linux-kernel - [PATCH] usb: gadget: midi2: Fix missing UMP group attributes initialization

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Message-ID: <20250904153932.13589-1-tiwai@suse.de>
Date: Thu,  4 Sep 2025 17:39:24 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: midi2: Fix missing UMP group attributes initialization

The gadget card driver forgot to call snd_ump_update_group_attrs()
after adding FBs, and this leaves the UMP group attributes
uninitialized.  As a result, -ENODEV error is returned at opening a
legacy rawmidi device as an inactive group.

This patch adds the missing call to address the behavior above.

Fixes: 8b645922b223 ("usb: gadget: Add support for USB MIDI 2.0 function driver")
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/usb/gadget/function/f_midi2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/f_midi2.c b/drivers/usb/gadget/function/f_midi2.c
index 0a800ba53816..b351f9ae0fc5 100644
--- a/drivers/usb/gadget/function/f_midi2.c
+++ b/drivers/usb/gadget/function/f_midi2.c
@@ -1599,6 +1599,7 @@ static int f_midi2_create_card(struct f_midi2 *midi2)
 			strscpy(fb->info.name, ump_fb_name(b),
 				sizeof(fb->info.name));
 		}
+		snd_ump_update_group_attrs(ump);
 	}
 
 	for (i = 0; i < midi2->num_eps; i++) {
-- 
2.50.1