diff options
| author | Ben Dooks <ben-linux@fluff.org> | 2008-07-01 13:18:27 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-07-03 12:25:07 (GMT) |
| commit | 43bda1a6d218744382547a2f8be3240d1c3a151b (patch) | |
| tree | 7a765e743a6e2cfde5db08dfe073a412e42df873 | |
| parent | 3b73125af69f93972625f4b655675f42ca4274eb (diff) | |
| download | linux-43bda1a6d218744382547a2f8be3240d1c3a151b.tar.xz | |
[ARM] 5141/1: PWM: pwm_request() should return an PTR_ERR() instead of NULL.
Make the return of pwm_request() be more informative than just
being NULL on error by using PTR_ERR() to respond with an
approriate error.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/mach-pxa/pwm.c | 16 | ||||
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 4 |
2 files changed, 13 insertions, 7 deletions
diff --git a/arch/arm/mach-pxa/pwm.c b/arch/arm/mach-pxa/pwm.c index 7c86dd1..ce28cd9 100644 --- a/arch/arm/mach-pxa/pwm.c +++ b/arch/arm/mach-pxa/pwm.c @@ -119,17 +119,23 @@ struct pwm_device *pwm_request(int pwm_id, const char *label) mutex_lock(&pwm_lock); list_for_each_entry(pwm, &pwm_list, node) { - if (pwm->pwm_id == pwm_id && pwm->use_count == 0) { - pwm->use_count++; - pwm->label = label; + if (pwm->pwm_id == pwm_id) { found = 1; break; } } - mutex_unlock(&pwm_lock); + if (found) { + if (pwm->use_count == 0) { + pwm->use_count++; + pwm->label = label; + } else + pwm = ERR_PTR(-EBUSY); + } else + pwm = ERR_PTR(-ENOENT); - return (found) ? pwm : NULL; + mutex_unlock(&pwm_lock); + return pwm; } EXPORT_SYMBOL(pwm_request); diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 8346dfc..6338d0e 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -87,9 +87,9 @@ static int pwm_backlight_probe(struct platform_device *pdev) pb->notify = data->notify; pb->pwm = pwm_request(data->pwm_id, "backlight"); - if (pb->pwm == NULL) { + if (IS_ERR(pb->pwm)) { dev_err(&pdev->dev, "unable to request PWM for backlight\n"); - ret = -EBUSY; + ret = PTR_ERR(pb->pwm); goto err_pwm; } |