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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 0F345C433E0 for ; Sat, 8 Aug 2020 23:46:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D52B020672 for ; Sat, 8 Aug 2020 23:46:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596930372; bh=e8/hC67URr55Z95bIdmfp2EdNaPne94nAC6wdFLFnB4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=YfdpYWm307tqxbU8+2snHDGLVNH0dofb0UOH9e72umKXlbLHxKZej+vVBDfHr+AIZ Yw3acI6azUgW1fwk+SNgtdMaqi90hzpMcgkqMH90+ZE0Tl0l0KcGyN1tT5wgu1sxHA bYkaLiHKtJndNb1N2I9rmmIbv3Rs4YnKpMV1RYMo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728631AbgHHXqL (ORCPT ); Sat, 8 Aug 2020 19:46:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:52330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726677AbgHHXi0 (ORCPT ); Sat, 8 Aug 2020 19:38:26 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D56AC2073E; Sat, 8 Aug 2020 23:38:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929905; bh=e8/hC67URr55Z95bIdmfp2EdNaPne94nAC6wdFLFnB4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=izAFt1LG8T9jixWiZEPkNXNUy6d/4WYw9M3MYq+qud+H2maDxe+pzB46PHdg4wvzp MU1v/9FB7giKhYZ3vKR581+nVQIHMOL0EwKT+5m+eJPOGz9MFNltMV8V29jon32S5Y v4TrX6kwlVdj+LSTYoXXuxduqspaQh4BMmYFF+IY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jon Lin , Emil Renner Berthing , Heiko Stuebner , Mark Brown , Sasha Levin , linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH AUTOSEL 5.7 44/58] spi: rockchip: Fix error in SPI slave pio read Date: Sat, 8 Aug 2020 19:37:10 -0400 Message-Id: <20200808233724.3618168-44-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233724.3618168-1-sashal@kernel.org> References: <20200808233724.3618168-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jon Lin [ Upstream commit 4294e4accf8d695ea5605f6b189008b692e3e82c ] The RXFLR is possible larger than rx_left in Rockchip SPI, fix it. Fixes: 01b59ce5dac8 ("spi: rockchip: use irq rather than polling") Signed-off-by: Jon Lin Tested-by: Emil Renner Berthing Reviewed-by: Heiko Stuebner Reviewed-by: Emil Renner Berthing Link: https://lore.kernel.org/r/20200723004356.6390-3-jon.lin@rock-chips.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-rockchip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 70ef63e0b6b8d..02e9205355910 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -286,7 +286,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs) static void rockchip_spi_pio_reader(struct rockchip_spi *rs) { u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); - u32 rx_left = rs->rx_left - words; + u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0; /* the hardware doesn't allow us to change fifo threshold * level while spi is enabled, so instead make sure to leave -- 2.25.1