linux-kernel - [PATCH] staging: emxx_udc: Remove unused device

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Message-Id: <20181004055559.3197-1-natechancellor@gmail.com>
Date:   Wed,  3 Oct 2018 22:56:00 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] staging: emxx_udc: Remove unused device_desc declaration

Clang warns:

drivers/staging/emxx_udc/emxx_udc.c:1373:37: warning: variable
'device_desc' is not needed and will not be emitted
[-Wunneeded-internal-declaration]
static struct usb_device_descriptor device_desc = {
                                    ^
1 warning generated.

This definition hasn't been attached to anything since the driver was
introduced in commit 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile
USB Gadget driver") and neither GCC nor Clang emit any reference to the
variable in the final assembly. The only reason GCC doesn't warn about
this variable being unused is the sizeof function.

Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

This seems kind of wrong given this is a USB driver but there isn't an
instance of a platform_driver in the kernel tree having a usb device
descriptor declaration so I'm unsure of how to handle this warning aside
from just removing the definition but I'm certainly open to suggestions.

 drivers/staging/emxx_udc/emxx_udc.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index 0e8d3f232fe9..65cc3d9af972 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -1368,25 +1368,6 @@ static void _nbu2ss_set_endpoint_stall(
 	}
 }
 
-/*-------------------------------------------------------------------------*/
-/* Device Descriptor */
-static struct usb_device_descriptor device_desc = {
-	.bLength              = sizeof(device_desc),
-	.bDescriptorType      = USB_DT_DEVICE,
-	.bcdUSB               = cpu_to_le16(0x0200),
-	.bDeviceClass         = USB_CLASS_VENDOR_SPEC,
-	.bDeviceSubClass      = 0x00,
-	.bDeviceProtocol      = 0x00,
-	.bMaxPacketSize0      = 64,
-	.idVendor             = cpu_to_le16(0x0409),
-	.idProduct            = cpu_to_le16(0xfff0),
-	.bcdDevice            = 0xffff,
-	.iManufacturer        = 0x00,
-	.iProduct             = 0x00,
-	.iSerialNumber        = 0x00,
-	.bNumConfigurations   = 0x01,
-};
-
 /*-------------------------------------------------------------------------*/
 static void _nbu2ss_set_test_mode(struct nbu2ss_udc *udc, u32 mode)
 {
-- 
2.19.0