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Operating Systems Linux kernel functions issue!
# 1  
Old 09-30-2008
kernel functions issue!
Hello All,

I'm new to linux programming and this is my first post.I am porting ethernet driver from Linux2.4 to Linux2.6 for Xscale, after modifications I am able to install the driver.
Now when i assign the address to my device using ifconfig, kenerl is going to panic. Stack trace is showing it is due to NULL pointer dereference in recalc_sigpending(). Replacing it by signal_pending(current) saves that. I could not figure out te difference, since both will ultimately access only one kernel data structure i.e. current.
Could anyone please throw light onto it?

I have given relevant details hopefully, but if some important information is missing, please point out. I would improve in my subsequent posts.

Thanks in advance for any help.
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LEARN ABOUT FREEBSD

tdfx_linux

TDFX(4) 						   BSD Kernel Interfaces Manual 						   TDFX(4)

NAME

     tdfx -- Voodoo Graphics and VoodooII Memory Access GLIDE device driver

SYNOPSIS

     device tdfx
     device tdfx_linux

DESCRIPTION

     This driver creates an entry in /dev that allows programs (mostly GLIDE-based software) to access the device memory of the Voodoo Graphics
     and VoodooII 3D accelerators created by 3Dfx, Inc.  This provides an interface for applications based on the GLIDE API or that simply use the
     API provided by the linux /dev/3dfx device to use the video device.

     Supports all cards based on the following chipsets:

	   3Dfx Voodoo Graphics
	   3Dfx Voodoo II

     Specifically, the following cards should work:

	   Diamond Multimedia Monster 3D
	   Diamond Multimedia Monster 3D II

     Note that this driver does not currently have support for the Voodoo Banshee, Voodoo3, Voodoo5, or Voodoo6 based cards.  It also does not
     currently support the Voodoo Rush.  It also does not yet handle the SLI feature of the Voodoo II boards.  You can only use each of them sepa-
     rately.

     By including tdfx_linux, you can enable the linux ioctl code for this driver, where the only supported applications currently reside.

FILES

     /dev/3dfx	   Symlinked to default 3dfx board
     /dev/3dfx*    Character Device programming interface

     /dev/voodoo   Mirrors of above interfaces
     /dev/voodoo*  (Some apps use /dev/voodoo)

HISTORY

     The tdfx driver appeared in FreeBSD 5.0, and was originally developed for Linux kernel 2.0.x, later written for 2.2.x and 2.4.x.

AUTHORS

     The driver was developed by Coleman Kane <cokane@micro.ti.com> after the linux version of this driver by Darryll Straus, John Taylor, Jens
     Axboe, Carlo Wood <carlo@alinoe.com> and Joseph Kain <joseph@3dfx.com> to be directly compatible with it and support the many GLIDE based
     games available for Linux and UNIX.

BSD
								 February 19, 2001							       BSD