linux-kernel - [PATCH 12/12] hwmon: (nct6775) Only report VID if supported and enabled

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

Message-Id: <1361903020-18526-13-git-send-email-linux@roeck-us.net>
Date:	Tue, 26 Feb 2013 10:23:40 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 12/12] hwmon: (nct6775) Only report VID if supported and enabled

VID is not always enabled (NCT6775, NCT6776) or supported (NCT6779).

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/hwmon/nct6775.c |   30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index a4b076a..aeeb0a1 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -3398,6 +3398,8 @@ static int nct6775_probe(struct platform_device *pdev)
 	const u16 *reg_temp, *reg_temp_over, *reg_temp_hyst, *reg_temp_config;
 	const u16 *reg_temp_alternate, *reg_temp_crit;
 	int num_reg_temp;
+	bool have_vid = false;
+	u8 cr2a;
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	if (!devm_request_region(&pdev->dev, res->start, IOREGION_LENGTH,
@@ -3766,17 +3768,31 @@ static int nct6775_probe(struct platform_device *pdev)
 	/* Initialize the chip */
 	nct6775_init_device(data);
 
-	data->vrm = vid_which_vrm();
 	err = superio_enter(sio_data->sioreg);
 	if (err)
 		return err;
 
+	cr2a = superio_inb(sio_data->sioreg, 0x2a);
+	switch (data->kind) {
+	case nct6775:
+		have_vid = (cr2a & 0x40);
+		break;
+	case nct6776:
+		have_vid = (cr2a & 0x60) == 0x40;
+		break;
+	case nct6779:
+		break;
+	}
+
 	/*
 	 * Read VID value
 	 * We can get the VID input values directly at logical device D 0xe3.
 	 */
-	superio_select(sio_data->sioreg, NCT6775_LD_VID);
-	data->vid = superio_inb(sio_data->sioreg, 0xe3);
+	if (have_vid) {
+		superio_select(sio_data->sioreg, NCT6775_LD_VID);
+		data->vid = superio_inb(sio_data->sioreg, 0xe3);
+		data->vrm = vid_which_vrm();
+	}
 
 	if (fan_debounce) {
 		u8 tmp;
@@ -3801,9 +3817,11 @@ static int nct6775_probe(struct platform_device *pdev)
 
 	superio_exit(sio_data->sioreg);
 
-	err = device_create_file(dev, &dev_attr_cpu0_vid);
-	if (err)
-		return err;
+	if (have_vid) {
+		err = device_create_file(dev, &dev_attr_cpu0_vid);
+		if (err)
+			return err;
+	}
 
 	err = nct6775_check_fan_inputs(sio_data, data);
 	if (err)
-- 
1.7.9.7

--
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/