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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2DC9C35273 for ; Mon, 7 Feb 2022 11:48:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388012AbiBGLme (ORCPT ); Mon, 7 Feb 2022 06:42:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1384620AbiBGL32 (ORCPT ); Mon, 7 Feb 2022 06:29:28 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 053D9C03E90D; Mon, 7 Feb 2022 03:27:42 -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 ams.source.kernel.org (Postfix) with ESMTPS id 9CB11B81158; Mon, 7 Feb 2022 11:27:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5593C004E1; Mon, 7 Feb 2022 11:27:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644233261; bh=LAVXAkoXQsExhDaUbdXPoZ77ineNb0J+l7mx3Kv2fAw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MhUf0Eq8/fx9heHkzPgIEA1/pln1yyRBbqpdstq5cettvV1BKQ1TCdVZPZxl0TwKj F/ebaQX6sSacnOUd53T54r8stPkkUoFfZA+63XEgymai0GTU9/up1M0OnnH0tgeW7u DFNfvAkCtep0GvCxAwLHoSe1AixR2A7LSzXIw9+E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kamal Dasu , Florian Fainelli , Mark Brown Subject: [PATCH 5.15 050/110] spi: bcm-qspi: check for valid cs before applying chip select Date: Mon, 7 Feb 2022 12:06:23 +0100 Message-Id: <20220207103803.976347918@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220207103802.280120990@linuxfoundation.org> References: <20220207103802.280120990@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kamal Dasu commit 2cbd27267ffe020af1442b95ec57f59a157ba85c upstream. Apply only valid chip select value. This change fixes case where chip select is set to initial value of '-1' during probe and PM supend and subsequent resume can try to use the value with undefined behaviour. Also in case where gpio based chip select, the check in bcm_qspi_chip_select() shall prevent undefined behaviour on resume. Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver") Signed-off-by: Kamal Dasu Acked-by: Florian Fainelli Link: https://lore.kernel.org/r/20220127185359.27322-1-kdasu.kdev@gmail.com Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-bcm-qspi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -552,7 +552,7 @@ static void bcm_qspi_chip_select(struct u32 rd = 0; u32 wr = 0; - if (qspi->base[CHIP_SELECT]) { + if (cs >= 0 && qspi->base[CHIP_SELECT]) { rd = bcm_qspi_read(qspi, CHIP_SELECT, 0); wr = (rd & ~0xff) | (1 << cs); if (rd == wr)