linux-kernel - [PATCH] mfd: twl4030: clarify the return value for read and write

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Message-Id: <1259760678-18707-1-git-send-email-amit.kucheria@verdurent.com>
Date:	Wed,  2 Dec 2009 15:31:18 +0200
From:	Amit Kucheria <amit.kucheria@...durent.com>
To:	List Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	List Linux Omap <linux-omap@...r.kernel.org>
Subject: [PATCH] mfd: twl4030: clarify the return value for read and write

We should be checking if all the messages were tranferred or not. Currently we
return success even if none of messages were transferred successfully.

Signed-off-by: Amit Kucheria <amit.kucheria@...durent.com>
---
 drivers/mfd/twl4030-core.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
index cf462b9..6ace378 100644
--- a/drivers/mfd/twl4030-core.c
+++ b/drivers/mfd/twl4030-core.c
@@ -298,10 +298,12 @@ int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
 	mutex_unlock(&twl->xfer_lock);
 
-	/* i2cTransfer returns num messages.translate it pls.. */
-	if (ret >= 0)
-		ret = 0;
-	return ret;
+	/* i2c_transfer returns number of messages transferred */
+	if (ret != 1) {
+		pr_err("%s: twl4030_i2c_write failed to transfer all messages\n", DRIVER_NAME);
+		return ret;
+	} else
+		return 0;
 }
 EXPORT_SYMBOL(twl4030_i2c_write);
 
@@ -350,10 +352,13 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
 	mutex_unlock(&twl->xfer_lock);
 
-	/* i2cTransfer returns num messages.translate it pls.. */
-	if (ret >= 0)
-		ret = 0;
-	return ret;
+	/* i2c_transfer returns number of messages transferred */
+	if (ret != 2) {
+		pr_err("%s: twl4030_i2c_read failed to transfer all messages\n", DRIVER_NAME);
+		return ret;
+	}
+	else
+		return 0;
 }
 EXPORT_SYMBOL(twl4030_i2c_read);
 
-- 
1.6.3.3

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