linux-kernel - [ 105/149] hwmon: (fam15h_power) Correct sign extension of running_avg

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Message-Id: <20120330194856.865704732@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:50:18 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Andre Przywara <andre.przywara@....com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [ 105/149] hwmon: (fam15h_power) Correct sign extension of running_avg_capture

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Andreas Herrmann <andreas.herrmann3@....com>

commit fc0900cbda9243957d812cd6b4cc87965f9fe75f upstream.

Wrong bit was used for sign extension which caused wrong end results.
Thanks to Andre for spotting this bug.

Reported-by: Andre Przywara <andre.przywara@....com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
Acked-by: Guenter Roeck <guenter.roeck@...csson.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/fam15h_power.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/fam15h_power.c
+++ b/drivers/hwmon/fam15h_power.c
@@ -60,7 +60,7 @@ static ssize_t show_power(struct device
 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
 				  REG_TDP_RUNNING_AVERAGE, &val);
 	running_avg_capture = (val >> 4) & 0x3fffff;
-	running_avg_capture = sign_extend32(running_avg_capture, 22);
+	running_avg_capture = sign_extend32(running_avg_capture, 21);
 	running_avg_range = val & 0xf;
 
 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),


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