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>,
Pkshih <pkshih@realtek.com>, Ed Swierk <eswierk@gh.st>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v3 6/8] rtw88: Configure the registers from rtw_bf_assoc() outside the RCU lock
Date: Sat, 8 Jan 2022 01:55:31 +0100 [thread overview]
Message-ID: <20220108005533.947787-7-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20220108005533.947787-1-martin.blumenstingl@googlemail.com>
Upcoming SDIO support may sleep in the read/write handlers. Shrink the
RCU critical section so it only cover the ieee80211_find_sta() call and
finding the ic_vht_cap/vht_cap based on the found station. This moves
the chip's BFEE configuration outside the rcu_read_lock section and thus
prevent a "scheduling while atomic" issue when accessing the registers
using an SDIO card.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
v2 -> v3:
- no changes
v1 -> v2:
- shrink the critical section as suggested by Ping-Ke
drivers/net/wireless/realtek/rtw88/bf.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw88/bf.c b/drivers/net/wireless/realtek/rtw88/bf.c
index df750b3a35e9..792eb9930269 100644
--- a/drivers/net/wireless/realtek/rtw88/bf.c
+++ b/drivers/net/wireless/realtek/rtw88/bf.c
@@ -49,19 +49,23 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
sta = ieee80211_find_sta(vif, bssid);
if (!sta) {
+ rcu_read_unlock();
+
rtw_warn(rtwdev, "failed to find station entry for bss %pM\n",
bssid);
- goto out_unlock;
+ return;
}
ic_vht_cap = &hw->wiphy->bands[NL80211_BAND_5GHZ]->vht_cap;
vht_cap = &sta->vht_cap;
+ rcu_read_unlock();
+
if ((ic_vht_cap->cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) &&
(vht_cap->cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)) {
if (bfinfo->bfer_mu_cnt >= chip->bfer_mu_max_num) {
rtw_dbg(rtwdev, RTW_DBG_BF, "mu bfer number over limit\n");
- goto out_unlock;
+ return;
}
ether_addr_copy(bfee->mac_addr, bssid);
@@ -75,7 +79,7 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
(vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)) {
if (bfinfo->bfer_su_cnt >= chip->bfer_su_max_num) {
rtw_dbg(rtwdev, RTW_DBG_BF, "su bfer number over limit\n");
- goto out_unlock;
+ return;
}
sound_dim = vht_cap->cap &
@@ -98,9 +102,6 @@ void rtw_bf_assoc(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
rtw_chip_config_bfee(rtwdev, rtwvif, bfee, true);
}
-
-out_unlock:
- rcu_read_unlock();
}
void rtw_bf_init_bfer_entry_mu(struct rtw_dev *rtwdev,
--
2.34.1
next prev parent reply other threads:[~2022-01-08 0:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-08 0:55 [PATCH v3 0/8] rtw88: prepare locking for SDIO support Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 1/8] rtw88: Move rtw_chip_cfg_csi_rate() out of rtw_vif_watch_dog_iter() Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 2/8] rtw88: Move rtw_update_sta_info() out of rtw_ra_mask_info_update_iter() Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 3/8] rtw88: Use rtw_iterate_vifs where the iterator reads or writes registers Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 4/8] rtw88: Use rtw_iterate_stas " Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 5/8] rtw88: Replace usage of rtw_iterate_keys_rcu() with rtw_iterate_keys() Martin Blumenstingl
2022-01-08 0:55 ` Martin Blumenstingl [this message]
2022-01-08 0:55 ` [PATCH v3 7/8] rtw88: hci: Convert rf_lock from a spinlock to a mutex Martin Blumenstingl
2022-01-08 0:55 ` [PATCH v3 8/8] rtw88: fw: Convert h2c.lock " Martin Blumenstingl
2022-01-19 9:38 ` [PATCH v3 0/8] rtw88: prepare locking for SDIO support Pkshih
2022-01-21 8:10 ` Pkshih
2022-01-23 19:03 ` Martin Blumenstingl
2022-01-24 2:59 ` Pkshih
2022-01-27 21:52 ` Martin Blumenstingl
2022-01-28 0:51 ` Pkshih
2022-01-30 21:40 ` Martin Blumenstingl
2022-01-31 3:06 ` Pkshih
2022-02-03 22:26 ` Johannes Berg
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