This is a note to let you know that I've just added the patch titled
usb: Fix regression caused by invalid ep0 maxpacket in virtual SuperSpeed device
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-fix-regression-caused-by-invalid-ep0-maxpacket-in-virtual-superspeed-device.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c78c3644b772e356ca452ae733a3c4de0fb11dc8 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Apr 2024 10:33:48 -0400
Subject: usb: Fix regression caused by invalid ep0 maxpacket in virtual SuperSpeed device
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
commit c78c3644b772e356ca452ae733a3c4de0fb11dc8 upstream.
A virtual SuperSpeed device in the FreeBSD BVCP package
(https://bhyve.npulse.net/) presents an invalid ep0 maxpacket size of 256.
It stopped working with Linux following a recent commit because now we
check these sizes more carefully than before.
Fix this regression by using the bMaxpacketSize0 value in the device
descriptor for SuperSpeed or faster devices, even if it is invalid. This
is a very simple-minded change; we might want to check more carefully for
values that actually make some sense (for instance, no smaller than 64).
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-and-tested-by: Roger Whittaker <roger.whittaker@xxxxxxxx>
Closes: https://bugzilla.suse.com/show_bug.cgi?id=1220569
Link: https://lore.kernel.org/linux-usb/9efbd569-7059-4575-983f-0ea30df41871@xxxxxxxx/
Fixes: 59cf44575456 ("USB: core: Fix oversight in SuperSpeed initialization")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/4058ac05-237c-4db4-9ecc-5af42bdb4501@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5049,9 +5049,10 @@ hub_port_init(struct usb_hub *hub, struc
}
if (usb_endpoint_maxp(&udev->ep0.desc) == i) {
; /* Initial ep0 maxpacket guess is right */
- } else if ((udev->speed == USB_SPEED_FULL ||
+ } else if (((udev->speed == USB_SPEED_FULL ||
udev->speed == USB_SPEED_HIGH) &&
- (i == 8 || i == 16 || i == 32 || i == 64)) {
+ (i == 8 || i == 16 || i == 32 || i == 64)) ||
+ (udev->speed >= USB_SPEED_SUPER && i > 0)) {
/* Initial guess is wrong; use the descriptor's value */
if (udev->speed == USB_SPEED_FULL)
dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-5.15/usb-ohci-prevent-missed-ohci-interrupts.patch
queue-5.15/usb-fix-regression-caused-by-invalid-ep0-maxpacket-in-virtual-superspeed-device.patch
