linux-kernel - [PATCH 04/24] staging: comedi: Remove NULL check before kfree

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Message-Id: <1299994157-11191-5-git-send-email-imirkin@alum.mit.edu>
Date:	Sun, 13 Mar 2011 00:28:57 -0500
From:	Ilia Mirkin <imirkin@...m.mit.edu>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/24] staging: comedi: Remove NULL check before kfree

This patch was generated by the following semantic patch:
// <smpl>
@@ expression E; @@
- if (E != NULL) { kfree(E); }
+ kfree(E);

@@ expression E; @@
- if (E != NULL) { kfree(E); E = NULL; }
+ kfree(E);
+ E = NULL;
// </smpl>

Signed-off-by: Ilia Mirkin <imirkin@...m.mit.edu>
---
 drivers/staging/comedi/drivers/8255.c        |    9 +--------
 drivers/staging/comedi/drivers/das16.c       |    6 ++----
 drivers/staging/comedi/drivers/ni_at_a2150.c |    3 +--
 drivers/staging/comedi/drivers/ni_labpc.c    |    3 +--
 drivers/staging/comedi/drivers/serial2002.c  |    8 ++------
 drivers/staging/comedi/drivers/usbdux.c      |    8 ++------
 6 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/drivers/staging/comedi/drivers/8255.c b/drivers/staging/comedi/drivers/8255.c
index 95049a8..6c26ac8 100644
--- a/drivers/staging/comedi/drivers/8255.c
+++ b/drivers/staging/comedi/drivers/8255.c
@@ -383,14 +383,7 @@ EXPORT_SYMBOL(subdev_8255_init_irq);
 
 void subdev_8255_cleanup(struct comedi_device *dev, struct comedi_subdevice *s)
 {
-	if (s->private) {
-		/* this test does nothing, so comment it out
-		 * if (subdevpriv->have_irq) {
-		 * }
-		 */
-
-		kfree(s->private);
-	}
+	kfree(s->private);
 }
 EXPORT_SYMBOL(subdev_8255_cleanup);
 
diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index 0af1b46..e7905ba 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -1695,10 +1695,8 @@ static int das16_detach(struct comedi_device *dev)
 		}
 		if (devpriv->dma_chan)
 			free_dma(devpriv->dma_chan);
-		if (devpriv->user_ai_range_table)
-			kfree(devpriv->user_ai_range_table);
-		if (devpriv->user_ao_range_table)
-			kfree(devpriv->user_ao_range_table);
+		kfree(devpriv->user_ai_range_table);
+		kfree(devpriv->user_ao_range_table);
 	}
 
 	if (dev->irq)
diff --git a/drivers/staging/comedi/drivers/ni_at_a2150.c b/drivers/staging/comedi/drivers/ni_at_a2150.c
index e46d62b..4d0053e 100644
--- a/drivers/staging/comedi/drivers/ni_at_a2150.c
+++ b/drivers/staging/comedi/drivers/ni_at_a2150.c
@@ -479,8 +479,7 @@ static int a2150_detach(struct comedi_device *dev)
 	if (devpriv) {
 		if (devpriv->dma)
 			free_dma(devpriv->dma);
-		if (devpriv->dma_buffer)
-			kfree(devpriv->dma_buffer);
+		kfree(devpriv->dma_buffer);
 	}
 
 	return 0;
diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index 0728c3c..241fe52 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -797,8 +797,7 @@ int labpc_common_detach(struct comedi_device *dev)
 		subdev_8255_cleanup(dev, dev->subdevices + 2);
 
 	/* only free stuff if it has been allocated by _attach */
-	if (devpriv->dma_buffer)
-		kfree(devpriv->dma_buffer);
+	kfree(devpriv->dma_buffer);
 	if (devpriv->dma_chan)
 		free_dma(devpriv->dma_chan);
 	if (dev->irq)
diff --git a/drivers/staging/comedi/drivers/serial2002.c b/drivers/staging/comedi/drivers/serial2002.c
index c9be9e0..ebfce33 100644
--- a/drivers/staging/comedi/drivers/serial2002.c
+++ b/drivers/staging/comedi/drivers/serial2002.c
@@ -907,12 +907,8 @@ static int serial2002_detach(struct comedi_device *dev)
 	printk("comedi%d: serial2002: remove\n", dev->minor);
 	for (i = 0; i < 5; i++) {
 		s = &dev->subdevices[i];
-		if (s->maxdata_list) {
-			kfree(s->maxdata_list);
-		}
-		if (s->range_table_list) {
-			kfree(s->range_table_list);
-		}
+		kfree(s->maxdata_list);
+		kfree(s->range_table_list);
 	}
 	return 0;
 }
diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c
index 696ee04..be93c30 100644
--- a/drivers/staging/comedi/drivers/usbdux.c
+++ b/drivers/staging/comedi/drivers/usbdux.c
@@ -2265,12 +2265,8 @@ static void tidy_up(struct usbduxsub *usbduxsub_tmp)
 			usbduxsub_unlink_OutURBs(usbduxsub_tmp);
 		}
 		for (i = 0; i < usbduxsub_tmp->numOfOutBuffers; i++) {
-			if (usbduxsub_tmp->urbOut[i]->transfer_buffer) {
-				kfree(usbduxsub_tmp->
-				      urbOut[i]->transfer_buffer);
-				usbduxsub_tmp->urbOut[i]->transfer_buffer =
-				    NULL;
-			}
+			kfree(usbduxsub_tmp->urbOut[i]->transfer_buffer);
+			usbduxsub_tmp->urbOut[i]->transfer_buffer = NULL;
 			if (usbduxsub_tmp->urbOut[i]) {
 				usb_kill_urb(usbduxsub_tmp->urbOut[i]);
 				usb_free_urb(usbduxsub_tmp->urbOut[i]);
-- 
1.7.3.4

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