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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73E3EC4332F for ; Mon, 11 Oct 2021 14:05:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E64661355 for ; Mon, 11 Oct 2021 14:05:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241508AbhJKOH2 (ORCPT ); Mon, 11 Oct 2021 10:07:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:56434 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237229AbhJKOF2 (ORCPT ); Mon, 11 Oct 2021 10:05:28 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3F4FF60F4B; Mon, 11 Oct 2021 13:59:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1633960786; bh=MRL4PqBzIy1GDWyQEqU832b6y/V26i3Oc2G3ET1vU0k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UlPuwZWaVNeleOYaVgPEed2xpGNnjEsDPChl6QtE/LiMFZwQIV1sJQ3gfcX6RdfIW ynov6Doz0s36aXroXp3piNw0YUGEfyHhwejNertdc98HRifY8J0pXGyJmDhvGyXUmK 3ck9QRu4QgcvURmveeJkq6qgZEREBp3B+LP1GpXc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eugen Hristev , Claudiu Beznea , Nicolas Ferre , Sasha Levin Subject: [PATCH 5.14 040/151] ARM: at91: pm: do not panic if ram controllers are not enabled Date: Mon, 11 Oct 2021 15:45:12 +0200 Message-Id: <20211011134519.145230545@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211011134517.833565002@linuxfoundation.org> References: <20211011134517.833565002@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: stable@vger.kernel.org From: Claudiu Beznea [ Upstream commit 1605de1b3ca66e3eddbca4b3c353c13c26476fe2 ] In case PM is enabled but there is no RAM controller information in DT the code will panic. Avoid such scenarios by not initializing platform specific PM code in case RAM controller is not provided via DT. Reported-by: Eugen Hristev Fixes: 827de1f123ba0 ("ARM: at91: remove at91_dt_initialize and machine init_early()") Fixes: 892e1f4a3ae58 ("ARM: at91: pm: add sama7g5 ddr phy controller") Signed-off-by: Claudiu Beznea Signed-off-by: Nicolas Ferre Link: https://lore.kernel.org/r/20210823131915.23857-2-claudiu.beznea@microchip.com Signed-off-by: Sasha Levin --- arch/arm/mach-at91/pm.c | 58 +++++++++++++++++++++++++++++++++-------- 1 file changed, 47 insertions(+), 11 deletions(-) diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index 90dcdfe3b3d0..2dee383f9050 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -514,18 +514,22 @@ static const struct of_device_id ramc_ids[] __initconst = { { /*sentinel*/ } }; -static __init void at91_dt_ramc(void) +static __init int at91_dt_ramc(void) { struct device_node *np; const struct of_device_id *of_id; int idx = 0; void *standby = NULL; const struct ramc_info *ramc; + int ret; for_each_matching_node_and_match(np, ramc_ids, &of_id) { soc_pm.data.ramc[idx] = of_iomap(np, 0); - if (!soc_pm.data.ramc[idx]) - panic(pr_fmt("unable to map ramc[%d] cpu registers\n"), idx); + if (!soc_pm.data.ramc[idx]) { + pr_err("unable to map ramc[%d] cpu registers\n", idx); + ret = -ENOMEM; + goto unmap_ramc; + } ramc = of_id->data; if (!standby) @@ -535,15 +539,26 @@ static __init void at91_dt_ramc(void) idx++; } - if (!idx) - panic(pr_fmt("unable to find compatible ram controller node in dtb\n")); + if (!idx) { + pr_err("unable to find compatible ram controller node in dtb\n"); + ret = -ENODEV; + goto unmap_ramc; + } if (!standby) { pr_warn("ramc no standby function available\n"); - return; + return 0; } at91_cpuidle_device.dev.platform_data = standby; + + return 0; + +unmap_ramc: + while (idx) + iounmap(soc_pm.data.ramc[--idx]); + + return ret; } static void at91rm9200_idle(void) @@ -866,6 +881,8 @@ static void __init at91_pm_init(void (*pm_idle)(void)) void __init at91rm9200_pm_init(void) { + int ret; + if (!IS_ENABLED(CONFIG_SOC_AT91RM9200)) return; @@ -877,7 +894,9 @@ void __init at91rm9200_pm_init(void) soc_pm.data.standby_mode = AT91_PM_STANDBY; soc_pm.data.suspend_mode = AT91_PM_ULP0; - at91_dt_ramc(); + ret = at91_dt_ramc(); + if (ret) + return; /* * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh. @@ -892,13 +911,17 @@ void __init sam9x60_pm_init(void) static const int modes[] __initconst = { AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1, }; + int ret; if (!IS_ENABLED(CONFIG_SOC_SAM9X60)) return; at91_pm_modes_validate(modes, ARRAY_SIZE(modes)); at91_pm_modes_init(); - at91_dt_ramc(); + ret = at91_dt_ramc(); + if (ret) + return; + at91_pm_init(NULL); soc_pm.ws_ids = sam9x60_ws_ids; @@ -907,6 +930,8 @@ void __init sam9x60_pm_init(void) void __init at91sam9_pm_init(void) { + int ret; + if (!IS_ENABLED(CONFIG_SOC_AT91SAM9)) return; @@ -918,7 +943,10 @@ void __init at91sam9_pm_init(void) soc_pm.data.standby_mode = AT91_PM_STANDBY; soc_pm.data.suspend_mode = AT91_PM_ULP0; - at91_dt_ramc(); + ret = at91_dt_ramc(); + if (ret) + return; + at91_pm_init(at91sam9_idle); } @@ -927,12 +955,16 @@ void __init sama5_pm_init(void) static const int modes[] __initconst = { AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, }; + int ret; if (!IS_ENABLED(CONFIG_SOC_SAMA5)) return; at91_pm_modes_validate(modes, ARRAY_SIZE(modes)); - at91_dt_ramc(); + ret = at91_dt_ramc(); + if (ret) + return; + at91_pm_init(NULL); } @@ -942,13 +974,17 @@ void __init sama5d2_pm_init(void) AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1, AT91_PM_BACKUP, }; + int ret; if (!IS_ENABLED(CONFIG_SOC_SAMA5D2)) return; at91_pm_modes_validate(modes, ARRAY_SIZE(modes)); at91_pm_modes_init(); - at91_dt_ramc(); + ret = at91_dt_ramc(); + if (ret) + return; + at91_pm_init(NULL); soc_pm.ws_ids = sama5d2_ws_ids; -- 2.33.0