linux-kernel - [PATCH] staging: vt665x: fix alignment constraints

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Message-Id: <20210204162731.3132069-1-arnd@kernel.org>
Date:   Thu,  4 Feb 2021 17:27:17 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Malcolm Priestley <tvboxspy@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Payal Kshirsagar <payalskshirsagar1234@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: vt665x: fix alignment constraints

From: Arnd Bergmann <arnd@...db.de>

multiple structures contains a ieee80211_rts structure, which is required to
have at least two byte alignment, but are annotated with a __packed attribute
to force single-byte alignment:

staging/vt6656/rxtx.h:98:1: warning: alignment 1 of 'struct vnt_rts_g' is less than 2 [-Wpacked-not-aligned]
staging/vt6656/rxtx.h:106:1: warning: alignment 1 of 'struct vnt_rts_ab' is less than 2 [-Wpacked-not-aligned]
staging/vt6656/rxtx.h:116:1: warning: alignment 1 of 'struct vnt_cts' is less than 2 [-Wpacked-not-aligned]

I see no reason why the structure itself would be misaligned, and all members
have at least two-byte alignment within the structure, so use the same
constraint on the sturcture itself.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/staging/vt6655/rxtx.h | 8 ++++----
 drivers/staging/vt6656/rxtx.h | 6 +++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/vt6655/rxtx.h b/drivers/staging/vt6655/rxtx.h
index 464dd89078b2..e7061d383306 100644
--- a/drivers/staging/vt6655/rxtx.h
+++ b/drivers/staging/vt6655/rxtx.h
@@ -111,7 +111,7 @@ struct vnt_rts_g {
 	__le16 duration_bb;
 	u16 reserved;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_g_fb {
 	struct vnt_phy_field b;
@@ -125,14 +125,14 @@ struct vnt_rts_g_fb {
 	__le16 rts_duration_ba_f1;
 	__le16 rts_duration_aa_f1;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_ab {
 	struct vnt_phy_field ab;
 	__le16 duration;
 	u16 reserved;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_a_fb {
 	struct vnt_phy_field a;
@@ -141,7 +141,7 @@ struct vnt_rts_a_fb {
 	__le16 rts_duration_f0;
 	__le16 rts_duration_f1;
 	struct ieee80211_rts data;
-} __packed;
+} __packed __aligned(2);
 
 /* CTS buffer header */
 struct vnt_cts {
diff --git a/drivers/staging/vt6656/rxtx.h b/drivers/staging/vt6656/rxtx.h
index 6ca2ca32d036..f23440799443 100644
--- a/drivers/staging/vt6656/rxtx.h
+++ b/drivers/staging/vt6656/rxtx.h
@@ -95,7 +95,7 @@ struct vnt_rts_g {
 	u16 wReserved;
 	struct ieee80211_rts data;
 	struct vnt_tx_datahead_g data_head;
-} __packed;
+} __packed __aligned(2);
 
 struct vnt_rts_ab {
 	struct vnt_phy_field ab;
@@ -103,7 +103,7 @@ struct vnt_rts_ab {
 	u16 wReserved;
 	struct ieee80211_rts data;
 	struct vnt_tx_datahead_ab data_head;
-} __packed;
+} __packed __aligned(2);
 
 /* CTS buffer header */
 struct vnt_cts {
@@ -113,7 +113,7 @@ struct vnt_cts {
 	struct ieee80211_cts data;
 	u16 reserved2;
 	struct vnt_tx_datahead_g data_head;
-} __packed;
+} __packed __aligned(2);
 
 union vnt_tx_data_head {
 	/* rts g */
-- 
2.29.2