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Commit c777549f authored by Ian Armstrong's avatar Ian Armstrong Committed by Mauro Carvalho Chehab
Browse files

V4L/DVB (9163): ivtvfb: fix sparse warnings and improve write function 



Signed-off-by: default avatarIan Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent a8b86435

drivers/media/video/ivtv/ivtvfb.c

+37 −39
Original line number Diff line number Diff line
@@ -275,7 +275,6 @@ static int ivtvfb_prep_dec_dma_to_device(struct ivtv *itv, 
				  int size_in_bytes)

{

	DEFINE_WAIT(wait);

	int ret = 0;

	int got_sig = 0;



	mutex_lock(&itv->udma.lock);
@@ -316,7 +315,7 @@ static int ivtvfb_prep_dec_dma_to_device(struct ivtv *itv, 
		return -EINTR;

	}



	return ret;

	return 0;

}



static int ivtvfb_prep_frame(struct ivtv *itv, int cmd, void __user *source,
@@ -373,6 +372,7 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf, 
	unsigned long p = *ppos;

	void *dst;

	int err = 0;

	int dma_err;

	unsigned long total_size;

	struct ivtv *itv = (struct ivtv *) info->par;

	unsigned long dma_offset =
@@ -399,7 +399,6 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf, 
	if (count + p > total_size) {

		if (!err)

			err = -ENOSPC;



		count = total_size - p;

	}
@@ -408,13 +407,6 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf, 
	if (info->fbops->fb_sync)

		info->fbops->fb_sync(info);



	if (!access_ok(VERIFY_READ, buf, count)) {

		IVTVFB_WARN("Invalid userspace pointer 0x%08lx\n",

			(unsigned long)buf);

		err = -EFAULT;

	}



	if (!err) {

	/* If transfer size > threshold and both src/dst

	addresses are aligned, use DMA */

	if (count >= 4096 &&
@@ -422,7 +414,8 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf, 
		/* Odd address = can't DMA. Align */

		if ((unsigned long)dst & 3) {

			lead = 4 - ((unsigned long)dst & 3);

				memcpy(dst, buf, lead);

			if (copy_from_user(dst, buf, lead))

				return -EFAULT;

			buf += lead;

			dst += lead;

		}
@@ -431,16 +424,17 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf, 
			tail = (count - lead) & 3;

		/* DMA the data */

		dma_size = count - lead - tail;

			err = ivtvfb_prep_dec_dma_to_device(itv,

			       p + lead + dma_offset, (void *)buf, dma_size);

		dma_err = ivtvfb_prep_dec_dma_to_device(itv,

		       p + lead + dma_offset, (void __user *)buf, dma_size);

		if (dma_err)

			return dma_err;

		dst += dma_size;

		buf += dma_size;

		/* Copy any leftover data */

			if (tail)

				memcpy(dst, buf, tail);

		} else {

			memcpy(dst, buf, count);

		}

		if (tail && copy_from_user(dst, buf, tail))

			return -EFAULT;

	} else if (copy_from_user(dst, buf, count)) {

		return -EFAULT;

	}



	if  (!err)
@@ -463,9 +457,12 @@ static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long ar 
			vblank.flags = FB_VBLANK_HAVE_COUNT |FB_VBLANK_HAVE_VCOUNT |

					FB_VBLANK_HAVE_VSYNC;

			trace = read_reg(0x028c0) >> 16;

			if (itv->is_50hz && trace > 312) trace -= 312;

			else if (itv->is_60hz && trace > 262) trace -= 262;

			if (trace == 1) vblank.flags |= FB_VBLANK_VSYNCING;

			if (itv->is_50hz && trace > 312)

				trace -= 312;

			else if (itv->is_60hz && trace > 262)

				trace -= 262;

			if (trace == 1)

				vblank.flags |= FB_VBLANK_VSYNCING;

			vblank.count = itv->last_vsync_field;

			vblank.vcount = trace;

			vblank.hcount = 0;
@@ -476,7 +473,8 @@ static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long ar 


		case FBIO_WAITFORVSYNC:

			prepare_to_wait(&itv->vsync_waitq, &wait, TASK_INTERRUPTIBLE);

			if (!schedule_timeout(msecs_to_jiffies(50))) rc = -ETIMEDOUT;

			if (!schedule_timeout(msecs_to_jiffies(50)))

				rc = -ETIMEDOUT;

			finish_wait(&itv->vsync_waitq, &wait);

			return rc;