| Message ID | 1395968039-11818-1-git-send-email-kamal@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index a6b2cab..62441e3 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -724,6 +724,10 @@ int usb_get_configuration(struct usb_device *dev) result = -ENOMEM; goto err; } + + if (dev->quirks & USB_QUIRK_DELAY_INIT) + msleep(100); + result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, bigbuffer, length); if (result < 0) {
This is a note to let you know that I have just added a patch titled usb: Make DELAY_INIT quirk wait 100ms between Get Configuration to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue This patch is scheduled to be released in version 3.8.13.21. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 73ec814b811852d64e728e25d933867ca2779d36 Mon Sep 17 00:00:00 2001 From: Julius Werner <jwerner@chromium.org> Date: Tue, 4 Mar 2014 11:27:38 -0800 Subject: usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests commit d86db25e53fa69e3e97f3b55dd82a70689787c5d upstream. The DELAY_INIT quirk only reduces the frequency of enumeration failures with the Logitech HD Pro C920 and C930e webcams, but does not quite eliminate them. We have found that adding a delay of 100ms between the first and second Get Configuration request makes the device enumerate perfectly reliable even after several weeks of extensive testing. The reasons for that are anyone's guess, but since the DELAY_INIT quirk already delays enumeration by a whole second, wating for another 10th of that isn't really a big deal for the one other device that uses it, and it will resolve the problems with these webcams. Signed-off-by: Julius Werner <jwerner@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/usb/core/config.c | 4 ++++ 1 file changed, 4 insertions(+) -- 1.8.3.2