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authorFrans Pop <elendil@planet.nl>2009-06-04 22:30:48 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:47 -0700
commit23a54e567534d4895056df558e2564114513524a (patch)
treed2a7967bc412becb9b7dce6b48f6d468a57e10e3 /drivers/usb
parent453f77558810ffa669ed5a510a7173ec49def396 (diff)
USB: Avoid PM error messages during resume if a device was disconnected
Currently if a laptop is suspended e.g. while docked and then resumed after undocking it, the following errors get generated because the USB hub in the docking station and the devices connected to it are no longer available: pm_op(): usb_dev_resume+0x0/0x10 returns -19 PM: Device 1-2 failed to resume: error -19 pm_op(): usb_dev_resume+0x0/0x10 returns -19 PM: Device 1-2.2 failed to resume: error -19 pm_op(): usb_dev_resume+0x0/0x10 returns -19 PM: Device 1-2.3 failed to resume: error -19 As the removal of USB devices while a system is suspended is a relatively common use case and in most cases not an error, just return success on -ENODEV. The user gets informed anyway as the USB subsystem generates regular disconnect messages for the devices shortly afterwards: usb 1-2: USB disconnect, address 3 usb 1-2.2: USB disconnect, address 4 usblp0: removed usb 1-2.3: USB disconnect, address 5 Signed-off-by: Frans Pop <elendil@planet.nl> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/driver.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 77de8d65862..69e5773abfc 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1750,6 +1750,7 @@ int usb_suspend(struct device *dev, pm_message_t msg)
int usb_resume(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
+ int status;
udev = to_usb_device(dev);
@@ -1759,7 +1760,14 @@ int usb_resume(struct device *dev, pm_message_t msg)
*/
if (udev->skip_sys_resume)
return 0;
- return usb_external_resume_device(udev, msg);
+ status = usb_external_resume_device(udev, msg);
+
+ /* Avoid PM error messages for devices disconnected while suspended
+ * as we'll display regular disconnect messages just a bit later.
+ */
+ if (status == -ENODEV)
+ return 0;
+ return status;
}
#endif /* CONFIG_PM */