Greg Ungerer wrote:
Hi Huergen,
^^^^^^^
Oops, typo, sorry Juergen :-)
Regards
Greg
Juergen Pfeiffer wrote:
I'm using Linux Kernel 2.6.10 for Coldfire 5485 in an embedded
application.
I developped my own device-driver (Profibus), working on the internal
UART of the coldfire.
This is on Freescales code base on the 5485 right?
(That is an old kernel...)
This Driver produces heavy hard-interrupt und soft-irq load, because
UART Data is received and transmitted with 93750 bit/s.
But the driver works fine and communicates with other devices as it
should do. No Kernel-oops.
Now i have the situation, that when i try to start some user program
like "ls" or "ps" ... out of an interactive bash,
sometimes i get a message "Segmentation fault" and the program isn't
started. Then i try again and this time it works.
This shows up in any standard user programm (most of them inside
busybox), but it happens only about every 100th try.
free shows over 1 Megabyte of free memory. I cannot believe, that the
problem is in all of the user programms.
I deactivated my driver and (bad world) no problem anymore.
So my question is:
How can an error inside a device driver produce problems in starting
user programs?
Lots of interrupts means lots of context switches, into and out
of the kernel. If there is any bugs in the entry or exit code
that interferes with the running application processes then
you can get application crashes like you see.
Of course i looked at the kmalloc()'s in my driver, but there are only
very few. They are only called on driver driver initialisation.
I could see no obvious problems yet with the allocated memory.
Much more likely to be related to the interrupt/softirq load, and
kernel code related to processing that.
Regards
Greg
Hope, somebody can help me
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