On Sat, 27 Aug 2011, Oliver Neukum wrote:
> From 6005022e0cd3cfaf0826c9784bea584c63d30498 Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <[email protected]>
> Date: Sat, 27 Aug 2011 19:59:17 +0200
> Subject: [PATCH] USB:add RESET_RESUME for webcams shown to be quirky
>
> The new runtime PM code has shown that many webcams suffer
> from a race condition that may crash them upon resume.
> Runtime PM is especially prone to show the problem because
> it retains power to the cameras at all times. However
> system suspension may also crash the devices and retain
> power to the devices.
> The only way to solve this problem without races is in
> usbcore with the RESET_RESUME quirk.
Has this been discussed on the linux-media list or with the webcam
maintainers?
Is this related in any way to Bugzilla #40352?
> @@ -65,6 +83,9 @@ static const struct usb_device_id usb_quirk_list[] = {
> { USB_DEVICE(0x0638, 0x0a13), .driver_info =
> USB_QUIRK_STRING_FETCH_255 },
>
> + /* Guillemot Webcam Hercules Dualpix Exchange*/
> + { USB_DEVICE(0x06f8, 0x0804), .driver_info = USB_QUIRK_RESET_RESUME },
> +
> /* Saitek Cyborg Gold Joystick */
> { USB_DEVICE(0x06a3, 0x0006), .driver_info =
> USB_QUIRK_CONFIG_INTF_STRINGS },
Come on, Oliver! 0x06f8 > 0x06a3.
Alan Stern
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