[PATCH] fbdev/xilinxfb: Fix improper casting and tighen up probe path

[John Linn]

> -----Original Message-----
> From: Grant Likely [mailto:grant.likely at secretlab.ca]
> Sent: Friday, June 12, 2009 11:57 AM
> To: linuxppc-dev at ozlabs.org; linux-kernel at vger.kernel.org;
benh at kernel.crashing.org; John Linn
> Subject: [PATCH] fbdev/xilinxfb: Fix improper casting and tighen up
probe path
> 
> From: Grant Likely <grant.likely at secretlab.ca>
> 
> The xilinxfb driver is improperly casting a physical address to a
> u32, and the probe routine isn't as straight forward as it could be.
> (discovered by gcc spitting out warnings on most recent change to
> xilinxfb driver).
> 
> This patch fixes the cast and simplifies the probe path.
> 
> Signed-off-by: Grant Likely <grant.likely at secretlab.ca>
> ---
> 
> John, can you please test and verify this fix is correct?

I will try to test it today.

-- John

> 
> Thanks,
> g.
> 
>  drivers/video/xilinxfb.c |   59
++++++++++++++++++----------------------------
>  1 files changed, 23 insertions(+), 36 deletions(-)
> 
> 
> diff --git a/drivers/video/xilinxfb.c b/drivers/video/xilinxfb.c
> index 7a868bd..b68b331 100644
> --- a/drivers/video/xilinxfb.c
> +++ b/drivers/video/xilinxfb.c
> @@ -124,7 +124,6 @@ struct xilinxfb_drvdata {
>  						registers */
> 
>  	dcr_host_t      dcr_host;
> -	unsigned int    dcr_start;
>  	unsigned int    dcr_len;
> 
>  	void		*fb_virt;	/* virt. address of the frame
buffer */
> @@ -325,8 +324,8 @@ static int xilinxfb_assign(struct device *dev,
>  					drvdata->regs);
>  	}
>  	/* Put a banner in the log (for DEBUG) */
> -	dev_dbg(dev, "fb: phys=%p, virt=%p, size=%x\n",
> -		(void *)drvdata->fb_phys, drvdata->fb_virt, fbsize);
> +	dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n",
> +		(unsigned long long)drvdata->fb_phys, drvdata->fb_virt,
fbsize);
> 
>  	return 0;	/* success */
> 
> @@ -404,9 +403,7 @@ xilinxfb_of_probe(struct of_device *op, const
struct of_device_id *match)
>  	u32 tft_access;
>  	struct xilinxfb_platform_data pdata;
>  	struct resource res;
> -	int size, rc;
> -	int start = 0, len = 0;
> -	dcr_host_t dcr_host;
> +	int size, rc, start;
>  	struct xilinxfb_drvdata *drvdata;
> 
>  	/* Copy with the default pdata (not a ptr reference!) */
> @@ -414,35 +411,39 @@ xilinxfb_of_probe(struct of_device *op, const
struct of_device_id *match)
> 
>  	dev_dbg(&op->dev, "xilinxfb_of_probe(%p, %p)\n", op, match);
> 
> +	/* Allocate the driver data region */
> +	drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
> +	if (!drvdata) {
> +		dev_err(&op->dev, "Couldn't allocate device private
record\n");
> +		return -ENOMEM;
> +	}
> +
>  	/*
>  	 * To check whether the core is connected directly to DCR or PLB
>  	 * interface and initialize the tft_access accordingly.
>  	 */
>  	p = (u32 *)of_get_property(op->node, "xlnx,dcr-splb-slave-if",
NULL);
> -
> -	if (p)
> -		tft_access = *p;
> -	else
> -		tft_access = 0;		/* For backward compatibility */
> +	tft_access = p ? *p : 0;
> 
>  	/*
>  	 * Fill the resource structure if its direct PLB interface
>  	 * otherwise fill the dcr_host structure.
>  	 */
>  	if (tft_access) {
> +		drvdata->flags |= PLB_ACCESS_FLAG;
>  		rc = of_address_to_resource(op->node, 0, &res);
>  		if (rc) {
>  			dev_err(&op->dev, "invalid address\n");
> -			return -ENODEV;
> +			goto err;
>  		}
> -
>  	} else {
> +		res.start = 0;
>  		start = dcr_resource_start(op->node, 0);
> -		len = dcr_resource_len(op->node, 0);
> -		dcr_host = dcr_map(op->node, start, len);
> -		if (!DCR_MAP_OK(dcr_host)) {
> -			dev_err(&op->dev, "invalid address\n");
> -			return -ENODEV;
> +		drvdata->dcr_len = dcr_resource_len(op->node, 0);
> +		drvdata->dcr_host = dcr_map(op->node, start,
drvdata->len);
> +		if (!DCR_MAP_OK(drvdata->dcr_host)) {
> +			dev_err(&op->dev, "invalid DCR address\n");
> +			goto err;
>  		}
>  	}
> 
> @@ -467,26 +468,12 @@ xilinxfb_of_probe(struct of_device *op, const
struct of_device_id *match)
>  	if (of_find_property(op->node, "rotate-display", NULL))
>  		pdata.rotate_screen = 1;
> 
> -	/* Allocate the driver data region */
> -	drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
> -	if (!drvdata) {
> -		dev_err(&op->dev, "Couldn't allocate device private
record\n");
> -		return -ENOMEM;
> -	}
>  	dev_set_drvdata(&op->dev, drvdata);
> +	return xilinxfb_assign(&op->dev, drvdata, res.start, &pdata);
> 
> -	if (tft_access)
> -		drvdata->flags |= PLB_ACCESS_FLAG;
> -
> -	/* Arguments are passed based on the interface */
> -	if (drvdata->flags & PLB_ACCESS_FLAG) {
> -		return xilinxfb_assign(&op->dev, drvdata, res.start,
&pdata);
> -	} else {
> -		drvdata->dcr_start = start;
> -		drvdata->dcr_len = len;
> -		drvdata->dcr_host = dcr_host;
> -		return xilinxfb_assign(&op->dev, drvdata, 0, &pdata);
> -	}
> + err:
> +	kfree(drvdata);
> +	return -ENODEV;
>  }
> 
>  static int __devexit xilinxfb_of_remove(struct of_device *op)
> 


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