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usb: ehci-spear: fix call balance of sehci clk handling routines

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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: 7675d6ba43 ("USB: EHCI: make ehci-spear a separate driver")
Cc: stable@vger.kernel.org
Signed-off-by: Vitalii Mordan <mordan@ispras.ru>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20241114230310.432213-1-mordan@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitalii Mordan 2024-11-15 02:03:10 +03:00 committed by Greg Kroah-Hartman
parent aa03bda68a
commit 40c9748267
1 changed files with 4 additions and 3 deletions
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7
drivers/usb/host/ehci-spear.c
View File

@ -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);
}