linux-kernel - [PATCH v2 26/31] staging/comedi/das16: Make timer initialization unconditional

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Message-Id: <1505950075-50223-27-git-send-email-keescook@chromium.org>
Date:   Wed, 20 Sep 2017 16:27:50 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>, Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 26/31] staging/comedi/das16: Make timer initialization unconditional

With timer initialization made unconditional, there is no reason to
make del_timer_sync() calls conditionally, there by removing the test
of the .data field.

Cc: Ian Abbott <abbotti@....co.uk>
Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devel@...verdev.osuosl.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/staging/comedi/drivers/das16.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index 5d157951f63f..2b2a446af3f5 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -934,6 +934,9 @@ static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
 {
 	struct das16_private_struct *devpriv = dev->private;
 
+	setup_timer(&devpriv->timer, das16_timer_interrupt,
+		    (unsigned long)dev);
+
 	/* only DMA channels 3 and 1 are valid */
 	if (!(dma_chan == 1 || dma_chan == 3))
 		return;
@@ -941,10 +944,6 @@ static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
 	/* DMA uses two buffers */
 	devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
 					   DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
-	if (devpriv->dma) {
-		setup_timer(&devpriv->timer, das16_timer_interrupt,
-			    (unsigned long)dev);
-	}
 }
 
 static void das16_free_dma(struct comedi_device *dev)
@@ -952,8 +951,7 @@ static void das16_free_dma(struct comedi_device *dev)
 	struct das16_private_struct *devpriv = dev->private;
 
 	if (devpriv) {
-		if (devpriv->timer.data)
-			del_timer_sync(&devpriv->timer);
+		del_timer_sync(&devpriv->timer);
 		comedi_isadma_free(devpriv->dma);
 	}
 }
-- 
2.7.4