linux-kernel - [08/45] hwmon: (lm78) Fix I/O resource conflict with PNP

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Date:	Tue, 30 Mar 2010 15:48:28 -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,
	Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [08/45] hwmon: (lm78) Fix I/O resource conflict with PNP

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

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

From: Jean Delvare <khali@...ux-fr.org>

This fix is the combination of the following two upstream patches:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=197027e6ef830d60e10f76efc8d12bf3b6c35db5
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=47c15532ddcd6818f51cb15f914d63864b3ee9ab

Only request I/O ports 0x295-0x296 instead of the full I/O address
range. This solves a conflict with PNP resources on a few motherboards.

Also request the I/O ports individually during device detection,
otherwise the PNP resource may cause the request (and thus the
detection) fail.

Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/lm78.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -655,7 +655,7 @@ static int __devinit lm78_isa_probe(stru
 
 	/* Reserve the ISA region */
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-	if (!request_region(res->start, LM78_EXTENT, "lm78")) {
+	if (!request_region(res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) {
 		err = -EBUSY;
 		goto exit;
 	}
@@ -699,7 +699,7 @@ static int __devinit lm78_isa_probe(stru
 	device_remove_file(&pdev->dev, &dev_attr_name);
 	kfree(data);
  exit_release_region:
-	release_region(res->start, LM78_EXTENT);
+	release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
  exit:
 	return err;
 }
@@ -711,7 +711,7 @@ static int __devexit lm78_isa_remove(str
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
 	device_remove_file(&pdev->dev, &dev_attr_name);
-	release_region(data->client.addr, LM78_EXTENT);
+	release_region(data->client.addr + LM78_ADDR_REG_OFFSET, 2);
 	kfree(data);
 
 	return 0;
@@ -836,9 +836,17 @@ static struct lm78_data *lm78_update_dev
 static int __init lm78_isa_found(unsigned short address)
 {
 	int val, save, found = 0;
+	int port;
 
-	if (!request_region(address, LM78_EXTENT, "lm78"))
-		return 0;
+	/* Some boards declare base+0 to base+7 as a PNP device, some base+4
+	 * to base+7 and some base+5 to base+6. So we better request each port
+	 * individually for the probing phase. */
+	for (port = address; port < address + LM78_EXTENT; port++) {
+		if (!request_region(port, 1, "lm78")) {
+			pr_debug("lm78: Failed to request port 0x%x\n", port);
+			goto release;
+		}
+	}
 
 #define REALLY_SLOW_IO
 	/* We need the timeouts for at least some LM78-like
@@ -901,7 +909,8 @@ static int __init lm78_isa_found(unsigne
 			val & 0x80 ? "LM79" : "LM78", (int)address);
 
  release:
-	release_region(address, LM78_EXTENT);
+	for (port--; port >= address; port--)
+		release_region(port, 1);
 	return found;
 }
 


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