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

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Date:	Mon,  6 Sep 2010 17:24:28 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Richard Sharpe <realrichardsharpe@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	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>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH v3] scsi_debug: Convert to use root_device_register() and root_device_unregister()

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>
---
 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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