diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2016-03-02 23:57:09 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-03-23 17:11:29 +0100 |
| commit | 0e47b5981a30e856c9c4aba785890528486d1594 (patch) | |
| tree | 346bdb50ebdc9bbfc02a93ed2a18012f2b73e10d /drivers/pwm | |
| parent | bea307c16a3a297f87c7ab9a54de686da2afbad5 (diff) | |
| download | lwn-0e47b5981a30e856c9c4aba785890528486d1594.tar.gz lwn-0e47b5981a30e856c9c4aba785890528486d1594.zip | |
pwm: lpc18xx-sct: Test clock rate to avoid division by 0
The clk API may return 0 on clk_get_rate(), so we should check the
result before using it as a divisor.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-lpc18xx-sct.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-lpc18xx-sct.c b/drivers/pwm/pwm-lpc18xx-sct.c index 9163085101bc..9861fed4e67d 100644 --- a/drivers/pwm/pwm-lpc18xx-sct.c +++ b/drivers/pwm/pwm-lpc18xx-sct.c @@ -360,6 +360,11 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev) } lpc18xx_pwm->clk_rate = clk_get_rate(lpc18xx_pwm->pwm_clk); + if (!lpc18xx_pwm->clk_rate) { + dev_err(&pdev->dev, "pwm clock has no frequency\n"); + ret = -EINVAL; + goto disable_pwmclk; + } mutex_init(&lpc18xx_pwm->res_lock); mutex_init(&lpc18xx_pwm->period_lock); |