From: jintao xu <jintao.xu@amlogic.com>
Date: Thu, 28 Nov 2019 06:24:40 +0000 (+0800)
Subject: v4lvideo: fix cat dev panic [1/1]
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5f0d38a6b7f8e7c74539e849bb35c594e1f57869;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

v4lvideo: fix cat dev panic [1/1]

PD#SWPL-17478

Problem:
cat /dev/video33 panic

Solution:
read return 0

Verify:
U212

Change-Id: Idcabf7eca7d99d020fb759261fd7f613da83b096
Signed-off-by: jintao xu <jintao.xu@amlogic.com>
---

diff --git a/drivers/amlogic/media/video_processor/v4lvideo/v4lvideo.c b/drivers/amlogic/media/video_processor/v4lvideo/v4lvideo.c
index acb973c69f8c..a8256244555a 100644
--- a/drivers/amlogic/media/video_processor/v4lvideo/v4lvideo.c
+++ b/drivers/amlogic/media/video_processor/v4lvideo/v4lvideo.c
@@ -544,6 +544,13 @@ static int vidioc_close(struct file *file)
 	return 0;
 }
 
+static ssize_t vidioc_read(struct file *file, char __user *data,
+			   size_t count, loff_t *ppos)
+{
+	pr_info("v4lvideo read\n");
+	return 0;
+}
+
 static int vidioc_querycap(struct file *file,
 			   void *priv,
 			   struct v4l2_capability *cap)
@@ -791,7 +798,7 @@ static const struct v4l2_file_operations v4lvideo_v4l2_fops = {
 	.owner = THIS_MODULE,
 	.open = vidioc_open,
 	.release = vidioc_close,
-	.read = vb2_fop_read,
+	.read = vidioc_read,
 	.poll = vb2_fop_poll,
 	.unlocked_ioctl = video_ioctl2,/* V4L2 ioctl handler */
 	.mmap = vb2_fop_mmap,