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| author | Ming Lei <ming.lei@canonical.com> | 2013-03-15 05:08:54 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-25 18:55:46 +0100 |
| commit | 93e4f47f4d1a3483f009202e8a66a3a08de5c4b6 (patch) | |
| tree | 5dde1f9ff6ff273d80e1f53677fc5a682dd149f7 | |
| parent | USB: adds comment on suspend callback (diff) | |
| download | linux-93e4f47f4d1a3483f009202e8a66a3a08de5c4b6.tar.xz linux-93e4f47f4d1a3483f009202e8a66a3a08de5c4b6.zip | |
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: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index bbe7f2eb8160..2fc05004c1b6 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -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) { |