lkml.org 
[lkml]   [2009]   [Jul]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: Floppy constantly accessed in 2.6.31-rc2
On Sun, 12 Jul 2009 23:44:19 -0600
Robert Hancock <hancockrwd@gmail.com> wrote:

> On 2.6.31-rc2 (actually current git as of today) the floppy drive is
> constantly being accessed with these messages being reported:
>
> Platform driver 'floppy' needs updating - please use dev_pm_ops
> Floppy drive(s): fd0 is 1.44M
> FDC 0 is a post-1991 82077
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
> end_request: I/O error, dev fd0, sector 0
>
> lsof reports no process with /dev/fd0 open so it is not clear what is
> causing this activity. It looks like the access starts when I log in to
> X, but doesn't stop when I log out. I'm guessing HAL or something checks
> the floppy drive and then the kernel somehow gets stuck in a loop
> retrying the request..
>
> Anyone have any ideas what might be causing this? Commit
> 5e50b9ef975219304cc91d601530994861585bfe seemed a bit suspicious but
> reverting it didn't seem to help. (It did get rid of the dev_pm_ops
> message, though..)

I'd suggest doing something like this:

--- a/drivers/block/floppy.c~a
+++ a/drivers/block/floppy.c
@@ -2975,6 +2975,7 @@ static struct cont_t rw_cont = {

static void process_fd_request(void)
{
+ dump_stack();
cont = &rw_cont;
schedule_bh(redo_fd_request);
}
_
to find out who is poking the floppy.

If you're correct and some process is stuck doing infinite retries then
that process should be visible in the `ps' output, probably stuck in D
state. Please have a look, see if you can work out which process is
hitting the problem and gather its kernel stack backtrace, thanks.

Meanwhile I'll ask Rafael to add this to the regression list.



\
 
 \ /
  Last update: 2009-07-14 00:47    [W:0.716 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site