linux-kernel - Re: 2.6.21-rc6-mm1 USB related boot hang

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Message-ID: <Pine.LNX.4.64.0704122023510.12991@twin.jikos.cz>
Date:	Thu, 12 Apr 2007 20:32:50 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Helge Hafting <helgehaf@...el.hist.no>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-usb-devel@...ts.sourceforge.net
Subject: Re: 2.6.21-rc6-mm1 USB related boot hang

On Thu, 12 Apr 2007, Helge Hafting wrote:

> The last messages (handwritten, somewhat shortened)
> calling hid_init+0x0/0x10()
> returned 0
> ran for 0 msec
> calling hid_init+0x0/0x50()
> usbcore registered new interface driver hiddev
> and then it hangs completely.

OK, so it hangs somewhere nearby usbhid's hid_init(), and the 
usb_register() has been already invoked. Could you please apply the 
superstupid patch below and send me the output up to the point it hangs? I 
am curious to know whether it hangs somewhere inside usb_register(), or 
elsewhere.

Thanks.

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 1ddca31..d930f62 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1550,15 +1550,22 @@ static int __init hid_init(void)
 	retval = hiddev_init();
 	if (retval)
 		goto hiddev_init_fail;
+	printk(KERN_DEBUG "hid_init: before usb_register()\n");
 	retval = usb_register(&hid_driver);
+	printk(KERN_DEBUG "hid_init: after usb_register(), retuned %d\n", retval);
 	if (retval)
 		goto usb_register_fail;
 	info(DRIVER_VERSION ":" DRIVER_DESC);
 
+	printk(KERN_DEBUG "hid_init: returning 0\n");
+	dump_stack();
 	return 0;
 usb_register_fail:
+	printk(KERN_DEBUG "hid_init: calling hiddev_exit()\n");
 	hiddev_exit();
 hiddev_init_fail:
+	printk(KERN_DEBUG "hid_init: returning %d\n", retval);
+	dump_stack();
 	return retval;
 }
 
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