On Thu, 9 Aug 2007, Andrew Morton wrote:
> This failed the Vaio test. I guess it triggered a USB bug.
>
> With this patch applied, when I hotplug my wireless mouse, the little LED
> on the mouse comes on for a second or so then goes out and no pointy clicky
> for me.
>
> It says:
>
> [ 152.481522] usb 1-1: new low speed USB device using uhci_hcd and address 2
>
>
> Without this patch applied, I get
>
> [ 195.935445] usb 2-1: new low speed USB device using uhci_hcd and address 2
> [ 196.116183] usb 2-1: configuration #1 chosen from 1 choice
> [ 196.198362] input: Microsoft Microsoft Wireless Optical Mouse 1.00 as /class/input/input7
> [ 196.223724] input: USB HID v1.11 Mouse [Microsoft Microsoft Wireless Optical Mouse 1.00] on usb-0000:00:1d.1-1
> [ 196.224570] usb 2-1: new device found, idVendor=045e, idProduct=00e1
> [ 196.224579] usb 2-1: new device strings: Mfr=1, Product=2, SerialNumber=0
> [ 196.224585] usb 2-1: Product: Microsoft Wireless Optical Mouse 1.00
> [ 196.224590] usb 2-1: Manufacturer: Microsoft
>
> and lots of pointy clickiness.
>
> I would assume that there is some msleep() in USB which is too short, and
> the present wild rounding-up which msleep() does covered up the
> incorrectly-chosen sleep duration.
>
> I'm using HZ=250 (http://userweb.kernel.org/~akpm/config-sony.txt) and it
> could well be that the mouse would fail just by going to HZ=1000, but I
> didn't bother testing that.
>
> Could one of the USB developers please suggest which msleep()(s) I should
> start looking at?
It could be one of the calls in drivers/usb/core/hub.c, however almost
all of them are at least 10 ms already. There's a 0-ms msleep near the
start of hub_port_wait_reset() which might cause problems.
It will be easier to pin down the culprit if you turn on
CONFIG_USB_DEBUG.
Alan Stern
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
