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kernel functions issue!

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# 1  
Old 10-01-2008
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

virtio_scsi

VIRTIO_SCSI(4)						   BSD Kernel Interfaces Manual 					    VIRTIO_SCSI(4)

NAME

     virtio_scsi -- VirtIO SCSI driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device virtio_scsi

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   virtio_scsi_load="YES"

DESCRIPTION

     The virtio_scsi device driver provides support for VirtIO SCSI devices.

LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).

     hw.vtscsi.bus_reset_disable
	     In the initial QEMU release with VirtIO SCSI support, in-flight operations were not aborted when stopping the device, rendering bus
	     reset ineffective. This tunable disables attempts to issue reset bus commands. The default value is 1.

DEBUGGING

     To enable debugging prints from the virtio_scsi driver, set the

	   hw.vtscsi.X.debug_level

     variable, where X is the adapter number, either in loader.conf(5) or via sysctl(8).  The following bits have the described effects:

	   0x01    Enable informational prints.

	   0x02    Enable prints for driver errors.

	   0x04    Enable tracing prints.

SEE ALSO

     virtio(4)

HISTORY

     The virtio_scsi driver was written by Bryan Venteicher <bryanv@FreeBSD.org>.  It first appeared in FreeBSD 10.0.

BSD
								   June 24, 2012							       BSD