linux-kernel - Re: [PATCH] Documentation/firmware_class/firmware_sample

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Message-Id: <1182966569.9499.1.camel@aeonflux.holtmann.net>
Date:	Wed, 27 Jun 2007 19:49:29 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Anders Blomdell <anders.blomdell@...trol.lth.se>
Cc:	linux-kernel@...r.kernel.org,
	Manuel Estrada Sainz <ranty@...ian.org>
Subject: Re: [PATCH] Documentation/firmware_class/firmware_sample_driver.c

Hi Anders,

> Signed-off-by: Anders Blomdell <anders.blomdell@...trol.lth.se>
> 
> Minor modifications to make the example load and unload without Oops
> 
> This is what unpatched version generates with 2.6.21.3
> 
> kernel: Oops: 0000 [#2]
> ...
> kernel: Call Trace:
> kernel:  [<c04ae541>] sysfs_create_dir+0x49/0x63
> kernel:  [<c04e76ae>] kobject_shadow_add+0xd5/0x17d
> kernel:  [<c04e7908>] kobject_set_name+0x2b/0x92
> kernel:  [<c0556444>] device_add+0x9a/0x58e
> kernel:  [<c0620b65>] klist_init+0x23/0x2e
> kernel:  [<c055bfee>] _request_firmware+0x116/0x29f
> kernel:  [<c062149f>] wait_for_completion+0x8b/0x93
> kernel:  [<c055c20b>] request_firmware+0xf/0x11
> kernel:  [<e09420d9>] sample_init+0x59/0xc0 [firmware_sample_driver]
> kernel:  [<c0446c92>] sys_init_module+0x16b7/0x17ee
> kernel:  [<c04294de>] printk+0x0/0x1f
> kernel:  [<c0488436>] mntput_no_expire+0x11/0x6e
> kernel:  [<c0404fa8>] syscall_call+0x7/0xb
> 
> 
> 
> diff -u Documentation/firmware_class/firmware_sample_driver.c
> /tmp/fw/firmware_sample_driver.c
> --- Documentation/firmware_class/firmware_sample_driver.c       2007-05-24
> 23:22:47.000000000 +0200
> +++ /tmp/fw/firmware_sample_driver.c    2007-06-27 16:51:16.000000000 +0200
> @@ -15,11 +15,16 @@
> 
>  #include "linux/firmware.h"
> 
> +static void ghost_release(struct device *dev)
> +{
> +       printk(KERN_DEBUG "firmware_sample_driver: ghost_release\n");
> +}
> +

I know it is a sample driver, but you can't do that. You have to
allocate the device and then free it here.

Regards

Marcel


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