[PATCH 4.14 152/496] clocksource/drivers/fsl_ftm_timer: Fix error return checking

From: Greg Kroah-Hartman
Date: Mon May 28 2018 - 06:48:13 EST


4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

[ Upstream commit f287eb9013ccf199cbfa4eabd80c36fedfc15a73 ]

The error checks on freq for a negative error return always fails because
freq is unsigned and can never be negative. Fix this by making freq a
signed long.

Detected with Coccinelle:
drivers/clocksource/fsl_ftm_timer.c:287:5-9: WARNING: Unsigned expression
compared with zero: freq <= 0
drivers/clocksource/fsl_ftm_timer.c:291:5-9: WARNING: Unsigned expression
compared with zero: freq <= 0

Fixes: 2529c3a33079 ("clocksource: Add Freescale FlexTimer Module (FTM) timer support")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: kernel-janitors@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20180226113614.3092-1-colin.king@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/fsl_ftm_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/clocksource/fsl_ftm_timer.c
+++ b/drivers/clocksource/fsl_ftm_timer.c
@@ -281,7 +281,7 @@ static int __init __ftm_clk_init(struct

static unsigned long __init ftm_clk_init(struct device_node *np)
{
- unsigned long freq;
+ long freq;

freq = __ftm_clk_init(np, "ftm-evt-counter-en", "ftm-evt");
if (freq <= 0)