[PATCH] usbmidi.c: Call usb_autopm functions from rawmidi open/close callbacks

[PATCH] usbmidi.c: Call usb_autopm functions from rawmidi open/close callbacks

[Karsten Wiese]

Lets "usb auto suspend" work for devices that set their
usb_driver::supports_autosuspend to 1.
Has no effect for other devices.

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
---
 sound/usb/usbmidi.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 6c616c7..842486f 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -860,11 +860,14 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
 	}
 	substream->runtime->private_data = port;
 	port->state = STATE_UNKNOWN;
+	usb_autopm_get_interface(umidi->iface);
 	return 0;
 }
 
 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
 {
+	struct snd_usb_midi* umidi = substream->rmidi->private_data;
+	usb_autopm_put_interface(umidi->iface);
 	return 0;
 }
 
-- 
1.5.3.3


-------------------------------------------------------

Re: [PATCH] usbmidi.c: Call usb_autopm functions from rawmidi open/close callbacks

[Clemens Ladisch]

Karsten Wiese wrote:
> Lets "usb auto suspend" work for devices that set their
> usb_driver::supports_autosuspend to 1.

... as long as there are no MIDI input ports.

I'm planning to apply these patches:
http://thread.gmane.org/gmane.linux.usb.general/1002/focus=1414


Regards,
Clemens