github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-07 22:14:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

usb: retry reset if a device times out

Browse Source 
commit 264904ccc3 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@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2016-02-10 11:33:18 +01:00 committed by Greg Kroah-Hartman
parent 8907d8a6fd
commit 951822beba
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/core/hub.c
View File

@ -4426,7 +4426,13 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
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 =