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Subject[PATCH 3/9] rtw88: Move rtw_update_sta_info() out of rtw_ra_mask_info_update_iter()
Date
rtw_update_sta_info() internally access some registers while being
called unter an atomic lock acquired by rtw_iterate_vifs_atomic(). Move
rtw_update_sta_info() call out of (rtw_ra_mask_info_update_iter) in
preparation for SDIO support where register access may sleep.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
v1 -> v2:
- this patch is new in v2
- keep rtw_iterate_vifs_atomic() to prevent deadlocks as Johannes
suggested. Keep track of all relevant stations inside
rtw_ra_mask_info_update_iter() and the iter-data and then call
rtw_update_sta_info() while held under rtwdev->mutex instead

drivers/net/wireless/realtek/rtw88/mac80211.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c
index ae7d97de5fdf..3bd12354a8a1 100644
--- a/drivers/net/wireless/realtek/rtw88/mac80211.c
+++ b/drivers/net/wireless/realtek/rtw88/mac80211.c
@@ -671,6 +671,8 @@ struct rtw_iter_bitrate_mask_data {
struct rtw_dev *rtwdev;
struct ieee80211_vif *vif;
const struct cfg80211_bitrate_mask *mask;
+ unsigned int num_si;
+ struct rtw_sta_info *si[RTW_MAX_MAC_ID_NUM];
};

static void rtw_ra_mask_info_update_iter(void *data, struct ieee80211_sta *sta)
@@ -691,7 +693,8 @@ static void rtw_ra_mask_info_update_iter(void *data, struct ieee80211_sta *sta)
}

si->use_cfg_mask = true;
- rtw_update_sta_info(br_data->rtwdev, si);
+
+ br_data->si[br_data->num_si++] = si;
}

static void rtw_ra_mask_info_update(struct rtw_dev *rtwdev,
@@ -699,11 +702,20 @@ static void rtw_ra_mask_info_update(struct rtw_dev *rtwdev,
const struct cfg80211_bitrate_mask *mask)
{
struct rtw_iter_bitrate_mask_data br_data;
+ unsigned int i;
+
+ mutex_lock(&rtwdev->mutex);

br_data.rtwdev = rtwdev;
br_data.vif = vif;
br_data.mask = mask;
+ br_data.num_si = 0;
rtw_iterate_stas_atomic(rtwdev, rtw_ra_mask_info_update_iter, &br_data);
+
+ for (i = 0; i < br_data.num_si; i++)
+ rtw_update_sta_info(rtwdev, br_data.si[i]);
+
+ mutex_unlock(&rtwdev->mutex);
}

static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw,
--
2.34.1
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