linux-kernel - [PATCH RESEND 2/3] mfd: da903x: Ensure setting bits if new value is different from the old value

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Message-ID: <1324295870.3350.4.camel@phoenix>
Date:	Mon, 19 Dec 2011 19:57:50 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mike Rapoport <mike@...pulab.co.il>,
	Eric Miao <eric.y.miao@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH RESEND 2/3] mfd: da903x: Ensure setting bits if new value is
 different from the old value

It does not make sense to write new value only when all the bit_mask
bits are zero.
We need to write new value if the bit mask fields of new value is
not equal to old value.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/mfd/da903x.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/mfd/da903x.c b/drivers/mfd/da903x.c
index 62ce685..1924b85 100644
--- a/drivers/mfd/da903x.c
+++ b/drivers/mfd/da903x.c
@@ -182,7 +182,7 @@ int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 	if (ret)
 		goto out;
 
-	if ((reg_val & bit_mask) == 0) {
+	if ((reg_val & bit_mask) != bit_mask) {
 		reg_val |= bit_mask;
 		ret = __da903x_write(chip->client, reg, reg_val);
 	}
-- 
1.7.5.4



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