From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04516BA32 for ; Tue, 7 Mar 2023 17:16:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F0CFC4339B; Tue, 7 Mar 2023 17:16:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678209392; bh=fUUY0unCF5oY542uBwo1tkWlQ0VzFf7VXy8HLmQ6c2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m/wpmo1TwIOETS7lqSOdZuOnDQxzEc8c0ZpaAv1aOELYKSn76UJBeenQkjMY4+YL7 6/9PXzuX5n5Wv3uOafgIbEGkqz6hT/Yic+NL6tZmU23ORcvK1MroN1GXBBYV7AZys2 HD0f65mBev2UtMxr0iAKF+sVLo/lnFQOHyt9DYd8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ping-Ke Shih , Sascha Hauer , Martin Blumenstingl , Kalle Valo , Sasha Levin Subject: [PATCH 6.2 0205/1001] wifi: rtw88: Use non-atomic sta iterator in rtw_ra_mask_info_update() Date: Tue, 7 Mar 2023 17:49:37 +0100 Message-Id: <20230307170030.796916057@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Martin Blumenstingl [ Upstream commit 2931978cd74f4a643deeea5b211523001d95aa44 ] USB and (upcoming) SDIO support may sleep in the read/write handlers. Use non-atomic rtw_iterate_stas() in rtw_ra_mask_info_update() because the iterator function rtw_ra_mask_info_update_iter() needs to read and write registers from within rtw_update_sta_info(). Using the non-atomic iterator ensures that we can sleep during USB and SDIO register reads and writes. This fixes "scheduling while atomic" or "Voluntary context switch within RCU read-side critical section!" warnings as seen by SDIO card users (but it also affects USB cards). Fixes: 78d5bf925f30 ("wifi: rtw88: iterate over vif/sta list non-atomically") Suggested-by: Ping-Ke Shih Reviewed-by: Ping-Ke Shih Tested-by: Sascha Hauer Signed-off-by: Martin Blumenstingl Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20230108211324.442823-4-martin.blumenstingl@googlemail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtw88/mac80211.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c index 776a9a9884b5d..3b92ac611d3fd 100644 --- a/drivers/net/wireless/realtek/rtw88/mac80211.c +++ b/drivers/net/wireless/realtek/rtw88/mac80211.c @@ -737,7 +737,7 @@ static void rtw_ra_mask_info_update(struct rtw_dev *rtwdev, br_data.rtwdev = rtwdev; br_data.vif = vif; br_data.mask = mask; - rtw_iterate_stas_atomic(rtwdev, rtw_ra_mask_info_update_iter, &br_data); + rtw_iterate_stas(rtwdev, rtw_ra_mask_info_update_iter, &br_data); } static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw, @@ -746,7 +746,9 @@ static int rtw_ops_set_bitrate_mask(struct ieee80211_hw *hw, { struct rtw_dev *rtwdev = hw->priv; + mutex_lock(&rtwdev->mutex); rtw_ra_mask_info_update(rtwdev, vif, mask); + mutex_unlock(&rtwdev->mutex); return 0; } -- 2.39.2