[media] drivers/media/usb/{s2255drv.c, tm6000/tm6000-alsa.c, tm6000/tm6000-input...

If the NULL test is necessary, the initialization involving a dereference of
the tested value should be moved after the NULL test.

The sematic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c
index 6c7960c..a25513d 100644 (file)
--- a/drivers/media/usb/s2255/s2255drv.c
+++ b/drivers/media/usb/s2255/s2255drv.c
@@ -1861,11 +1861,12 @@ static int s2255_release(struct file *file)
 static int s2255_mmap_v4l(struct file *file, struct vm_area_struct *vma)
 {
        struct s2255_fh *fh = file->private_data;
-       struct s2255_dev *dev = fh->dev;
+       struct s2255_dev *dev;
        int ret;
 
        if (!fh)
                return -ENODEV;
+       dev = fh->dev;
        dprintk(4, "%s, vma=0x%08lx\n", __func__, (unsigned long)vma);
        if (mutex_lock_interruptible(&dev->lock))
                return -ERESTARTSYS;

diff --git a/drivers/media/usb/tm6000/tm6000-alsa.c b/drivers/media/usb/tm6000/tm6000-alsa.c
index bd07ec7..813c1ec 100644 (file)
--- a/drivers/media/usb/tm6000/tm6000-alsa.c
+++ b/drivers/media/usb/tm6000/tm6000-alsa.c
@@ -487,10 +487,11 @@ error:
 
 static int tm6000_audio_fini(struct tm6000_core *dev)
 {
-       struct snd_tm6000_card  *chip = dev->adev;
+       struct snd_tm6000_card *chip;
 
        if (!dev)
                return 0;
+       chip = dev->adev;
 
        if (!chip)
                return 0;

diff --git a/drivers/media/usb/tm6000/tm6000-input.c b/drivers/media/usb/tm6000/tm6000-input.c
index e80b7e1..dffbd4b 100644 (file)
--- a/drivers/media/usb/tm6000/tm6000-input.c
+++ b/drivers/media/usb/tm6000/tm6000-input.c
@@ -319,12 +319,13 @@ static int tm6000_ir_change_protocol(struct rc_dev *rc, u64 rc_type)
 static int __tm6000_ir_int_start(struct rc_dev *rc)
 {
        struct tm6000_IR *ir = rc->priv;
-       struct tm6000_core *dev = ir->dev;
+       struct tm6000_core *dev;
        int pipe, size;
        int err = -ENOMEM;
 
        if (!ir)
                return -ENODEV;
+       dev = ir->dev;
 
        dprintk(2, "%s\n",__func__);