm_scpi.c @@ -563,8 +563,10 @@ static unsigned long scpi_clk_get_val(u16 clk_id)
ret = scpi_send_message(CMD_GET_CLOCK_VALUE, &le_clk_id, sizeof(le_clk_id), &rate, sizeof(rate)); + if (ret) + return 0;
- return ret ? ret : le32_to_cpu(rate); + return le32_to_cpu(rate); }
static int scpi_clk_set_val(u16 clk_id, unsigned long rate)