| From 03e8f49b735d3631a62de7c4e90ab270b95e0db3 Mon Sep 17 00:00:00 2001 |
| From: Eugeniu Rosca <erosca@de.adit-jv.com> |
| Date: Wed, 26 Feb 2020 18:50:36 +0100 |
| Subject: [PATCH] usb: core: port: do error out if usb_autopm_get_interface() |
| fails |
| |
| commit 1f8b39bc99a31759e97a0428a5c3f64802c1e61d upstream. |
| |
| 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> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c |
| index 1a06a4b5fbb1..ae25d3aa7560 100644 |
| --- 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) |
| -- |
| 2.7.4 |
| |
