V4L/DVB: V4L2: Replace loops for finding max buffers in VIDIOC_REQBUFS callbacks

Due to obvious copy and paste coding a number of video capture drivers
which implement a limit on the buffer memory decremented the user
supplied buffer count in a while loop until it reaches an acceptable
value.

This is a silly thing to do when the maximum value can be directly
computed.

Signed-off-by: Andreas Bombe <aeb@debian.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

11 files changed, 22 insertions, 22 deletions

diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index f4860f03dfc3..350e7af75884 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -1806,8 +1806,8 @@ buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
         *size = fh->fmt->depth*fh->width*fh->height >> 3;
         if (0 == *count)
                 *count = gbuffers;
-        while (*size * *count > gbuffers * gbufsize)
-                (*count)--;
+        if (*size * *count > gbuffers * gbufsize)
+                *count = (gbuffers * gbufsize) / *size;
         return 0;
 }
 
diff --git a/drivers/media/video/cx23885/cx23885-video.c b/drivers/media/video/cx23885/cx23885-video.c
index 2d3ac8b83dc3..543b854f6a62 100644
--- a/drivers/media/video/cx23885/cx23885-video.c
+++ b/drivers/media/video/cx23885/cx23885-video.c
@@ -514,8 +514,8 @@ static int buffer_setup(struct videobuf_queue *q, unsigned int *count,
         *size = fh->fmt->depth*fh->width*fh->height >> 3;
         if (0 == *count)
                 *count = 32;
-        while (*size * *count > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
         return 0;
 }
 
diff --git a/drivers/media/video/cx88/cx88-video.c b/drivers/media/video/cx88/cx88-video.c
index 8e414f7aa76e..0a3849c710f8 100644
--- a/drivers/media/video/cx88/cx88-video.c
+++ b/drivers/media/video/cx88/cx88-video.c
@@ -561,8 +561,8 @@ buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
         *size = fh->fmt->depth*fh->width*fh->height >> 3;
         if (0 == *count)
                 *count = 32;
-        while (*size * *count > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
         return 0;
 }
 
diff --git a/drivers/media/video/mx1_camera.c b/drivers/media/video/mx1_camera.c
index 34a66019190e..5c17f9ec3d7c 100644
--- a/drivers/media/video/mx1_camera.c
+++ b/drivers/media/video/mx1_camera.c
@@ -139,8 +139,8 @@ static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
         if (!*count)
                 *count = 32;
 
-        while (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
+                *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
 
         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 
diff --git a/drivers/media/video/omap24xxcam.c b/drivers/media/video/omap24xxcam.c
index ce76d952e161..f85b2ed8a2d8 100644
--- a/drivers/media/video/omap24xxcam.c
+++ b/drivers/media/video/omap24xxcam.c
@@ -452,8 +452,8 @@ static int omap24xxcam_vbq_setup(struct videobuf_queue *vbq, unsigned int *cnt,
         *size = fh->pix.sizeimage;
 
         /* accessing fh->cam->capture_mem is ok, it's constant */
-        while (*size * *cnt > fh->cam->capture_mem)
-                (*cnt)--;
+        if (*size * *cnt > fh->cam->capture_mem)
+                *cnt = fh->cam->capture_mem / *size;
 
         return 0;
 }
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index 04bf5c11308d..7fe70e718656 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -253,8 +253,8 @@ static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 
         if (0 == *count)
                 *count = 32;
-        while (*size * *count > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
 
         return 0;
 }
diff --git a/drivers/media/video/s2255drv.c b/drivers/media/video/s2255drv.c
index 0092ff52bb27..5ecd41b3bf3e 100644
--- a/drivers/media/video/s2255drv.c
+++ b/drivers/media/video/s2255drv.c
@@ -702,8 +702,8 @@ static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
         if (0 == *count)
                 *count = S2255_DEF_BUFS;
 
-        while (*size * (*count) > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
 
         return 0;
 }
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c
index 7a229ebe6923..9a46f0a0c1bb 100644
--- a/drivers/media/video/sh_mobile_ceu_camera.c
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -213,8 +213,8 @@ static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
                 *count = 2;
 
         if (pcdev->video_limit) {
-                while (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
-                        (*count)--;
+                if (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
+                        *count = pcdev->video_limit / PAGE_ALIGN(*size);
         }
 
         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index cdbe70385c12..5a736b8a5a33 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -749,8 +749,8 @@ buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
         if (0 == *count)
                 *count = 32;
 
-        while (*size * *count > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
 
         dprintk(dev, 1, "%s, count=%d, size=%d\n", __func__,
                 *count, *size);
diff --git a/drivers/media/video/zr364xx.c b/drivers/media/video/zr364xx.c
index 3d4bac252902..a82b5bd18d26 100644
--- a/drivers/media/video/zr364xx.c
+++ b/drivers/media/video/zr364xx.c
@@ -376,8 +376,8 @@ static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
         if (*count == 0)
                 *count = ZR364XX_DEF_BUFS;
 
-        while (*size * (*count) > ZR364XX_DEF_BUFS * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > ZR364XX_DEF_BUFS * 1024 * 1024)
+                *count = (ZR364XX_DEF_BUFS * 1024 * 1024) / *size;
 
         return 0;
 }
diff --git a/drivers/staging/cx25821/cx25821-video.c b/drivers/staging/cx25821/cx25821-video.c
index 91e0db2e37f9..a3bea2739cef 100644
--- a/drivers/staging/cx25821/cx25821-video.c
+++ b/drivers/staging/cx25821/cx25821-video.c
@@ -516,8 +516,8 @@ int cx25821_buffer_setup(struct videobuf_queue *q, unsigned int *count,
         if (0 == *count)
                 *count = 32;
 
-        while (*size * *count > vid_limit * 1024 * 1024)
-                (*count)--;
+        if (*size * *count > vid_limit * 1024 * 1024)
+                *count = (vid_limit * 1024 * 1024) / *size;
 
         return 0;
 }