From: Mathieu Malaterre <malat@debian.org>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Mathieu Malaterre <malat@debian.org>,
Johannes Berg <johannes.berg@intel.com>,
"David S. Miller" <davem@davemloft.net>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] mac80211: Remove attribute packed from struct 'action'
Date: Thu, 24 Jan 2019 19:05:35 +0100 [thread overview]
Message-ID: <20190124180535.20216-1-malat@debian.org> (raw)
During refactor in commit 9e478066eae4 ("mac80211: fix MU-MIMO
follow-MAC mode") a new struct 'action' was declared with packed
attribute as:
struct {
struct ieee80211_hdr_3addr hdr;
u8 category;
u8 action_code;
} __packed action;
But since struct 'ieee80211_hdr_3addr' is declared with an aligned
keyword as:
struct ieee80211_hdr {
__le16 frame_control;
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 addr2[ETH_ALEN];
u8 addr3[ETH_ALEN];
__le16 seq_ctrl;
u8 addr4[ETH_ALEN];
} __packed __aligned(2);
Solve the ambiguity of placing aligned structure in a packed one by
removing the packed attribute from struct. This seems to be the behavior
of gcc anyway, since the following is still compiling:
BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
This removes the following warning (W=1):
net/mac80211/rx.c:234:2: warning: alignment 1 of 'struct <anonymous>' is less than 2 [-Wpacked-not-aligned]
Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
---
net/mac80211/rx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 45aad3d3108c..709359650149 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -231,7 +231,7 @@ static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_hdr_3addr hdr;
u8 category;
u8 action_code;
- } __packed action;
+ } action;
if (!sdata)
return;
--
2.19.2
next reply other threads:[~2019-01-24 18:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-24 18:05 Mathieu Malaterre [this message]
2019-01-24 18:08 ` [PATCH] mac80211: Remove attribute packed from struct 'action' Johannes Berg
2019-01-24 18:14 ` Mathieu Malaterre
2019-01-24 18:19 ` Johannes Berg
2019-01-24 18:19 ` [PATCH v2] mac80211: Add attribute aligned(2) to " Mathieu Malaterre
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