From: Himangi Saraogi <himangi774@gmail.com>
To: Mauro Carvalho Chehab <m.chehab@samsung.com>,
linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: julia.lawall@lip6.fr
Subject: [PATCH] saa7164-dvb: Remove unnecessary null test
Date: Wed, 16 Jul 2014 02:59:53 +0530 [thread overview]
Message-ID: <20140715212953.GA28003@himangi-Dell> (raw)
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 <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
---
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
reply other threads:[~2014-07-15 21:30 UTC|newest]
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