linux-kernel - [PATCH 03/14] DMAENGINE: ste_dma40: No need reading, masking and setting a set register

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Message-ID: <1281355674-13105-1-git-send-email-linus.walleij@stericsson.com>
Date:	Mon, 9 Aug 2010 14:07:54 +0200
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	<linux-kernel@...r.kernel.org>,
	Jonas Aaberg <jonas.aberg@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 03/14] DMAENGINE: ste_dma40: No need reading, masking and setting a set register

From: Jonas Aaberg <jonas.aberg@...ricsson.com>

Removes an unnecessary register read and a few lines of code.

Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
 drivers/dma/ste_dma40.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 8aff865..538c35d 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -915,7 +915,6 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
 
 	int i;
 	u32 regs[ARRAY_SIZE(il)];
-	u32 tmp;
 	u32 idx;
 	u32 row;
 	long chan = -1;
@@ -942,9 +941,7 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
 		idx = chan & (BITS_PER_LONG - 1);
 
 		/* ACK interrupt */
-		tmp = readl(base->virtbase + il[row].clr);
-		tmp |= 1 << idx;
-		writel(tmp, base->virtbase + il[row].clr);
+		writel(1 << idx, base->virtbase + il[row].clr);
 
 		if (il[row].offset == D40_PHY_CHAN)
 			d40c = base->lookup_phy_chans[idx];
-- 
1.6.3.3

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