This patch removes the null test on dvb. dvb is initialized at the
beginning of the function to &port->dvb. Since port is dereferenced
prior to the null test, port must be a valid pointer, and
&port->dvb cannot be null.
The following Coccinelle script is used for detecting the change:
@r@
expression e,f;
identifier g,y;
statement S1,S2;
@@
*e = &f->g
<+...
f->y
...+>
*if (e != NULL || ...)
S1 else S2
Signed-off-by: Himangi Saraogi <[email protected]>
Acked-by: Julia Lawall <[email protected]>
---
drivers/media/pci/saa7164/saa7164-dvb.c | 32 ++++++++++++++------------------
1 file changed, 14 insertions(+), 18 deletions(-)
diff --git a/drivers/media/pci/saa7164/saa7164-dvb.c b/drivers/media/pci/saa7164/saa7164-dvb.c
index 5c5cc3e..16ae715 100644
--- a/drivers/media/pci/saa7164/saa7164-dvb.c
+++ b/drivers/media/pci/saa7164/saa7164-dvb.c
@@ -242,16 +242,14 @@ static int saa7164_dvb_start_feed(struct dvb_demux_feed *feed)
if (!demux->dmx.frontend)
return -EINVAL;
- if (dvb) {
- mutex_lock(&dvb->lock);
- if (dvb->feeding++ == 0) {
- /* Start transport */
- ret = saa7164_dvb_start_port(port);
- }
- mutex_unlock(&dvb->lock);
- dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
- __func__, port->nr, dvb->feeding);
+ mutex_lock(&dvb->lock);
+ if (dvb->feeding++ == 0) {
+ /* Start transport */
+ ret = saa7164_dvb_start_port(port);
}
+ mutex_unlock(&dvb->lock);
+ dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
+ __func__, port->nr, dvb->feeding);
return ret;
}
@@ -266,16 +264,14 @@ static int saa7164_dvb_stop_feed(struct dvb_demux_feed *feed)
dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
- if (dvb) {
- mutex_lock(&dvb->lock);
- if (--dvb->feeding == 0) {
- /* Stop transport */
- ret = saa7164_dvb_stop_streaming(port);
- }
- mutex_unlock(&dvb->lock);
- dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
- __func__, port->nr, dvb->feeding);
+ mutex_lock(&dvb->lock);
+ if (--dvb->feeding == 0) {
+ /* Stop transport */
+ ret = saa7164_dvb_stop_streaming(port);
}
+ mutex_unlock(&dvb->lock);
+ dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
+ __func__, port->nr, dvb->feeding);
return ret;
}
--
1.9.1