Date: Fri, 08 Feb 2002 13:51:12 -0800 From: "Srinivas Dharmasanam" <the_srinivas@hotmail.com> To: n_hibma@qubesoft.com Cc: freebsd-hackers@freebsd.org Subject: USB device framework in FreeBSD 4.2 Message-ID: <F127PIwXrZhMddY7V4D00005ad7@hotmail.com>
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Nick, I'm trying to use a modified version of the ugen driver in FreeBSD 4.2 to control a USB device from the kernel space and am getting a kernel crash with a page fault trap (trap_fatal) when I try to do open on this device. From a user process, I am able to open this device with no problem but when I call the underlying open() function from an ISR (so that I get kernel mode), I get this fatal trap. The backtrace of the kernel core dump is pasted below. Note that the usbd_transfer() function in usbdi.c has the call tsleep() that is causing this trap. Can you please let me know how I would be able to access a USB device from the kernel space? Do I have to write another USB driver along with the usbdi.c interface or is there a way I can do this with the existing USB device framework? Thanks, -Srinivas _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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