Hi,
Thanks for your reply.
I can’t use Tasklet because I called
this function from Netfilter hook function. Is there any way to solve this
problem?
With Thanks & Regards,
K. Lekshmanan
From: kernelnewbies-bounce@xxxxxxxxxxxx
[mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On
Behalf Of Martin Candurra
Sent: Thursday, January 17, 2008
10:34 PM
To: Matthias Kaehlcke
Cc: kernelnewbies@xxxxxxxxxxxx
Subject: Re: working files from
Interupt routine
Writing to a file probably puts the process to sleep. That is not
possible if you are in an interrupt context,
even if you could, the idea of an interrupt handler is to be as quick
as possible.
You have to use Tasklets for what you want to do. You can
check how to use it from Linux Device Drivers book.
On 1/17/08, Matthias
Kaehlcke <matthias@xxxxxxxxxxxx>
wrote:
El Thu, Jan 17, 2008 at
05:49:32PM +0530 Kathiresan, Lekshmanan ha dit:
>
> I have written
code to create ordinary file from Linux kernel
> module. This code is working fine in normal
execution, but its hangs when
> this function called from hook function or ISR.
>
> Please advice me, what should I do to solve this
problem.
>
> Suppose if I remove
variable arguments from this function. Its give
> error "Failed to write". This problem
comes only when I call from hook or
> ISR.
Writing a file from an ISR doesn't sound like a good idea to me. I
suppose your problem is that your code blocks in vfs_write() or one of
the other calls that might block. I think you'd do better writing to a
(preallocated) buffer and write this buffer in a non-atomic context
where sleeping is allowed.
--
Matthias Kaehlcke
Linux System Developer
Barcelona
The assumption that what currently exists must
necessarily
exist is the acid that corrodes all visionary thinking
.''`.
using free software / Debian GNU/Linux | http://debian.org : :' :
`. `'`
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