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USB: adds comment on suspend callback

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This patch adds comments on interface driver suspend callback
to emphasize that the failure return value is ignored by
USB core in system sleep context, so do not try to recover
device for this case and let resume/reset_resume callback
handle the suspend failure if needed.

Also kerneldoc for usb_suspend_both() is updated with the
fact.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2013-03-15 12:08:53 +08:00 • committed by Greg Kroah-Hartman
parent 2849a3a945
commit 303f084792
2 changed files with 14 additions and 4 deletions
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7
include/linux/usb.h
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@ -976,7 +976,12 @@ struct usbdrv_wrap {
* the "usbfs" filesystem. This lets devices provide ways to
* expose information to user space regardless of where they
* do (or don't) show up otherwise in the filesystem.
* @suspend: Called when the device is going to be suspended by the system.
* @suspend: Called when the device is going to be suspended by the
* system either from system sleep or runtime suspend context. The
* return value will be ignored in system sleep context, so do NOT
* try to continue using the device if suspend fails in this case.
* Instead, let the resume or reset-resume routine recover from
* the failure.
* @resume: Called when the device is being resumed by the system.
* @reset_resume: Called when the suspended device has been reset instead
* of being resumed.