linux-kernel - Re: [PATCH v3] scsi_debug: Convert to use root_device_register() and root_device

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Date:	Mon, 06 Sep 2010 22:56:40 -0400
From:	Douglas Gilbert <dgilbert@...erlog.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Richard Sharpe <realrichardsharpe@...il.com>,
	Christoph Hellwig <hch@....de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH v3] scsi_debug: Convert to use root_device_register()
 and root_device_unregister()

On 10-09-06 08:32 PM, Dmitry Torokhov wrote:
> On Mon, Sep 06, 2010 at 05:24:28PM -0700, Nicholas A. Bellinger wrote:
>> From: Nicholas Bellinger<nab@...ux-iscsi.org>
>>
>> Hi Doug and Co,
>>
>> This patch updates the scsi_debug virtual LLD to use root_device_register()
>> and root_device_unregister() from include/linux/device.h instead of device_register()
>> and device_unregister() respectively within scsi_debug_init() and scsi_debug_exit()
>> This simply involved converting the static struct device pseudo_primary into a
>> pointer that is setup by the call to root_device_register().
>>
>> This patch also contains the correct IS_ERR() conditional check of
>> root_device_register() from within scsi_debug_init().
>>
>> Thanks to Richard Sharpe and Dmitry Torokhov for their help with this item.
>>
>> Signed-off-by: Nicholas A. Bellinger<nab@...ux-iscsi.org>
>
> Thanks for making the changes.
>
> Acked-by: Dmitry Torokhov<dtor@...l.ru>

Acked-by: Douglas Gilbert <dgilbert@...erlog.com>

>> ---
>>   drivers/scsi/scsi_debug.c |   25 ++++++++-----------------
>>   1 files changed, 8 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
>> index b02bdc6..6047c10 100644
>> --- a/drivers/scsi/scsi_debug.c
>> +++ b/drivers/scsi/scsi_debug.c
>> @@ -3207,16 +3207,7 @@ static void do_remove_driverfs_files(void)
>>   	driver_remove_file(&sdebug_driverfs_driver,&driver_attr_add_host);
>>   }
>>
>> -static void pseudo_0_release(struct device *dev)
>> -{
>> -	if (SCSI_DEBUG_OPT_NOISE&  scsi_debug_opts)
>> -		printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
>> -}
>> -
>> -static struct device pseudo_primary = {
>> -	.init_name	= "pseudo_0",
>> -	.release	= pseudo_0_release,
>> -};
>> +struct device *pseudo_primary;
>>
>>   static int __init scsi_debug_init(void)
>>   {
>> @@ -3352,10 +3343,10 @@ static int __init scsi_debug_init(void)
>>   			map_region(0, 2);
>>   	}
>>
>> -	ret = device_register(&pseudo_primary);
>> -	if (ret<  0) {
>> -		printk(KERN_WARNING "scsi_debug: device_register error: %d\n",
>> -			ret);
>> +	pseudo_primary = root_device_register("pseudo_0");
>> +	if (IS_ERR(pseudo_primary)) {
>> +		printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
>> +		ret = PTR_ERR(pseudo_primary);
>>   		goto free_vm;
>>   	}
>>   	ret = bus_register(&pseudo_lld_bus);
>> @@ -3402,7 +3393,7 @@ del_files:
>>   bus_unreg:
>>   	bus_unregister(&pseudo_lld_bus);
>>   dev_unreg:
>> -	device_unregister(&pseudo_primary);
>> +	root_device_unregister(pseudo_primary);
>>   free_vm:
>>   	if (map_storep)
>>   		vfree(map_storep);
>> @@ -3423,7 +3414,7 @@ static void __exit scsi_debug_exit(void)
>>   	do_remove_driverfs_files();
>>   	driver_unregister(&sdebug_driverfs_driver);
>>   	bus_unregister(&pseudo_lld_bus);
>> -	device_unregister(&pseudo_primary);
>> +	root_device_unregister(pseudo_primary);
>>
>>   	if (dif_storep)
>>   		vfree(dif_storep);
>> @@ -3474,7 +3465,7 @@ static int sdebug_add_adapter(void)
>>           spin_unlock(&sdebug_host_list_lock);
>>
>>           sdbg_host->dev.bus =&pseudo_lld_bus;
>> -        sdbg_host->dev.parent =&pseudo_primary;
>> +        sdbg_host->dev.parent = pseudo_primary;
>>           sdbg_host->dev.release =&sdebug_release_adapter;
>>           dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
>>
>> --
>> 1.5.6.5
>>
>

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