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usbnet: cdc_mbim: comments on suspend failure 

If suspend callback fails in system sleep context, usb core will
ignore the failure and let system sleep go ahead further, so
this patch comments on the case and requires that both
usbnet_suspend() and subdriver->suspend() MUST return 0 in
system sleep context.

Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Bjørn Mork <bjorn@mork.no>
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 12:08:56 +08:00 committed by Greg Kroah-Hartman
parent 37093b7017
commit 9a44312a79
1 changed files with 5 additions and 0 deletions
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5
drivers/net/usb/cdc_mbim.c
View File

@ -323,6 +323,11 @@ static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
goto error;
}
/*
* Both usbnet_suspend() and subdriver->suspend() MUST return 0
* in system sleep context, otherwise, the resume callback has
* to recover device from previous suspend failure.
*/
ret = usbnet_suspend(intf, message);
if (ret < 0)
goto error;