linux-kernel - Re: [PATCH 3/5]acpi:glue.c Fix warning: variable 'ret' set but not used

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Date:	Thu, 01 Jul 2010 13:01:04 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	David Howells <dhowells@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	lenb@...nel.org
Subject: Re: [PATCH 3/5]acpi:glue.c Fix warning: variable 'ret' set but not
 used


> Not sure it's worth going that far.  You could reduce it still further:
>
> 		if (fn || pn)
> 			dev_warn(&acpi_dev->dev,
> 				 "Failed to create link(s) to %s %s:"
> 				 " %d\n",
> 				 dev_driver_string(dev), dev_name(dev),
> 				 fn ?: pn);
>
> Is it that important to know which failed to be created, or that both failed
> to be created?
>
> David
>


I like this..

fn ?: pn  (will this give us the results from the above question?
_both failed to be created_)
a bit confused with the whole:  "?:" though
*condition ? value if true : value if false* (what if both are true
what if both are false or does it matter?)

here is the patch itself with the change:



Fix a warning message generated by gcc:
Im getting a warning message when building with gcc 4.6.0
   CC      drivers/acpi/glue.o
drivers/acpi/glue.c: In function 'acpi_bind_one':
drivers/acpi/glue.c:163:7: warning: variable 'ret' set but not used

Signed-off-by: Justin P. Mattock <justinmattock@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>

---
  drivers/acpi/glue.c |   14 +++++++++++---
  1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 4af6301..23b16e6 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -145,6 +145,7 @@ static int acpi_bind_one(struct device *dev, 
acpi_handle handle)
  {
  	struct acpi_device *acpi_dev;
  	acpi_status status;
+	int fn, pn;

  	if (dev->archdata.acpi_handle) {
  		dev_warn(dev, "Drivers changed 'acpi_handle'\n");
@@ -160,12 +161,19 @@ static int acpi_bind_one(struct device *dev, 
acpi_handle handle)

  	status = acpi_bus_get_device(handle, &acpi_dev);
  	if (!ACPI_FAILURE(status)) {
-		int ret;

-		ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
+		fn = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
  				"firmware_node");
-		ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
+		pn = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
  				"physical_node");
+		if (fn || pn) {
+			dev_warn(&acpi_dev->dev,
+				"Failed to create link(s) to %s %s:"
+				" %d\n",
+				dev_driver_string(dev), dev_name(dev),
+				fn ?: pn);
+				return AE_ERROR;
+		}
  		if (acpi_dev->wakeup.flags.valid) {
  			device_set_wakeup_capable(dev, true);
  			device_set_wakeup_enable(dev,
-- 1.7.1.rc1.21.gf3bd6


Justin P. Mattock
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