From patchwork Wed Jul 18 16:10:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory CLEMENT X-Patchwork-Id: 10532813 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CB861601D2 for ; Wed, 18 Jul 2018 16:12:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BACB1290A4 for ; Wed, 18 Jul 2018 16:12:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AED23290B9; Wed, 18 Jul 2018 16:12:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4DEDE290A4 for ; Wed, 18 Jul 2018 16:12:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=OJynbC4eAOqboS77YpaENddONId3tQPbNpPTX9Xe520=; b=TSPVVIHHKRwjxZISFW+LY9zEGQ OSQH6sO3CVcwZBxblA5MSpHGhaDi7U/HZvUpDWy5VDemPV0HmWlecnrjfRzZNi9NLlzqM8zY7I7Fw KcX5jY1xJkrNQWMW1Z8+ZJ8122CvuG2tVeAgEdJgw/5euKgx5Fe+tCTpTc20sS1zhvoSeJbaQu1Br Bd8P2Gz6OQKc6H2pF5rrroUmh3fSYLzyErBIt59ynmuhFkghkTCWGv+7ia4M7BKwrR+5ueUCjTo17 oSG29wiDq5X/utrqxs/o8LjEESPRc3PUJqGqg+gUbqYEjHdAB7soDCp7yH+GUK+4TPQX6lFTKhaL6 wQuCVHZQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1ffp43-0004pc-9D; Wed, 18 Jul 2018 16:12:31 +0000 Received: from mail.bootlin.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1ffp2s-00039A-6H for linux-arm-kernel@lists.infradead.org; Wed, 18 Jul 2018 16:11:21 +0000 Received: by mail.bootlin.com (Postfix, from userid 110) id D897720908; Wed, 18 Jul 2018 18:11:09 +0200 (CEST) Received: from localhost (242.171.71.37.rev.sfr.net [37.71.171.242]) by mail.bootlin.com (Postfix) with ESMTPSA id AA2E820741; Wed, 18 Jul 2018 18:11:09 +0200 (CEST) From: Gregory CLEMENT To: "David S. Miller" , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next v3 3/8] net: mvneta: remove data pointer usage from device_node structure Date: Wed, 18 Jul 2018 18:10:52 +0200 Message-Id: <20180718161057.28704-4-gregory.clement@bootlin.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180718161057.28704-1-gregory.clement@bootlin.com> References: <20180718161057.28704-1-gregory.clement@bootlin.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180718_091118_734141_BE3A4CE9 X-CRM114-Status: GOOD ( 16.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Lunn , Jason Cooper , Antoine Tenart , Gregory CLEMENT , Maxime Chevallier , Nadav Haklai , Yelena Krivosheev , Thomas Petazzoni , =?UTF-8?q?Miqu=C3=A8l=20Raynal?= , Marcin Wojtas , Dmitri Epshtein , linux-arm-kernel@lists.infradead.org, Sebastian Hesselbarth MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP On year ago Rob Herring wanted to remove the data pointer from the device_node structure[1]. The mvneta driver seemed to be the only one which used (abused ?) it. However, the proposal of Rob to remove this pointer from the driver introduced a regression, and I tested and fixed an alternative way, but it was never submitted as a proper patch. Now here it is: Instead of using the device_node structure ->data pointer, we store the BM private data as the driver data of the BM platform_device. The core mvneta code can retrieve it by doing a lookup on which platform_device corresponds to the BM device tree node using of_find_device_by_node(), and get its driver data [1]https://www.spinics.net/lists/netdev/msg445197.html Signed-off-by: Gregory CLEMENT --- drivers/net/ethernet/marvell/mvneta.c | 18 ++++++++++++------ drivers/net/ethernet/marvell/mvneta_bm.c | 15 +++++++++++++++ drivers/net/ethernet/marvell/mvneta_bm.h | 5 +++++ 3 files changed, 32 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 3d1f4335b0d3..011794148ec8 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -4461,12 +4461,16 @@ static int mvneta_probe(struct platform_device *pdev) /* Obtain access to BM resources if enabled and already initialized */ bm_node = of_parse_phandle(dn, "buffer-manager", 0); - if (bm_node && bm_node->data) { - pp->bm_priv = bm_node->data; - err = mvneta_bm_port_init(pdev, pp); - if (err < 0) { - dev_info(&pdev->dev, "use SW buffer management\n"); - pp->bm_priv = NULL; + if (bm_node) { + pp->bm_priv = mvneta_bm_get(bm_node); + if (pp->bm_priv) { + err = mvneta_bm_port_init(pdev, pp); + if (err < 0) { + dev_info(&pdev->dev, + "use SW buffer management\n"); + mvneta_bm_put(pp->bm_priv); + pp->bm_priv = NULL; + } } } of_node_put(bm_node); @@ -4527,6 +4531,7 @@ static int mvneta_probe(struct platform_device *pdev) mvneta_bm_pool_destroy(pp->bm_priv, pp->pool_long, 1 << pp->id); mvneta_bm_pool_destroy(pp->bm_priv, pp->pool_short, 1 << pp->id); + mvneta_bm_put(pp->bm_priv); } err_free_stats: free_percpu(pp->stats); @@ -4564,6 +4569,7 @@ static int mvneta_remove(struct platform_device *pdev) mvneta_bm_pool_destroy(pp->bm_priv, pp->pool_long, 1 << pp->id); mvneta_bm_pool_destroy(pp->bm_priv, pp->pool_short, 1 << pp->id); + mvneta_bm_put(pp->bm_priv); } return 0; diff --git a/drivers/net/ethernet/marvell/mvneta_bm.c b/drivers/net/ethernet/marvell/mvneta_bm.c index 466939f8f0cf..de468e1bdba9 100644 --- a/drivers/net/ethernet/marvell/mvneta_bm.c +++ b/drivers/net/ethernet/marvell/mvneta_bm.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -392,6 +393,20 @@ static void mvneta_bm_put_sram(struct mvneta_bm *priv) MVNETA_BM_BPPI_SIZE); } +struct mvneta_bm *mvneta_bm_get(struct device_node *node) +{ + struct platform_device *pdev = of_find_device_by_node(node); + + return pdev ? platform_get_drvdata(pdev) : NULL; +} +EXPORT_SYMBOL_GPL(mvneta_bm_get); + +void mvneta_bm_put(struct mvneta_bm *priv) +{ + platform_device_put(priv->pdev); +} +EXPORT_SYMBOL_GPL(mvneta_bm_put); + static int mvneta_bm_probe(struct platform_device *pdev) { struct device_node *dn = pdev->dev.of_node; diff --git a/drivers/net/ethernet/marvell/mvneta_bm.h b/drivers/net/ethernet/marvell/mvneta_bm.h index a32de432800c..9358626e51ec 100644 --- a/drivers/net/ethernet/marvell/mvneta_bm.h +++ b/drivers/net/ethernet/marvell/mvneta_bm.h @@ -134,6 +134,9 @@ void *mvneta_frag_alloc(unsigned int frag_size); void mvneta_frag_free(unsigned int frag_size, void *data); #if IS_ENABLED(CONFIG_MVNETA_BM) +struct mvneta_bm *mvneta_bm_get(struct device_node *node); +void mvneta_bm_put(struct mvneta_bm *priv); + void mvneta_bm_pool_destroy(struct mvneta_bm *priv, struct mvneta_bm_pool *bm_pool, u8 port_map); void mvneta_bm_bufs_free(struct mvneta_bm *priv, struct mvneta_bm_pool *bm_pool, @@ -178,5 +181,7 @@ static inline void mvneta_bm_pool_put_bp(struct mvneta_bm *priv, static inline u32 mvneta_bm_pool_get_bp(struct mvneta_bm *priv, struct mvneta_bm_pool *bm_pool) { return 0; } +struct mvneta_bm *mvneta_bm_get(struct device_node *node) { return NULL; } +void mvneta_bm_put(struct mvneta_bm *priv) {} #endif /* CONFIG_MVNETA_BM */ #endif