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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
