1 files changed, 22 insertions, 4 deletions

diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
index 6e39e253ce53..ace4ff9ea023 100644
--- a/drivers/media/video/bw-qcam.c
+++ b/drivers/media/video/bw-qcam.c
@@ -495,7 +495,7 @@ static void qc_set(struct qcam_device *q)
                 val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
                     q->transfer_scale;
         }
-        val = (val + val2 - 1) / val2;
+        val = DIV_ROUND_UP(val, val2);
         qc_command(q, 0x13);
         qc_command(q, val);
 
@@ -651,7 +651,7 @@ static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long l
         transperline = q->width * q->bpp;
         divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
             q->transfer_scale;
-        transperline = (transperline + divisor - 1) / divisor;
+        transperline = DIV_ROUND_UP(transperline, divisor);
 
         for (i = 0, yield = yieldlines; i < linestotrans; i++)
         {
@@ -894,10 +894,27 @@ static ssize_t qcam_read(struct file *file, char __user *buf,
         return len;
 }
 
+static int qcam_exclusive_open(struct inode *inode, struct file *file)
+{
+        struct video_device *dev = video_devdata(file);
+        struct qcam_device *qcam = (struct qcam_device *)dev;
+
+        return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0;
+}
+
+static int qcam_exclusive_release(struct inode *inode, struct file *file)
+{
+        struct video_device *dev = video_devdata(file);
+        struct qcam_device *qcam = (struct qcam_device *)dev;
+
+        clear_bit(0, &qcam->in_use);
+        return 0;
+}
+
 static const struct file_operations qcam_fops = {
         .owner          = THIS_MODULE,
-        .open           = video_exclusive_open,
-        .release        = video_exclusive_release,
+        .open           = qcam_exclusive_open,
+        .release        = qcam_exclusive_release,
         .ioctl          = qcam_ioctl,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = v4l_compat_ioctl32,
@@ -909,6 +926,7 @@ static struct video_device qcam_template=
 {
         .name           = "Connectix Quickcam",
         .fops           = &qcam_fops,
+        .release        = video_device_release_empty,
 };
 
 #define MAX_CAMS 4