From patchwork Tue Dec 28 21:14:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Blumenstingl X-Patchwork-Id: 528800 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C30AEC433EF for ; Tue, 28 Dec 2021 21:15:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237398AbhL1VPZ (ORCPT ); Tue, 28 Dec 2021 16:15:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236376AbhL1VPV (ORCPT ); Tue, 28 Dec 2021 16:15:21 -0500 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DF85C061574; Tue, 28 Dec 2021 13:15:21 -0800 (PST) Received: by mail-wm1-x333.google.com with SMTP id b186-20020a1c1bc3000000b00345734afe78so10744336wmb.0; Tue, 28 Dec 2021 13:15:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=SEMbs8uawFQ22g6pe5+yochD9fdd3KiYBmK2xcx9DT0=; b=OBJtompVYgj2tIy1ENvuYYRwZTT/I9of98emtNzcJE2Z0bc+u2dHTX7IwrD2Igxaq8 ZhQPLEE3gE+7RRzbncDF6LKeuJFs2ZslxzQw75HgFpOGpLBpeXNBkrmKbpU7MSVRFcoR I9cSjlgIh0s2FTMn8gahEGjbkM8a99wEUmkk16Ic2eAgpmB05aiC5SZl3H7XhnfYM4qQ Xy2XZtEAYp/ElqECmDdPhAvVb/HoQifpxG3qV2y7tTldRqoG5tiGhhAm1TmAPCr2RpBk Ztjfqq+2bnshnB4DmN4vgMvwvwqZruu46KGTytfuKXJwCbXc5ORUYCC4iSgAHq5do8yG g1jA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SEMbs8uawFQ22g6pe5+yochD9fdd3KiYBmK2xcx9DT0=; b=xuhA6G64MvtiCgZKv15O0yccjBf7DK1rzyKTrUskxsUqByj7vsUsACRi50M84W7wRS nNA7bJaC+m/AO+zEz5YWZeasmaTDorphbJkgzMr5WQ7VIokfgN0wAr7ZA2ASzEMIItix OADfXmp1Lrt1LP8LKwrHwJTAw71NUNRhMJfRo3XdIQUkssqm4+wnqBNuRCYJBTUpZICM UedRWVfHh6zzN06/fHgLYRTVgNYRGXTWs0fx0iLEu04FRH9bf72HLyBc5jsb1gf7mC/0 Em+n7NkkJ/tA9bX2v0aFW5mKiEx4VzdHHjH/a97HiwVTWPFwDSLbq7Irz+24BiHq481A WRWA== X-Gm-Message-State: AOAM532q1aM7/OU8MIwGGxa5B/8bXvwpXdB1SQLNwCw3ovDE9XokiINI vGISlGamaJMqnH2Bq2Vn0kRg6ECd9pk= X-Google-Smtp-Source: ABdhPJwtZrewBBGpSnxq9D2Flyk9gtz7au9JRe7U0I1v7bEqPXPOk9C14Uftz8XD8+zDe3Z1fip7Aw== X-Received: by 2002:a7b:c00d:: with SMTP id c13mr6913816wmb.99.1640726119608; Tue, 28 Dec 2021 13:15:19 -0800 (PST) Received: from localhost.localdomain (dynamic-2a01-0c23-c1d2-d400-f22f-74ff-fe21-0725.c23.pool.telefonica.de. [2a01:c23:c1d2:d400:f22f:74ff:fe21:725]) by smtp.googlemail.com with ESMTPSA id o11sm21939036wmq.15.2021.12.28.13.15.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Dec 2021 13:15:19 -0800 (PST) From: Martin Blumenstingl 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 , Jernej Skrabec , Pkshih , Martin Blumenstingl Subject: [PATCH 1/9] mac80211: Add stations iterator where the iterator function may sleep Date: Tue, 28 Dec 2021 22:14:53 +0100 Message-Id: <20211228211501.468981-2-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211228211501.468981-1-martin.blumenstingl@googlemail.com> References: <20211228211501.468981-1-martin.blumenstingl@googlemail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org ieee80211_iterate_active_interfaces() and ieee80211_iterate_active_interfaces_atomic() already exist, where the former allows the iterator function to sleep. Add ieee80211_iterate_stations() which is similar to ieee80211_iterate_stations_atomic() but allows the iterator to sleep. This is needed for adding SDIO support to the rtw88 driver. Some interators there are reading or writing registers. With the SDIO ops (sdio_readb, sdio_writeb and friends) this means that the iterator function may sleep. Signed-off-by: Martin Blumenstingl --- v1 -> v2: - fixed kernel doc copy & paste (remove _atomic) as suggested by Ping-Ke and Johannes - added paragraph about driver authors having to be careful where they use this new function as suggested by Johannes include/net/mac80211.h | 21 +++++++++++++++++++++ net/mac80211/util.c | 13 +++++++++++++ 2 files changed, 34 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 8907338d52b5..c50221d7e82c 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -5614,6 +5614,9 @@ void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw, * This function iterates over the interfaces associated with a given * hardware that are currently active and calls the callback for them. * This version can only be used while holding the wiphy mutex. + * The driver must not call this with a lock held that it can also take in + * response to callbacks from mac80211, and it must not call this within + * callbacks made by mac80211 - both would result in deadlocks. * * @hw: the hardware struct of which the interfaces should be iterated over * @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags @@ -5627,6 +5630,24 @@ void ieee80211_iterate_active_interfaces_mtx(struct ieee80211_hw *hw, struct ieee80211_vif *vif), void *data); +/** + * ieee80211_iterate_stations - iterate stations + * + * This function iterates over all stations associated with a given + * hardware that are currently uploaded to the driver and calls the callback + * function for them. + * This function allows the iterator function to sleep, when the iterator + * function is atomic @ieee80211_iterate_stations_atomic can be used. + * + * @hw: the hardware struct of which the interfaces should be iterated over + * @iterator: the iterator function to call, cannot sleep + * @data: first argument of the iterator function + */ +void ieee80211_iterate_stations(struct ieee80211_hw *hw, + void (*iterator)(void *data, + struct ieee80211_sta *sta), + void *data); + /** * ieee80211_iterate_stations_atomic - iterate stations * diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 0e4e1956bcea..f71b042a5c8b 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -862,6 +862,19 @@ static void __iterate_stations(struct ieee80211_local *local, } } +void ieee80211_iterate_stations(struct ieee80211_hw *hw, + void (*iterator)(void *data, + struct ieee80211_sta *sta), + void *data) +{ + struct ieee80211_local *local = hw_to_local(hw); + + mutex_lock(&local->sta_mtx); + __iterate_stations(local, iterator, data); + mutex_unlock(&local->sta_mtx); +} +EXPORT_SYMBOL_GPL(ieee80211_iterate_stations); + void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw, void (*iterator)(void *data, struct ieee80211_sta *sta),