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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/