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 CB2E2C433FE for ; Sun, 17 Oct 2021 12:44:50 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 95F9C60F36 for ; Sun, 17 Oct 2021 12:44:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 95F9C60F36 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=GjvIUE3Ab+0oohI6hD8OFGt2pMJA4gHgWJo3+xG8DQc=; b=zMyI1k1eR4rNXl WMEr1mPxgSp2aks85qRpdXLQtAe8J/Rqi4/O7lOztcyNxDmFRJr+dxfLzFZaJKRncLgyct8QobmR2 Sh22lC/DvOKnOWlMbWE+kyToBKglS0arvR7aW/HzHgDlnz9Nvqr3knp80Ve/DlQ4k2bXIQszLKuhe 04X8TAPQufB2qV/AsgEQ9zBOdrt37BfzMWcCacJaFWA8iief/tmKFnRQENlixH5ngKNUHLYNqMj9k whgwA1F0MU6w1ZGcQVzJS/oj895rZP/LvkyV3x4fjEMpyo4nZnyRSr/iNBj5vU0EGRUNGg0M5X3ii ifOFuLnlFJ4Lx/u5LYwA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mc5Vh-00CQL1-Jg; Sun, 17 Oct 2021 12:43:29 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mc5V6-00CQ8E-14 for linux-arm-kernel@lists.infradead.org; Sun, 17 Oct 2021 12:42:54 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (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 72B9961248; Sun, 17 Oct 2021 12:42:51 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mc5V3-00HKfO-FA; Sun, 17 Oct 2021 13:42:49 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Daniel Lezcano , Will Deacon Cc: Mark Rutland , Thomas Gleixner , Peter Shier , Raghavendra Rao Ananta , Ricardo Koller , Oliver Upton , Catalin Marinas , Linus Walleij , kernel-team@android.com Subject: [PATCH v4 06/17] clocksource/arm_arch_timer: Fix MMIO base address vs callback ordering issue Date: Sun, 17 Oct 2021 13:42:14 +0100 Message-Id: <20211017124225.3018098-7-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211017124225.3018098-1-maz@kernel.org> References: <20211017124225.3018098-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, daniel.lezcano@linaro.org, will@kernel.org, mark.rutland@arm.com, tglx@linutronix.de, pshier@google.com, rananta@google.com, ricarkol@google.com, oupton@google.com, catalin.marinas@arm.com, linus.walleij@linaro.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211017_054252_187878_82043CE7 X-CRM114-Status: GOOD ( 16.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The MMIO timer base address gets published after we have registered the callbacks and the interrupt handler, which is... a bit dangerous. Fix this by moving the base address publication to the point where we register the timer, and expose a pointer to the timer structure itself rather than a naked value. Reviewed-by: Oliver Upton Reviewed-by: Mark Rutland Signed-off-by: Marc Zyngier --- drivers/clocksource/arm_arch_timer.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 8afe8c814eba..bede10f67f9a 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -54,13 +54,13 @@ static unsigned arch_timers_present __initdata; -static void __iomem *arch_counter_base __ro_after_init; - struct arch_timer { void __iomem *base; struct clock_event_device evt; }; +static struct arch_timer *arch_timer_mem __ro_after_init; + #define to_arch_timer(e) container_of(e, struct arch_timer, evt) static u32 arch_timer_rate __ro_after_init; @@ -973,9 +973,9 @@ static u64 arch_counter_get_cntvct_mem(void) u32 vct_lo, vct_hi, tmp_hi; do { - vct_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); - vct_lo = readl_relaxed(arch_counter_base + CNTVCT_LO); - tmp_hi = readl_relaxed(arch_counter_base + CNTVCT_HI); + vct_hi = readl_relaxed(arch_timer_mem->base + CNTVCT_HI); + vct_lo = readl_relaxed(arch_timer_mem->base + CNTVCT_LO); + tmp_hi = readl_relaxed(arch_timer_mem->base + CNTVCT_HI); } while (vct_hi != tmp_hi); return ((u64) vct_hi << 32) | vct_lo; @@ -1166,25 +1166,25 @@ static int __init arch_timer_mem_register(void __iomem *base, unsigned int irq) { int ret; irq_handler_t func; - struct arch_timer *t; - t = kzalloc(sizeof(*t), GFP_KERNEL); - if (!t) + arch_timer_mem = kzalloc(sizeof(*arch_timer_mem), GFP_KERNEL); + if (!arch_timer_mem) return -ENOMEM; - t->base = base; - t->evt.irq = irq; - __arch_timer_setup(ARCH_TIMER_TYPE_MEM, &t->evt); + arch_timer_mem->base = base; + arch_timer_mem->evt.irq = irq; + __arch_timer_setup(ARCH_TIMER_TYPE_MEM, &arch_timer_mem->evt); if (arch_timer_mem_use_virtual) func = arch_timer_handler_virt_mem; else func = arch_timer_handler_phys_mem; - ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &t->evt); + ret = request_irq(irq, func, IRQF_TIMER, "arch_mem_timer", &arch_timer_mem->evt); if (ret) { pr_err("Failed to request mem timer irq\n"); - kfree(t); + kfree(arch_timer_mem); + arch_timer_mem = NULL; } return ret; @@ -1442,7 +1442,6 @@ arch_timer_mem_frame_register(struct arch_timer_mem_frame *frame) return ret; } - arch_counter_base = base; arch_timers_present |= ARCH_TIMER_TYPE_MEM; return 0; -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel