Re: [linux-usb-devel] why was MODALIAS removed from usb kernelevents? [u]

[Alan Stern]

On Fri, 17 Aug 2007, Andreas Jellinghaus [c] wrote:

> I need some kernel event that has both DEVICE and MODALIAS set. 
> up to including kernel 2.6.21 this seems to come from 
> drivers/usb/core/driver.c if I read the code correctly, and then
> it was removed.
> 
> udevmonitor --kernel --environment shows one event with both on 2.6.21 plain, 
> but not on 2.6.22 plain.

Does this patch improve matters?

Alan Stern



Index: 2.6.22/drivers/usb/core/message.c
===================================================================
--- 2.6.22.orig/drivers/usb/core/message.c
+++ 2.6.22/drivers/usb/core/message.c
@@ -1344,6 +1344,30 @@ static int usb_if_uevent(struct device *
 	usb_dev = interface_to_usbdev(intf);
 	alt = intf->cur_altsetting;
 
+#ifdef	CONFIG_USB_DEVICEFS
+	/* If this is available, userspace programs can directly read
+	 * all the device descriptors we don't tell them about.  Or
+	 * act as usermode drivers.
+	 */
+	if (add_uevent_var(envp, num_envp, &i,
+			   buffer, buffer_size, &length,
+			   "DEVICE=/proc/bus/usb/%03d/%03d",
+			   usb_dev->bus->busnum, usb_dev->devnum))
+		return -ENOMEM;
+#endif
+
+	if (add_uevent_var(envp, num_envp, &i,
+			   buffer, buffer_size, &length,
+			   "BUSNUM=%03d",
+			   usb_dev->bus->busnum))
+		return -ENOMEM;
+
+	if (add_uevent_var(envp, num_envp, &i,
+			   buffer, buffer_size, &length,
+			   "DEVNUM=%03d",
+			   usb_dev->devnum))
+		return -ENOMEM;
+
 	if (add_uevent_var(envp, num_envp, &i,
 		   buffer, buffer_size, &length,
 		   "INTERFACE=%d/%d/%d",

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