linux-kernel - [PATCH] usb: ehci-orion: Handle errors of clk_prepare

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Message-Id: <20210825170902.11234-1-novikov@ispras.ru>
Date:   Wed, 25 Aug 2021 20:09:02 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Lunn <andrew@...n.ch>,
        Mike Turquette <mturquette@...aro.org>,
        Kirill Shilimanov <kirill.shilimanov@...wei.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] usb: ehci-orion: Handle errors of clk_prepare_enable() in probe

ehci_orion_drv_probe() did not account for possible errors of
clk_prepare_enable() that in particular could cause invocation of
clk_disable_unprepare() on clocks that were not prepared/enabled yet,
e.g. in remove or on handling errors of usb_add_hcd() in probe. Though,
there were several patches fixing different issues with clocks in this
driver, they did not solve this problem.

Add handling of errors of clk_prepare_enable() in ehci_orion_drv_probe()
to avoid calls of clk_disable_unprepare() without previous successful
invocation of clk_prepare_enable().

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 8c869edaee07 ("ARM: Orion: EHCI: Add support for enabling clocks")
Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
Co-developed-by: Kirill Shilimanov <kirill.shilimanov@...wei.com>
Signed-off-by: Kirill Shilimanov <kirill.shilimanov@...wei.com>
---
 drivers/usb/host/ehci-orion.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index a319b1df3011..3626758b3e2a 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -264,8 +264,11 @@ static int ehci_orion_drv_probe(struct platform_device *pdev)
 	 * the clock does not exists.
 	 */
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (!IS_ERR(priv->clk))
-		clk_prepare_enable(priv->clk);
+	if (!IS_ERR(priv->clk)) {
+		err = clk_prepare_enable(priv->clk);
+		if (err)
+			goto err_put_hcd;
+	}
 
 	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 	if (IS_ERR(priv->phy)) {
@@ -311,6 +314,7 @@ static int ehci_orion_drv_probe(struct platform_device *pdev)
 err_dis_clk:
 	if (!IS_ERR(priv->clk))
 		clk_disable_unprepare(priv->clk);
+err_put_hcd:
 	usb_put_hcd(hcd);
 err:
 	dev_err(&pdev->dev, "init %s fail, %d\n",
-- 
2.26.2