Linux Virtualization - Apr 2009 - [PATCH] xen block: remove driver_data direct access of struct device

From: Greg Kroah-Hartman <gregkh at suse.de>

In the near future, the driver core is going to not allow direct access
to the driver_data pointer in struct device.  Instead, the functions
dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
have been around since the beginning, so are backwards compatible with
all older kernel versions.


Cc: xen-devel at lists.xensource.com
Cc: virtualization at lists.osdl.org
Cc: Chris Wright <chrisw at sous-sol.org>
Cc: Jeremy Fitzhardinge <jeremy at xensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
 drivers/block/xen-blkfront.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -755,12 +755,12 @@ static int blkfront_probe(struct xenbus_
 
 	/* Front end dir is a number, which is used as the id. */
 	info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1,
NULL, 0);
-	dev->dev.driver_data = info;
+	dev_det_drvdata(&dev->dev, info);
 
 	err = talk_to_backend(dev, info);
 	if (err) {
 		kfree(info);
-		dev->dev.driver_data = NULL;
+		dev_det_drvdata(&dev->dev, NULL);
 		return err;
 	}
 
@@ -845,7 +845,7 @@ static int blkif_recover(struct blkfront
  */
 static int blkfront_resume(struct xenbus_device *dev)
 {
-	struct blkfront_info *info = dev->dev.driver_data;
+	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 	int err;
 
 	dev_dbg(&dev->dev, "blkfront_resume: %s\n",
dev->nodename);
@@ -924,7 +924,7 @@ static void blkfront_connect(struct blkf
  */
 static void blkfront_closing(struct xenbus_device *dev)
 {
-	struct blkfront_info *info = dev->dev.driver_data;
+	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 	unsigned long flags;
 
 	dev_dbg(&dev->dev, "blkfront_closing: %s removed\n",
dev->nodename);
@@ -959,7 +959,7 @@ static void blkfront_closing(struct xenb
 static void backend_changed(struct xenbus_device *dev,
 			    enum xenbus_state backend_state)
 {
-	struct blkfront_info *info = dev->dev.driver_data;
+	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 	struct block_device *bd;
 
 	dev_dbg(&dev->dev, "blkfront:backend_changed.\n");
@@ -997,7 +997,7 @@ static void backend_changed(struct xenbu
 
 static int blkfront_remove(struct xenbus_device *dev)
 {
-	struct blkfront_info *info = dev->dev.driver_data;
+	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 
 	dev_dbg(&dev->dev, "blkfront_remove: %s removed\n",
dev->nodename);
 
@@ -1010,7 +1010,7 @@ static int blkfront_remove(struct xenbus
 
 static int blkfront_is_ready(struct xenbus_device *dev)
 {
-	struct blkfront_info *info = dev->dev.driver_data;
+	struct blkfront_info *info = dev_get_drvdata(&dev->dev);
 
 	return info->is_ready;
 }

* Greg Kroah-Hartman (gregkh at suse.de) wrote:
> In the near future, the driver core is going to not allow direct access
> to the driver_data pointer in struct device.  Instead, the functions
> dev_get_drvdata() and dev_set_drvdata() should be used.  These functions
> have been around since the beginning, so are backwards compatible with
> all older kernel versions.
> 
> Cc: xen-devel at lists.xensource.com
> Cc: virtualization at lists.osdl.org
> Cc: Chris Wright <chrisw at sous-sol.org>
> Cc: Jeremy Fitzhardinge <jeremy at xensource.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
Acked-by: Chris Wright <chrisw at sous-sol.org>

after...
> -		dev->dev.driver_data = NULL;
> +		dev_det_drvdata(&dev->dev, NULL);
...fixing your fingers/script so it compiles ;-)

Chris Wright wrote:
> * Greg KH (greg at kroah.com) wrote:
>   
>> Thanks, will add it.  Any objections for this to go through my
>> driver-core tree to Linus for 2.6.31?
>>     
>
> None from me.
>   
Fine by me.

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com>

    J

On Thu, Apr 30, 2009 at 04:25:36PM -0700, Jeremy Fitzhardinge
wrote:
> Chris Wright wrote:
> > * Greg KH (greg at kroah.com) wrote:
> >   
> >> Thanks, will add it.  Any objections for this to go through my
> >> driver-core tree to Linus for 2.6.31?
> >>     
> >
> > None from me.
> >   
> 
> Fine by me.
> 
> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge at citrix.com>
Thanks, will add this ack and push it myself.

greg k-h