linux-kernel - Re: [PATCH 1/2 v4] Driver for Freescale 8610 and 5121 DIU

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Date:	Fri, 28 Mar 2008 12:30:29 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	York Sun <yorksun@...escale.com>
CC:	linux-fbdev-devel@...ts.sourceforge.net, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	galak@...nel.crashing.org, a.p.zijlstra@...llo.nl,
	Timur Tabi <timur@...escale.com>
Subject: Re: [PATCH 1/2 v4] Driver for Freescale 8610 and 5121 DIU

York Sun wrote:
> +static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
> +		       unsigned long arg)
> +{
> +	struct mfb_info *mfbi = info->par;
> +	struct diu_ad *ad = mfbi->ad;
> +	struct mfb_chroma_key ck;
> +	unsigned char global_alpha;
> +	struct aoi_display_offset aoi_d;
> +	__u32 pix_fmt;
> +
> +	switch (cmd) {
> +	case MFB_SET_PIXFMT:
> +		if (!arg)
> +			return -EINVAL;
> +		if (copy_from_user(&pix_fmt, (void __user *)arg,
> +				sizeof(pix_fmt)))

OK, you fixed the cast here...

> +			return -EFAULT;
> +		ad->pix_fmt = pix_fmt;
> +		pr_debug("Set pixel format to 0x%08x\n", ad->pix_fmt);
> +		break;
> +	case MFB_GET_PIXFMT:
> +		if (!arg)
> +			return -EINVAL;
> +		pix_fmt = ad->pix_fmt;
> +		if (copy_to_user((void *)arg, &pix_fmt, sizeof(pix_fmt)))
> +			return -EFAULT;
> +		pr_debug("get pixel format 0x%08x\n", ad->pix_fmt);
> +		break;
> +	case MFB_SET_AOID:
> +		if (!arg)
> +			return -EINVAL;
> +		if (copy_from_user(&aoi_d, (void *)arg, sizeof(aoi_d)))
> +			return -EFAULT;

...but not anywhere else.  All user pointers should have a __user 
annotation.

> +	default:
> +		printk(KERN_ERR "Unknown ioctl command (0x%08X)\n", cmd);
> +		return 0;

return -ENOIOCTLCMD;

> +	/* Read to clear the status */
> +	status = in_be32(&(hw->int_status));
> +
> +	ret = request_irq(irq, fsl_diu_isr, 0, "diu", 0);
> +	if (ret)
> +		pr_info("Request diu IRQ failed.\n");
> +	else {
> +		ints = INT_PARERR | INT_LS_BF_VS;
> +#if !defined(CONFIG_NOT_COHERENT_CACHE)
> +		ints |=	INT_VSYNC;
> +#endif
> +		if (dr.mode == MFB_MODE2 || dr.mode == MFB_MODE3)
> +			ints |= INT_VSYNC_WB;
> +
> +		/* Read to clear the status */
> +		status = in_be32(&(hw->int_status));
> +		out_be32(&(hw->int_mask), ints);

These parentheses are unnecessary; just do &hw->int_mask, etc.

-Scott
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