From: Uwe Kleine-König u.kleine-koenig@pengutronix.de
[ Upstream commit c4cf7aa57eb83b108d2d9c6c37c143388fee2a4d ]
Instead of doing error handling in the middle of ->probe(), move error handling and freeing the reference to timer to the end.
This fixes a resource leak as dm_timer wasn't freed when allocating *omap failed.
Implementation note: The put: label was never reached without a goto and ret being unequal to 0, so the removed return statement is fine.
Fixes: 6604c6556db9 ("pwm: Add PWM driver for OMAP using dual-mode timers") Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Signed-off-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pwm/pwm-omap-dmtimer.c | 28 +++++++++++++++++++--------- 1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index f45798679e3c0..2d585c101d52e 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -301,15 +301,10 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) goto put; }
-put: - of_node_put(timer); - if (ret < 0) - return ret; - omap = devm_kzalloc(&pdev->dev, sizeof(*omap), GFP_KERNEL); if (!omap) { - pdata->free(dm_timer); - return -ENOMEM; + ret = -ENOMEM; + goto err_alloc_omap; }
omap->pdata = pdata; @@ -342,13 +337,28 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) ret = pwmchip_add(&omap->chip); if (ret < 0) { dev_err(&pdev->dev, "failed to register PWM\n"); - omap->pdata->free(omap->dm_timer); - return ret; + goto err_pwmchip_add; }
+ of_node_put(timer); + platform_set_drvdata(pdev, omap);
return 0; + +err_pwmchip_add: + + /* + * *omap is allocated using devm_kzalloc, + * so no free necessary here + */ +err_alloc_omap: + + pdata->free(dm_timer); +put: + of_node_put(timer); + + return ret; }
static int pwm_omap_dmtimer_remove(struct platform_device *pdev)