If the clock tu->ick was not enabled in tahvo_usb_probe, it may still hold a non-error pointer, potentially causing the clock to be incorrectly disabled later in the function.
Use the devm_clk_get_enabled helper function to ensure proper call balance for tu->ick.
Found by Linux Verification Center (linuxtesting.org) with Klever.
Fixes: 9ba96ae5074c ("usb: omap1: Tahvo USB transceiver driver") Cc: stable@vger.kernel.org Signed-off-by: Vitalii Mordan mordan@ispras.ru --- v2: Corrected a typo in the error handling of the devm_clk_get_enabled call. This issue was reported by Dan Carpenter dan.carpenter@linaro.org. drivers/usb/phy/phy-tahvo.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/phy/phy-tahvo.c b/drivers/usb/phy/phy-tahvo.c index ae7bf3ff89ee..4182e86dc450 100644 --- a/drivers/usb/phy/phy-tahvo.c +++ b/drivers/usb/phy/phy-tahvo.c @@ -341,9 +341,11 @@ static int tahvo_usb_probe(struct platform_device *pdev)
mutex_init(&tu->serialize);
- tu->ick = devm_clk_get(&pdev->dev, "usb_l4_ick"); - if (!IS_ERR(tu->ick)) - clk_enable(tu->ick); + tu->ick = devm_clk_get_enabled(&pdev->dev, "usb_l4_ick"); + if (IS_ERR(tu->ick)) { + dev_err(&pdev->dev, "failed to get and enable clock\n"); + return PTR_ERR(tu->ick); + }
/* * Set initial state, so that we generate kevents only on state changes. @@ -353,15 +355,14 @@ static int tahvo_usb_probe(struct platform_device *pdev) tu->extcon = devm_extcon_dev_allocate(&pdev->dev, tahvo_cable); if (IS_ERR(tu->extcon)) { dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); - ret = PTR_ERR(tu->extcon); - goto err_disable_clk; + return PTR_ERR(tu->extcon); }
ret = devm_extcon_dev_register(&pdev->dev, tu->extcon); if (ret) { dev_err(&pdev->dev, "could not register extcon device: %d\n", ret); - goto err_disable_clk; + return ret; }
/* Set the initial cable state. */ @@ -384,7 +385,7 @@ static int tahvo_usb_probe(struct platform_device *pdev) if (ret < 0) { dev_err(&pdev->dev, "cannot register USB transceiver: %d\n", ret); - goto err_disable_clk; + return ret; }
dev_set_drvdata(&pdev->dev, tu); @@ -405,9 +406,6 @@ static int tahvo_usb_probe(struct platform_device *pdev)
err_remove_phy: usb_remove_phy(&tu->phy); -err_disable_clk: - if (!IS_ERR(tu->ick)) - clk_disable(tu->ick);
return ret; } @@ -418,8 +416,6 @@ static void tahvo_usb_remove(struct platform_device *pdev)
free_irq(tu->irq, tu); usb_remove_phy(&tu->phy); - if (!IS_ERR(tu->ick)) - clk_disable(tu->ick); }
static struct platform_driver tahvo_usb_driver = {