linux-kernel - [PATCH][next] usb: gadget: uvc: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <Z9dyY7_ydJiGqh_d@kspp>
Date: Mon, 17 Mar 2025 11:22:51 +1030
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] usb: gadget: uvc: Avoid -Wflex-array-member-not-at-end
 warnings

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the structure. Notice
that `struct uvc_input_header_descriptor` is a flexible structure --a
structure that contains a flexible-array member.

With this, fix three of the following warnings:

drivers/usb/gadget/function/uvc_configfs.h:77:57: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/usb/gadget/function/uvc_configfs.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/uvc_configfs.h b/drivers/usb/gadget/function/uvc_configfs.h
index 2f78cd4f396f..9391614135e9 100644
--- a/drivers/usb/gadget/function/uvc_configfs.h
+++ b/drivers/usb/gadget/function/uvc_configfs.h
@@ -74,10 +74,12 @@ static inline struct uvcg_format *to_uvcg_format(struct config_item *item)
 
 struct uvcg_streaming_header {
 	struct config_item				item;
-	struct uvc_input_header_descriptor		desc;
 	unsigned					linked;
 	struct list_head				formats;
 	unsigned					num_fmt;
+
+	/* Must be last --ends in a flexible-array member. */
+	struct uvc_input_header_descriptor		desc;
 };
 
 static inline struct uvcg_streaming_header *to_uvcg_streaming_header(struct config_item *item)
-- 
2.43.0