diff options
| author | Oliver Neukum | 2016-02-10 11:33:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2016-02-14 17:42:08 -0800 |
| commit | 264904ccc33c604d4b3141bbd33808152dfac45b (patch) | |
| tree | 740bf9db97f8a32c9fd9c19ca3a51a90021a8f09 /drivers/usb/core | |
| parent | acc27b6aad709997fa28da2f37f715a54eb487ab (diff) | |
usb: retry reset if a device times out
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>
CC: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 681036d00528..0f82db42fd59 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4496,7 +4496,13 @@ 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 = |