linux-kernel - [PATCH] usb: ehci-spear: fix call balance of sehci clk handling routines

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Message-Id: <20241114230310.432213-1-mordan@ispras.ru>
Date: Fri, 15 Nov 2024 02:03:10 +0300
From: Vitalii Mordan <mordan@...ras.ru>
To: Alan Stern <stern@...land.harvard.edu>
Cc: Vitalii Mordan <mordan@...ras.ru>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Fedor Pchelkin <pchelkin@...ras.ru>,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Vadim Mutilin <mutilin@...ras.ru>,
	stable@...r.kernel.org
Subject: [PATCH] usb: ehci-spear: fix call balance of sehci clk handling routines

If the clock sehci->clk was not enabled in spear_ehci_hcd_drv_probe,
it should not be disabled in any path.

Conversely, if it was enabled in spear_ehci_hcd_drv_probe, it must be disabled
in all error paths to ensure proper cleanup.

Found by Linux Verification Center (linuxtesting.org) with Klever.

Fixes: 7675d6ba436f ("USB: EHCI: make ehci-spear a separate driver")
Cc: stable@...r.kernel.org
Signed-off-by: Vitalii Mordan <mordan@...ras.ru>
---
 drivers/usb/host/ehci-spear.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index d0e94e4c9fe2..11294f196ee3 100644
--- a/drivers/usb/host/ehci-spear.c
+++ b/drivers/usb/host/ehci-spear.c
@@ -105,7 +105,9 @@ static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
 	/* registers start at offset 0x0 */
 	hcd_to_ehci(hcd)->caps = hcd->regs;
 
-	clk_prepare_enable(sehci->clk);
+	retval = clk_prepare_enable(sehci->clk);
+	if (retval)
+		goto err_put_hcd;
 	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (retval)
 		goto err_stop_ehci;
@@ -130,8 +132,7 @@ static void spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 
 	usb_remove_hcd(hcd);
 
-	if (sehci->clk)
-		clk_disable_unprepare(sehci->clk);
+	clk_disable_unprepare(sehci->clk);
 	usb_put_hcd(hcd);
 }
 
-- 
2.25.1