usb: core: port: do error out if usb_autopm_get_interface() fails

Reviewing a fresh portion of coverity defects in USB core
(specifically CID 1458999), Alan Stern noted below in [1]:

On Tue, Feb 25, 2020 at 02:39:23PM -0500, Alan Stern wrote:
 > A revised search finds line 997 in drivers/usb/core/hub.c and lines
 > 216, 269 in drivers/usb/core/port.c.  (I didn't try looking in any
 > other directories.)  AFAICT all three of these should check the
 > return value, although a error message in the kernel log probably
 > isn't needed.

Factor out the usb_port_runtime_{resume,suspend}() changes into a
standalone patch to allow conflict-free porting on top of stable v3.9+.

[1] https://lore.kernel.org/lkml/Pine.LNX.4.44L0.2002251419120.1485-100000@iolanthe.rowland.org

Fixes: 971fcd492cebf5 ("usb: add runtime pm support for usb port device")
Cc: stable@vger.kernel.org # v3.9+
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20200226175036.14946-3-erosca@de.adit-jv.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index bbbb35fa639fa43e6666eebfdb86c909595f6cf8..235a7c6455036ac7a6f110f943c678b09b1a24f0 100644 (file)
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -213,7 +213,10 @@ static int usb_port_runtime_resume(struct device *dev)
        if (!port_dev->is_superspeed && peer)
                pm_runtime_get_sync(&peer->dev);
 
-       usb_autopm_get_interface(intf);
+       retval = usb_autopm_get_interface(intf);
+       if (retval < 0)
+               return retval;
+
        retval = usb_hub_set_port_power(hdev, hub, port1, true);
        msleep(hub_power_on_good_delay(hub));
        if (udev && !retval) {
@@ -266,7 +269,10 @@ static int usb_port_runtime_suspend(struct device *dev)
        if (usb_port_block_power_off)
                return -EBUSY;
 
-       usb_autopm_get_interface(intf);
+       retval = usb_autopm_get_interface(intf);
+       if (retval < 0)
+               return retval;
+
        retval = usb_hub_set_port_power(hdev, hub, port1, false);
        usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
        if (!port_dev->is_superspeed)