This is a note to let you know that I've just added the patch titled usb: retry reset if a device times out to the 4.5-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-retry-reset-if-a-device-times-out.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 264904ccc33c604d4b3141bbd33808152dfac45b Mon Sep 17 00:00:00 2001 From: Oliver Neukum <oneukum@xxxxxxxx> Date: Wed, 10 Feb 2016 11:33:18 +0100 Subject: usb: retry reset if a device times out From: Oliver Neukum <oneukum@xxxxxxxx> commit 264904ccc33c604d4b3141bbd33808152dfac45b upstream. Some devices I got show an inability to operate right after power on if they are already connected. They are beyond recovery if the descriptors are requested multiple times. So in case of a timeout we rather bail early and reset again. But it must be done only on the first loop lest we get into a reset/time out spiral that can be overcome with a retry. This patch is a rework of a patch that fell through the cracks. http://www.spinics.net/lists/linux-usb/msg103263.html Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/hub.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4441,7 +4441,13 @@ hub_port_init(struct usb_hub *hub, struc r = -EPROTO; break; } - if (r == 0) + /* + * Some devices time out if they are powered on + * when already connected. They need a second + * reset. But only on the first attempt, + * lest we get into a time out/reset loop + */ + if (r == 0 || (r == -ETIMEDOUT && j == 0)) break; } udev->descriptor.bMaxPacketSize0 = Patches currently in stable-queue which might be from oneukum@xxxxxxxx are queue-4.5/usb-cdc-acm-more-sanity-checking.patch queue-4.5/usb-mct_u232-add-sanity-checking-in-probe.patch queue-4.5/usb-digi_acceleport-do-sanity-checking-for-the-number-of-ports.patch queue-4.5/usb-cypress_m8-add-endpoint-sanity-check.patch queue-4.5/usb-retry-reset-if-a-device-times-out.patch queue-4.5/usb-hub-fix-a-typo-in-hub_port_init-leading-to-wrong-logic.patch queue-4.5/usb-usb_driver_claim_interface-add-sanity-checking.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html