Re: [PATCH] usb: avoid PM error messages during resume if a device was disconnected

[Frans Pop <elendil@planet.nl>]

On Monday 23 March 2009, Frans Pop wrote:
> 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>
> Cc: Alan Stern <stern@rowland.harvard.edu>
> Cc: Rafael J. Wysocki <rjw@sisk.pl>

Forgot to mention that the patch is intended on top of Rafael's "Rework 
disabling of interrupts during suspend-resume" series.