From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBDC0C0650F for ; Mon, 5 Aug 2019 13:04:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6FD362087B for ; Mon, 5 Aug 2019 13:04:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565010296; bh=zmi6DxT3EhLOR5sEtz3wlVtU2AHbkSBARiH7Prqw1qY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=f8XFUhhdQcO3ruMKtT16NbeE6KUbgLwoXcmt9C656bmZsDjj3sj4qk91Zapz/97U1 E3mmK0HnltT0Jk0hm14xIBzvTdWxobsxtUkydl/wZqs+Fpbtm2PdM3IbyJS9qAkIjT EZrWDFGFcSyLKSAjMa4UkSlchY5eSSlCYIlvx8Wg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729174AbfHENEz (ORCPT ); Mon, 5 Aug 2019 09:04:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:40634 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729121AbfHENEt (ORCPT ); Mon, 5 Aug 2019 09:04:49 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C77E12087B; Mon, 5 Aug 2019 13:04:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565010289; bh=zmi6DxT3EhLOR5sEtz3wlVtU2AHbkSBARiH7Prqw1qY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mzhDeCxqWC0LHRflLpjU5fcrVjflVoQqDRNuL61toyhzBE9+khQgrpJHSMVXL++7F le09vP5+kaQWnEdNPFQyRlmMk59e2b4215B5Y8iUjIObhyHl+xQul9lAex5liSmPAL wRwcVWK+sczszBhMwkH2QUvpS0akpQn1e372qWWE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Russell King , Sasha Levin Subject: [PATCH 4.9 01/42] ARM: riscpc: fix DMA Date: Mon, 5 Aug 2019 15:02:27 +0200 Message-Id: <20190805124924.996748516@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190805124924.788666484@linuxfoundation.org> References: <20190805124924.788666484@linuxfoundation.org> User-Agent: quilt/0.66 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit ffd9a1ba9fdb7f2bd1d1ad9b9243d34e96756ba2 ] DMA got broken a while back in two different ways: 1) a change in the behaviour of disable_irq() to wait for the interrupt to finish executing causes us to deadlock at the end of DMA. 2) a change to avoid modifying the scatterlist left the first transfer uninitialised. DMA is only used with expansion cards, so has gone unnoticed. Fixes: fa4e99899932 ("[ARM] dma: RiscPC: don't modify DMA SG entries") Signed-off-by: Russell King Signed-off-by: Sasha Levin --- arch/arm/mach-rpc/dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-rpc/dma.c b/arch/arm/mach-rpc/dma.c index 6d3517dc4772a..82aac38fa2cff 100644 --- a/arch/arm/mach-rpc/dma.c +++ b/arch/arm/mach-rpc/dma.c @@ -131,7 +131,7 @@ static irqreturn_t iomd_dma_handle(int irq, void *dev_id) } while (1); idma->state = ~DMA_ST_AB; - disable_irq(irq); + disable_irq_nosync(irq); return IRQ_HANDLED; } @@ -174,6 +174,9 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma) DMA_FROM_DEVICE : DMA_TO_DEVICE); } + idma->dma_addr = idma->dma.sg->dma_address; + idma->dma_len = idma->dma.sg->length; + iomd_writeb(DMA_CR_C, dma_base + CR); idma->state = DMA_ST_AB; } -- 2.20.1