From patchwork Thu Dec 1 15:26:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 13061445 X-Patchwork-Delegate: kuba@kernel.org 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 01EA2C4321E for ; Thu, 1 Dec 2022 15:27:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231637AbiLAP1V (ORCPT ); Thu, 1 Dec 2022 10:27:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229658AbiLAP1U (ORCPT ); Thu, 1 Dec 2022 10:27:20 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F4203A95A8 for ; Thu, 1 Dec 2022 07:27:18 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 961A861FA9 for ; Thu, 1 Dec 2022 15:27:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A137FC433D6; Thu, 1 Dec 2022 15:27:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669908438; bh=fjBkFSHXsfnsna0pkKiMUUzJlNUEorxvMDs0l/ALuZw=; h=From:To:Cc:Subject:Date:From; b=Ee/B22uKb/cFiI9/KlaoIh5LAQweauDguc70tsKFG5EvKotk7zh8iD52IT3TMNUr2 lh2bBc1LDXt/RpwA7u6zR/rh9vOx/+rwtq4EcyTo0u0MO4IlpCnHMkjA/PhCDOqZSp 8Q8uvATwL5SoPiS291hG2TZa8XyxWmPy2gg43zX0AvDTLPLPeVAzW3J1bBCCTJkaeo GFeE3ory3BeKO0ukalGhO8oJKFcNhVt9WomsL3EChCb8p15lHKlFPPCjbgtzPl/KVP Y4HI4b4IAw3D0ioLet6qTegm16Y3qoEwLNFrUOZPI+lpyyDQEoKGOLqGIC6pEwp+7a zO9Ui2hLPTu+w== From: Lorenzo Bianconi To: netdev@vger.kernel.org Cc: nbd@nbd.name, john@phrozen.org, sean.wang@mediatek.com, Mark-MC.Lee@mediatek.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org, lorenzo.bianconi@redhat.com Subject: [PATCH net-next] net: ethernet: mtk_wed: fix sleep while atomic in mtk_wed_wo_queue_refill Date: Thu, 1 Dec 2022 16:26:53 +0100 Message-Id: <67ca94bdd3d9eaeb86e52b3050fbca0bcf7bb02f.1669908312.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In order to fix the following sleep while atomic bug always alloc pages with GFP_ATOMIC in mtk_wed_wo_queue_refill since page_frag_alloc runs in spin_lock critical section. [ 9.049719] Hardware name: MediaTek MT7986a RFB (DT) [ 9.054665] Call trace: [ 9.057096] dump_backtrace+0x0/0x154 [ 9.060751] show_stack+0x14/0x1c [ 9.064052] dump_stack_lvl+0x64/0x7c [ 9.067702] dump_stack+0x14/0x2c [ 9.071001] ___might_sleep+0xec/0x120 [ 9.074736] __might_sleep+0x4c/0x9c [ 9.078296] __alloc_pages+0x184/0x2e4 [ 9.082030] page_frag_alloc_align+0x98/0x1ac [ 9.086369] mtk_wed_wo_queue_refill+0x134/0x234 [ 9.090974] mtk_wed_wo_init+0x174/0x2c0 [ 9.094881] mtk_wed_attach+0x7c8/0x7e0 [ 9.098701] mt7915_mmio_wed_init+0x1f0/0x3a0 [mt7915e] [ 9.103940] mt7915_pci_probe+0xec/0x3bc [mt7915e] [ 9.108727] pci_device_probe+0xac/0x13c [ 9.112638] really_probe.part.0+0x98/0x2f4 [ 9.116807] __driver_probe_device+0x94/0x13c [ 9.121147] driver_probe_device+0x40/0x114 [ 9.125314] __driver_attach+0x7c/0x180 [ 9.129133] bus_for_each_dev+0x5c/0x90 [ 9.132953] driver_attach+0x20/0x2c [ 9.136513] bus_add_driver+0x104/0x1fc [ 9.140333] driver_register+0x74/0x120 [ 9.144153] __pci_register_driver+0x40/0x50 [ 9.148407] mt7915_init+0x5c/0x1000 [mt7915e] [ 9.152848] do_one_initcall+0x40/0x25c [ 9.156669] do_init_module+0x44/0x230 [ 9.160403] load_module+0x1f30/0x2750 [ 9.164135] __do_sys_init_module+0x150/0x200 [ 9.168475] __arm64_sys_init_module+0x18/0x20 [ 9.172901] invoke_syscall.constprop.0+0x4c/0xe0 [ 9.177589] do_el0_svc+0x48/0xe0 [ 9.180889] el0_svc+0x14/0x50 [ 9.183929] el0t_64_sync_handler+0x9c/0x120 [ 9.188183] el0t_64_sync+0x158/0x15c Fixes: 799684448e3e ("net: ethernet: mtk_wed: introduce wed wo support") Signed-off-by: Lorenzo Bianconi Reviewed-by: Pavan Chebbi --- drivers/net/ethernet/mediatek/mtk_wed_wo.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_wed_wo.c b/drivers/net/ethernet/mediatek/mtk_wed_wo.c index 4754b6db009e..a219da85f4db 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed_wo.c +++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.c @@ -133,17 +133,18 @@ mtk_wed_wo_dequeue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, u32 *len, static int mtk_wed_wo_queue_refill(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q, - gfp_t gfp, bool rx) + bool rx) { enum dma_data_direction dir = rx ? DMA_FROM_DEVICE : DMA_TO_DEVICE; int n_buf = 0; spin_lock_bh(&q->lock); while (q->queued < q->n_desc) { - void *buf = page_frag_alloc(&q->cache, q->buf_size, gfp); struct mtk_wed_wo_queue_entry *entry; dma_addr_t addr; + void *buf; + buf = page_frag_alloc(&q->cache, q->buf_size, GFP_ATOMIC); if (!buf) break; @@ -215,7 +216,7 @@ mtk_wed_wo_rx_run_queue(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) mtk_wed_mcu_rx_unsolicited_event(wo, skb); } - if (mtk_wed_wo_queue_refill(wo, q, GFP_ATOMIC, true)) { + if (mtk_wed_wo_queue_refill(wo, q, true)) { u32 index = (q->head - 1) % q->n_desc; mtk_wed_wo_queue_kick(wo, q, index); @@ -432,7 +433,7 @@ mtk_wed_wo_hardware_init(struct mtk_wed_wo *wo) if (ret) goto error; - mtk_wed_wo_queue_refill(wo, &wo->q_tx, GFP_KERNEL, false); + mtk_wed_wo_queue_refill(wo, &wo->q_tx, false); mtk_wed_wo_queue_reset(wo, &wo->q_tx); regs.desc_base = MTK_WED_WO_CCIF_DUMMY5; @@ -446,7 +447,7 @@ mtk_wed_wo_hardware_init(struct mtk_wed_wo *wo) if (ret) goto error; - mtk_wed_wo_queue_refill(wo, &wo->q_rx, GFP_KERNEL, true); + mtk_wed_wo_queue_refill(wo, &wo->q_rx, true); mtk_wed_wo_queue_reset(wo, &wo->q_rx); /* rx queue irqmask */