PWN-Hunter/android_kernel_xiaomi_sdm845
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V4L/DVB: s2255drv: removal of big kernel lock

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big kernel lock removed from open function.
v4l2 code does not require locking the open function except
to check asynchronous firmware load state, which is protected
by a mutex

Signed-off-by: Dean Anderson <dean@sensoray.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Dean Anderson 2010-04-08 23:46:08 -03:00 committed by Mauro Carvalho Chehab
parent c0a2ec956d
commit a5ef91c9a5
1 changed files with 1 additions and 10 deletions
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11
drivers/media/video/s2255drv.c
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@ -1753,7 +1753,6 @@ static int s2255_open(struct file *file)
int state;
dprintk(1, "s2255: open called (dev=%s)\n",
video_device_node_name(vdev));
lock_kernel();
for (i = 0; i < MAX_CHANNELS; i++)
if (&dev->vdev[i] == vdev) {
cur_channel = i;
@ -1769,7 +1768,6 @@ static int s2255_open(struct file *file)
switch (state) {
case S2255_FW_DISCONNECTING:
mutex_unlock(&dev->open_lock);
unlock_kernel();
return -ENODEV;
case S2255_FW_FAILED:
s2255_dev_err(&dev->udev->dev,
@ -1809,30 +1807,24 @@ static int s2255_open(struct file *file)
break;
case S2255_FW_FAILED:
printk(KERN_INFO "2255 firmware load failed.\n");
unlock_kernel();
return -ENODEV;
case S2255_FW_DISCONNECTING:
printk(KERN_INFO "%s: disconnecting\n", __func__);
unlock_kernel();
return -ENODEV;
case S2255_FW_LOADED_DSPWAIT:
case S2255_FW_NOTLOADED:
printk(KERN_INFO "%s: firmware not loaded yet"
"please try again later\n",
__func__);
unlock_kernel();
return -EAGAIN;
default:
printk(KERN_INFO "%s: unknown state\n", __func__);
unlock_kernel();
return -EFAULT;
}
/* allocate + initialize per filehandle data */
fh = kzalloc(sizeof(*fh), GFP_KERNEL);
if (NULL == fh) {
unlock_kernel();
if (NULL == fh)
return -ENOMEM;
}
file->private_data = fh;
fh->dev = dev;
fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@ -1860,7 +1852,6 @@ static int s2255_open(struct file *file)
fh->type,
V4L2_FIELD_INTERLACED,
sizeof(struct s2255_buffer), fh);
unlock_kernel();
return 0;
}