| Message ID | 20241114230310.432213-1-mordan@ispras.ru (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | usb: ehci-spear: fix call balance of sehci clk handling routines | expand |
On Fri, Nov 15, 2024 at 02:03:10AM +0300, Vitalii Mordan wrote: > 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@vger.kernel.org > Signed-off-by: Vitalii Mordan <mordan@ispras.ru> > --- Acked-by: Alan Stern <stern@rowland.harvard.edu> > 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 >
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); }
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@vger.kernel.org Signed-off-by: Vitalii Mordan <mordan@ispras.ru> --- drivers/usb/host/ehci-spear.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)