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From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: linux-wireless@vger.kernel.org
Cc: tony0620emma@gmail.com, kvalo@codeaurora.org,
	johannes@sipsolutions.net, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, Neo Jou <neojou@gmail.com>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH RFC v1 4/7] rtw88: Replace usage of rtw_iterate_keys_rcu() with rtw_iterate_keys()
Date: Sat, 17 Jul 2021 22:40:54 +0200	[thread overview]
Message-ID: <20210717204057.67495-5-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20210717204057.67495-1-martin.blumenstingl@googlemail.com>

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@googlemail.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


  parent reply	other threads:[~2021-07-17 20:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-17 20:40 [PATCH RFC v1 0/7] rtw88: prepare locking for SDIO support Martin Blumenstingl
2021-07-17 20:40 ` [PATCH RFC v1 1/7] mac80211: Add stations iterator where the iterator function may sleep Martin Blumenstingl
2021-07-19  5:46   ` Pkshih
2021-07-19  6:30   ` Johannes Berg
2021-07-17 20:40 ` [PATCH RFC v1 2/7] rtw88: Use rtw_iterate_vifs where the iterator reads or writes registers Martin Blumenstingl
2021-07-19  5:47   ` Pkshih
2021-07-25 21:31     ` Martin Blumenstingl
2021-07-26  7:22       ` Pkshih
2021-07-17 20:40 ` [PATCH RFC v1 3/7] rtw88: Use rtw_iterate_stas " Martin Blumenstingl
2021-07-19  6:36   ` Johannes Berg
2021-07-25 21:51     ` Martin Blumenstingl
2021-07-26  7:22       ` Pkshih
2021-08-09 20:00         ` Johannes Berg
2021-07-17 20:40 ` Martin Blumenstingl [this message]
2021-07-17 20:40 ` [PATCH RFC v1 5/7] rtw88: Configure the registers from rtw_bf_assoc() outside the RCU lock Martin Blumenstingl
2021-07-19  5:47   ` Pkshih
2021-07-25 21:36     ` Martin Blumenstingl
2021-07-26  7:22       ` Pkshih
2021-07-17 20:40 ` [PATCH RFC v1 6/7] rtw88: hci: Convert rf_lock from a spinlock to a mutex Martin Blumenstingl
2021-07-17 20:40 ` [PATCH RFC v1 7/7] rtw88: fw: Convert h2c.lock " Martin Blumenstingl
2021-07-19  5:52 ` [PATCH RFC v1 0/7] rtw88: prepare locking for SDIO support Pkshih

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