From 63d6d7ed475c53dc1cabdfedf63de1fd8dcd72ee Mon Sep 17 00:00:00 2001
From: Eugeniu Rosca <erosca@de.adit-jv.com>
Date: Wed, 26 Feb 2020 18:50:34 +0100
Subject: [PATCH] usb: core: hub: fix unhandled return by employing a void function
Git-commit: 63d6d7ed475c53dc1cabdfedf63de1fd8dcd72ee
Patch-mainline: v5.6-rc5
References: git-fixes
Address below Coverity complaint (Feb 25, 2020, 8:06 AM CET):
*** CID 1458999: Error handling issues (CHECKED_RETURN)
/drivers/usb/core/hub.c: 1869 in hub_probe()
1863
1864 if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
1865 hub->quirk_check_port_auto_suspend = 1;
1866
1867 if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) {
1868 hub->quirk_disable_autosuspend = 1;
>>> CID 1458999: Error handling issues (CHECKED_RETURN)
>>> Calling "usb_autopm_get_interface" without checking return value (as is done elsewhere 97 out of 111 times).
1869 usb_autopm_get_interface(intf);
1870 }
1871
1872 if (hub_configure(hub, &desc->endpoint[0].desc) >= 0)
1873 return 0;
1874
Rather than checking the return value of 'usb_autopm_get_interface()',
switch to the usb_autopm_get_interface_no_resume() API, as per:
On Tue, Feb 25, 2020 at 10:32:32AM -0500, Alan Stern wrote:
------ 8< ------
> This change (i.e. 'ret = usb_autopm_get_interface') is not necessary,
> because the resume operation cannot fail at this point (interfaces
> are always powered-up during probe). A better solution would be to
> call usb_autopm_get_interface_no_resume() instead.
------ 8< ------
Fixes: 1208f9e1d758c9 ("USB: hub: Fix the broken detection of USB3 device in SMSC hub")
Cc: Hardik Gajjar <hgajjar@de.adit-jv.com>
Cc: stable@vger.kernel.org # v4.14+
Reported-by: scan-admin@coverity.com
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/20200226175036.14946-1-erosca@de.adit-jv.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/usb/core/hub.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 1d212f82c69b..1105983b5c1c 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1866,7 +1866,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) {
hub->quirk_disable_autosuspend = 1;
- usb_autopm_get_interface(intf);
+ usb_autopm_get_interface_no_resume(intf);
}
if (hub_configure(hub, &desc->endpoint[0].desc) >= 0)
--
2.16.4