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From: "Kay Sievers" <kay.sievers@vrfy.org>
To: "Peter Zijlstra" <a.p.zijlstra@chello.nl>
Cc: "Folkert van Heusden" <folkert@vanheusden.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create_link
Date: Mon, 3 Nov 2008 12:53:03 +0100	[thread overview]
Message-ID: <ac3eb2510811030353i72a2a5f6i8869addea1057cfa@mail.gmail.com> (raw)
In-Reply-To: <1225445335.7803.1214.camel@twins>

On Fri, Oct 31, 2008 at 10:28, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> On Fri, 2008-10-31 at 00:23 +0100, Kay Sievers wrote:
>
>> Peter, it looks like bdi does not work for devices which share a single queue.
>> If I add:
>>   --- a/mm/backing-dev.c
>>  +++ b/mm/backing-dev.c
>>   @@ -184,6 +184,8 @@ int bdi_register(struct backing_dev_info *bdi,
>> struct device *parent,
>>                   goto exit;
>>           }
>>
>>   +       printk("XXXXXXX old bdidev is %p\n", bdi->dev);
>>   +       printk("XXXXXXX new bdidev is %p\n", dev);
>>           bdi->dev = dev;
>>           bdi_debug_register(bdi, dev_name(dev));
>>
>> I get:
>>   $ modprobe floppy
>>   Floppy drive(s): fd0 is 1.44M, fd1 is 1.44M
>>   FDC 0 is a S82078B
>>   XXXXXXX old bdidev is 0000000000000000
>>   XXXXXXX new bdidev is ffff88001f20cd10
>>   XXXXXXX old bdidev is ffff88001f20cd10
>>   XXXXXXX new bdidev is ffff88001f20de30
>>
>> which very much looks like bdi will not remove any earlier registered
>> device, only the last one, right?
>
> Sharing a bdi is odd to begin with, let me poke at this a little.

Yeah, it's odd, but I'm not sure if you want to touch floppy.c. :)
Any objection to this patch, until you possible fix it differently?
  http://marc.info/?l=linux-kernel&m=122541569310798&w=4

Kay

  reply	other threads:[~2008-11-03 11:53 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-28 15:11 Folkert van Heusden
2008-10-28 23:07 ` Kay Sievers
2008-10-29  9:40   ` Folkert van Heusden
2008-10-29 10:01     ` Bryan Wu
2008-10-29 12:28       ` Kay Sievers
2008-10-29 12:25     ` Kay Sievers
2008-10-29 13:27       ` Folkert van Heusden
2008-10-29 14:49         ` Kay Sievers
2008-10-29 15:25           ` Folkert van Heusden
2008-10-29 21:51             ` Kay Sievers
2008-10-30 10:55               ` Folkert van Heusden
2008-10-30 23:06                 ` Kay Sievers
2008-10-30 23:23                   ` Kay Sievers
2008-10-31  1:13                     ` Kay Sievers
2008-10-31  9:28                     ` Peter Zijlstra
2008-11-03 11:53                       ` Kay Sievers [this message]
2008-11-03 11:55                         ` Peter Zijlstra

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