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usb: gadget: midi2: Fix the response for FB info with block 0xff

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commit 228a953e61 upstream.

When the block number 0xff is given to Function Block Discovery
message, the device should return the information of all Function
Blocks, but currently the gadget driver treats it as an error.

Implement the proper behavior for the block 0xff instead.

Fixes: 8b645922b2 ("usb: gadget: Add support for USB MIDI 2.0 function driver")
Cc: stable@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240717095102.10493-1-tiwai@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2024-07-17 11:50:53 +02:00 committed by Greg Kroah-Hartman
parent 1a9df57d57
commit a4f0d0a013
1 changed files with 15 additions and 6 deletions
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21
drivers/usb/gadget/function/f_midi2.c
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@ -642,12 +642,21 @@ static void process_ump_stream_msg(struct f_midi2_ep *ep, const u32 *data)
if (format)
return; // invalid
blk = (*data >> 8) & 0xff;
if (blk >= ep->num_blks)
return;
if (*data & UMP_STREAM_MSG_REQUEST_FB_INFO)
reply_ump_stream_fb_info(ep, blk);
if (*data & UMP_STREAM_MSG_REQUEST_FB_NAME)
reply_ump_stream_fb_name(ep, blk);
if (blk == 0xff) {
/* inquiry for all blocks */
for (blk = 0; blk < ep->num_blks; blk++) {
if (*data & UMP_STREAM_MSG_REQUEST_FB_INFO)
reply_ump_stream_fb_info(ep, blk);
if (*data & UMP_STREAM_MSG_REQUEST_FB_NAME)
reply_ump_stream_fb_name(ep, blk);
}
} else if (blk < ep->num_blks) {
/* only the specified block */
if (*data & UMP_STREAM_MSG_REQUEST_FB_INFO)
reply_ump_stream_fb_info(ep, blk);
if (*data & UMP_STREAM_MSG_REQUEST_FB_NAME)
reply_ump_stream_fb_name(ep, blk);
}
return;
}
}