linux-kernel - [PATCH 4/4] USB: EHCI: Rearrange create_companion

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Date:	Tue, 25 Jan 2011 09:59:37 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	linux-usb@...r.kernel.org, gregkh@...e.de,
	dbrownell@...rs.sourceforge.net
Cc:	linux-kernel@...r.kernel.org,
	David Daney <ddaney@...iumnetworks.com>
Subject: [PATCH 4/4] USB: EHCI: Rearrange create_companion_file() to avoid GCC-4.6 warnings.

In create_companion_file() there is a bogus assignemt to i created for
the express purpose of avoiding an ignored return value warning.

With pre-release GCC-4.6, this causes a 'set but not used' warning.

Kick the problem further down the road by just returning i.  All the
callers of create_companion_file() ignore its return value, so all is
good:

o No warnings are issued.

o We still subvert the desires of the authors of device_create_file()
  by ignorning error conditions.

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
---
 drivers/usb/host/ehci-hub.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 796ea0c..5aa6c49 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -531,14 +531,15 @@ static ssize_t store_companion(struct device *dev,
 }
 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
 
-static inline void create_companion_file(struct ehci_hcd *ehci)
+static inline int create_companion_file(struct ehci_hcd *ehci)
 {
-	int	i;
+	int	i = 0;
 
 	/* with integrated TT there is no companion! */
 	if (!ehci_is_TDI(ehci))
 		i = device_create_file(ehci_to_hcd(ehci)->self.controller,
 				       &dev_attr_companion);
+	return i;
 }
 
 static inline void remove_companion_file(struct ehci_hcd *ehci)
-- 
1.7.2.3

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