1 files changed, 5 insertions, 15 deletions

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 00c0f76b9b5..64b4fda08dd 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -655,8 +655,6 @@ static long __video_do_ioctl(struct file *file,
         if (cmd == VIDIOCGMBUF) {
                 struct video_mbuf *p = arg;
 
-                memset(p, 0, sizeof(*p));
-
                 if (!ops->vidiocgmbuf)
                         return ret;
                 ret = ops->vidiocgmbuf(file, fh, p);
@@ -683,7 +681,6 @@ static long __video_do_ioctl(struct file *file,
         case VIDIOC_QUERYCAP:
         {
                 struct v4l2_capability *cap = (struct v4l2_capability *)arg;
-                memset(cap, 0, sizeof(*cap));
 
                 if (!ops->vidioc_querycap)
                         break;
@@ -1367,7 +1364,6 @@ static long __video_do_ioctl(struct file *file,
                 if (!ops->vidioc_g_audio)
                         break;
 
-                memset(p, 0, sizeof(*p));
                 ret = ops->vidioc_g_audio(file, fh, p);
                 if (!ret)
                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
@@ -1409,7 +1405,7 @@ static long __video_do_ioctl(struct file *file,
 
                 if (!ops->vidioc_g_audout)
                         break;
-                dbgarg(cmd, "Enum for index=%d\n", p->index);
+
                 ret = ops->vidioc_g_audout(file, fh, p);
                 if (!ret)
                         dbgarg2("index=%d, name=%s, capability=%d, "
@@ -1506,8 +1502,6 @@ static long __video_do_ioctl(struct file *file,
                 if (!ops->vidioc_g_jpegcomp)
                         break;
 
-                memset(p, 0, sizeof(*p));
-
                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
                 if (!ret)
                         dbgarg(cmd, "quality=%d, APPn=%d, "
@@ -1873,13 +1867,7 @@ long video_ioctl2(struct file *file,
                        cmd == VIDIOC_TRY_EXT_CTRLS);
 
         /*  Copy arguments into temp kernel buffer  */
-        switch (_IOC_DIR(cmd)) {
-        case _IOC_NONE:
-                parg = NULL;
-                break;
-        case _IOC_READ:
-        case _IOC_WRITE:
-        case (_IOC_WRITE | _IOC_READ):
+        if (_IOC_DIR(cmd) != _IOC_NONE) {
                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
                         parg = sbuf;
                 } else {
@@ -1900,8 +1888,10 @@ long video_ioctl2(struct file *file,
                         /* zero out anything we don't copy from userspace */
                         if (n < _IOC_SIZE(cmd))
                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
+                } else {
+                        /* read-only ioctl */
+                        memset(parg, 0, _IOC_SIZE(cmd));
                 }
-                break;
         }
 
         if (is_ext_ctrl) {