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xhci: use correct flags for spin_lock_irqrestore() when setting port power 

commit a6ff6cbf1f ("usb: xhci: Add helper function xhci_set_power_on().")
created a helper to control port power that needs to be called with
xhci->lock held and interrupts disabled.
It released the lock with spin_unlock_irqrestore using a new zero flag
variable instead of the original flag from spin_lock_irqsave.
This regression triggered a static checker warning about bogus flags, and
a null pointer dereference on armada-385.

Fix it by passing a pointer to the correct flags and using it instead

Fixes: a6ff6cbf1f ("usb: xhci: Add helper function xhci_set_power_on().")
Cc: Guoqing Zhang <guoqing.zhang@intel.com>
Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2017-04-13 14:01:04 +03:00 committed by Greg Kroah-Hartman
parent ba7756d082
commit ec1dafe8ec
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/usb/host/xhci-hub.c
View File

@ -552,11 +552,10 @@ static __le32 __iomem *xhci_get_port_io_addr(struct usb_hcd *hcd, int index)
* method.
*/
static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd,
u16 index, bool on)
u16 index, bool on, unsigned long *flags)
{
__le32 __iomem *addr;
u32 temp;
unsigned long flags = 0;
addr = xhci_get_port_io_addr(hcd, index);
temp = readl(addr);
@ -572,13 +571,13 @@ static void xhci_set_port_power(struct xhci_hcd *xhci, struct usb_hcd *hcd,
writel(temp & ~PORT_POWER, addr);
}
spin_unlock_irqrestore(&xhci->lock, flags);
spin_unlock_irqrestore(&xhci->lock, *flags);
temp = usb_acpi_power_manageable(hcd->self.root_hub,
index);
if (temp)
usb_acpi_set_power_state(hcd->self.root_hub,
index, on);
spin_lock_irqsave(&xhci->lock, flags);
spin_lock_irqsave(&xhci->lock, *flags);
}
static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
@ -598,7 +597,7 @@ static void xhci_port_set_test_mode(struct xhci_hcd *xhci,
}
static int xhci_enter_test_mode(struct xhci_hcd *xhci,
u16 test_mode, u16 wIndex)
u16 test_mode, u16 wIndex, unsigned long *flags)
{
int i, retval;
@ -614,10 +613,10 @@ static int xhci_enter_test_mode(struct xhci_hcd *xhci,
xhci_dbg(xhci, "Disable all port (PP = 0)\n");
/* Power off USB3 ports*/
for (i = 0; i < xhci->num_usb3_ports; i++)
xhci_set_port_power(xhci, xhci->shared_hcd, i, false);
xhci_set_port_power(xhci, xhci->shared_hcd, i, false, flags);
/* Power off USB2 ports*/
for (i = 0; i < xhci->num_usb2_ports; i++)
xhci_set_port_power(xhci, xhci->main_hcd, i, false);
xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags);
/* Stop the controller */
xhci_dbg(xhci, "Stop controller\n");
retval = xhci_halt(xhci);
@ -1209,7 +1208,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
* However, hub_wq will ignore the roothub events until
* the roothub is registered.
*/
xhci_set_port_power(xhci, hcd, wIndex, true);
xhci_set_port_power(xhci, hcd, wIndex, true, &flags);
break;
case USB_PORT_FEAT_RESET:
temp = (temp | PORT_RESET);
@ -1254,7 +1253,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
goto error;
if (test_mode > TEST_FORCE_EN || test_mode < TEST_J)
goto error;
retval = xhci_enter_test_mode(xhci, test_mode, wIndex);
retval = xhci_enter_test_mode(xhci, test_mode, wIndex,
&flags);
break;
default:
goto error;
@ -1322,7 +1322,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
port_array[wIndex], temp);
break;
case USB_PORT_FEAT_POWER:
xhci_set_port_power(xhci, hcd, wIndex, false);
xhci_set_port_power(xhci, hcd, wIndex, false, &flags);
break;
case USB_PORT_FEAT_TEST:
retval = xhci_exit_test_mode(xhci);