linux-kernel - [11/70] hwmon: (pmbus) Drop check for PMBus revision register in probe function

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Date:	Mon, 01 Aug 2011 16:18:26 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Guenter Roeck <guenter.roeck@...csson.com>
Subject: [11/70] hwmon: (pmbus) Drop check for PMBus revision register in probe function

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Guenter Roeck <guenter.roeck@...csson.com>

commit 7f2c0662e5cfd05f12ca49109e8f787bf2d87b66 upstream.

Some PMBus devices do not support the PMBus revision register, so don't check
if it exists.

Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
Reviewed-by: Robert Coulson <robert.coulson@...csson.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/pmbus_core.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

--- a/drivers/hwmon/pmbus_core.c
+++ b/drivers/hwmon/pmbus_core.c
@@ -1518,14 +1518,9 @@ int pmbus_do_probe(struct i2c_client *cl
 	i2c_set_clientdata(client, data);
 	mutex_init(&data->update_lock);
 
-	/*
-	 * Bail out if status register or PMBus revision register
-	 * does not exist.
-	 */
-	if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
-	    || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
-		dev_err(&client->dev,
-			"Status or revision register not found\n");
+	/* Bail out if PMBus status register does not exist. */
+	if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
+		dev_err(&client->dev, "PMBus status register not found\n");
 		ret = -ENODEV;
 		goto out_data;
 	}


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