From patchwork Mon Jan 24 18:41:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 535753 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 EDECDC4332F for ; Mon, 24 Jan 2022 20:43:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359008AbiAXUnW (ORCPT ); Mon, 24 Jan 2022 15:43:22 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:35354 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1389010AbiAXUkW (ORCPT ); Mon, 24 Jan 2022 15:40:22 -0500 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 dfw.source.kernel.org (Postfix) with ESMTPS id C771961372; Mon, 24 Jan 2022 20:40:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87A91C340E5; Mon, 24 Jan 2022 20:40:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643056821; bh=+2CGRR58hyrC+e0/rwMd7vvHpmue7xOZCLaTjHMreKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HowtncY5Wvn2XYoLYcUTR93HuOQXzuxp4HmNpYnkxAyjlr9sA9w7wEPkNgTRZSe1Q PSFVLH3Szc1Vv+WivTgPQ8JpoEjABKqHmcgdzZNxt8e5D0XfaQ3U6VWiczKKZuD6Xn vypnePK1SX1v3o14ne2zdalEoqDjhW9B0MgLq3HM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Luca Coelho , Sasha Levin Subject: [PATCH 5.15 579/846] iwlwifi: pcie: make sure prph_info is set when treating wakeup IRQ Date: Mon, 24 Jan 2022 19:41:36 +0100 Message-Id: <20220124184121.016112149@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124184100.867127425@linuxfoundation.org> References: <20220124184100.867127425@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Luca Coelho [ Upstream commit 459fc0f2c6b0f6e280bfa0f230c100c9dfe3a199 ] In some rare cases when the HW is in a bad state, we may get this interrupt when prph_info is not set yet. Then we will try to dereference it to check the sleep_notif element, which will cause an oops. Fix that by ignoring the interrupt if prph_info is not set yet. Signed-off-by: Luca Coelho Link: https://lore.kernel.org/r/iwlwifi.20211219132536.0537aa562313.I183bb336345b9b3da196ba9e596a6f189fbcbd09@changeid Signed-off-by: Luca Coelho Signed-off-by: Sasha Levin --- drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c index 8e45eb38304b2..fea89330f692c 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -2261,7 +2261,12 @@ irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id) } } - if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP) { + /* + * In some rare cases when the HW is in a bad state, we may + * get this interrupt too early, when prph_info is still NULL. + * So make sure that it's not NULL to prevent crashing. + */ + if (inta_hw & MSIX_HW_INT_CAUSES_REG_WAKEUP && trans_pcie->prph_info) { u32 sleep_notif = le32_to_cpu(trans_pcie->prph_info->sleep_notif); if (sleep_notif == IWL_D3_SLEEP_STATUS_SUSPEND ||