6.6-stable review patch. If anyone has any objections, please let me know.
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From: Takashi Iwai tiwai@suse.de
commit 116e79c679a1530cf833d0ff3007061d7a716bd9 upstream.
The EP-IN of MIDI2 (altset 1) wasn't initialized in f_midi2_create_usb_configs() as it's an INT EP unlike others BULK EPs. But this leaves rather the max packet size unchanged no matter which speed is used, resulting in the very slow access. And the wMaxPacketSize values set there look legit for INT EPs, so let's initialize the MIDI2 EP-IN there for achieving the equivalent speed as well.
Fixes: 8b645922b223 ("usb: gadget: Add support for USB MIDI 2.0 function driver") Cc: stable stable@kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de Link: https://lore.kernel.org/r/20250905133240.20966-1-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/function/f_midi2.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/function/f_midi2.c +++ b/drivers/usb/gadget/function/f_midi2.c @@ -1739,9 +1739,12 @@ static int f_midi2_create_usb_configs(st case USB_SPEED_HIGH: midi2_midi1_ep_out_desc.wMaxPacketSize = cpu_to_le16(512); midi2_midi1_ep_in_desc.wMaxPacketSize = cpu_to_le16(512); - for (i = 0; i < midi2->num_eps; i++) + for (i = 0; i < midi2->num_eps; i++) { midi2_midi2_ep_out_desc[i].wMaxPacketSize = cpu_to_le16(512); + midi2_midi2_ep_in_desc[i].wMaxPacketSize = + cpu_to_le16(512); + } fallthrough; case USB_SPEED_FULL: midi1_in_eps = midi2_midi1_ep_in_descs; @@ -1750,9 +1753,12 @@ static int f_midi2_create_usb_configs(st case USB_SPEED_SUPER: midi2_midi1_ep_out_desc.wMaxPacketSize = cpu_to_le16(1024); midi2_midi1_ep_in_desc.wMaxPacketSize = cpu_to_le16(1024); - for (i = 0; i < midi2->num_eps; i++) + for (i = 0; i < midi2->num_eps; i++) { midi2_midi2_ep_out_desc[i].wMaxPacketSize = cpu_to_le16(1024); + midi2_midi2_ep_in_desc[i].wMaxPacketSize = + cpu_to_le16(1024); + } midi1_in_eps = midi2_midi1_ep_in_ss_descs; midi1_out_eps = midi2_midi1_ep_out_ss_descs; break;