Commit 93e4f47f authored by Ming Lei's avatar Ming Lei Committed by Greg Kroah-Hartman

USB: serial: 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 serial->type->suspend()
MUST return 0 in system sleep context.
Acked-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 303f0847
......@@ -1137,6 +1137,11 @@ int usb_serial_suspend(struct usb_interface *intf, pm_message_t message)
serial->suspending = 1;
/*
* serial->type->suspend() MUST return 0 in system sleep context,
* otherwise, the resume callback has to recover device from
* previous suspend failure.
*/
if (serial->type->suspend) {
r = serial->type->suspend(serial, message);
if (r < 0) {
......
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