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Date: Fri, 21 Feb 2020 08:37:47 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, Thierry Reding <thierry.reding@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.4 068/344] pwm: omap-dmtimer: Simplify error handling From: Uwe Kleine-König <u.kleine-koenig@...gutronix.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@...gutronix.de> Signed-off-by: Thierry Reding <thierry.reding@...il.com> Signed-off-by: Sasha Levin <sashal@...nel.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 00772fc534906..6cfeb0e1cc679 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -298,15 +298,10 @@ 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; @@ -339,13 +334,28 @@ put: 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) -- 2.20.1
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