linux-kernel - [PATCH RFC v1 4/7] rtw88: Replace usage of rtw_iterate_keys_rcu() with rtw_iterate

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Message-Id: <20210717204057.67495-5-martin.blumenstingl@googlemail.com>
Date:   Sat, 17 Jul 2021 22:40:54 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-wireless@...r.kernel.org
Cc:     tony0620emma@...il.com, kvalo@...eaurora.org,
        johannes@...solutions.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Neo Jou <neojou@...il.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH RFC v1 4/7] rtw88: Replace usage of rtw_iterate_keys_rcu() with rtw_iterate_keys()

Upcoming SDIO support may sleep in the read/write handlers. The only
occurrence of rtw_iterate_keys_rcu() reads and writes registers from
it's iterator function. Replace it with rtw_iterate_keys() (the non-RCU
version). This will prevent an "scheduling while atomic" issue when
using an SDIO device.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/net/wireless/realtek/rtw88/main.c | 4 +---
 drivers/net/wireless/realtek/rtw88/util.h | 2 --
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 6e0d25f0afe3..e40432b1dcee 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -574,9 +574,7 @@ static void __fw_recovery_work(struct rtw_dev *rtwdev)
 
 	WARN(1, "firmware crash, start reset and recover\n");
 
-	rcu_read_lock();
-	rtw_iterate_keys_rcu(rtwdev, NULL, rtw_reset_key_iter, rtwdev);
-	rcu_read_unlock();
+	rtw_iterate_keys(rtwdev, NULL, rtw_reset_key_iter, rtwdev);
 	rtw_iterate_stas(rtwdev, rtw_reset_sta_iter, rtwdev);
 	rtw_iterate_vifs(rtwdev, rtw_reset_vif_iter, rtwdev);
 	rtw_enter_ips(rtwdev);
diff --git a/drivers/net/wireless/realtek/rtw88/util.h b/drivers/net/wireless/realtek/rtw88/util.h
index b0dfadf8b82a..06a5b4c4111c 100644
--- a/drivers/net/wireless/realtek/rtw88/util.h
+++ b/drivers/net/wireless/realtek/rtw88/util.h
@@ -19,8 +19,6 @@ struct rtw_dev;
 	ieee80211_iterate_stations_atomic(rtwdev->hw, iterator, data)
 #define rtw_iterate_keys(rtwdev, vif, iterator, data)			       \
 	ieee80211_iter_keys(rtwdev->hw, vif, iterator, data)
-#define rtw_iterate_keys_rcu(rtwdev, vif, iterator, data)		       \
-	ieee80211_iter_keys_rcu((rtwdev)->hw, vif, iterator, data)
 
 static inline u8 *get_hdr_bssid(struct ieee80211_hdr *hdr)
 {
-- 
2.32.0