From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751446AbeBUFDY (ORCPT ); Wed, 21 Feb 2018 00:03:24 -0500 Received: from alexa-out-tai-01.qualcomm.com ([103.229.16.226]:64506 "EHLO alexa-out-tai-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750842AbeBUFDV (ORCPT ); Wed, 21 Feb 2018 00:03:21 -0500 X-IronPort-AV: E=Sophos;i="5.46,542,1511798400"; d="scan'208";a="704" X-IronPort-AV: E=McAfee;i="5900,7806,8810"; a="2400693" From: Asutosh Das To: subhashj@codeaurora.org, cang@codeaurora.org, vivek.gautam@codeaurora.org, rnayak@codeaurora.org, vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, Venkat Gopalakrishnan , Asutosh Das , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 7/9] scsi: ufs: make sure all interrupts are processed Date: Wed, 21 Feb 2018 10:26:38 +0530 Message-Id: <1a8aaa1b5770fac1e2223dd08a1a80c440748317.1519120988.git.asutoshd@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Venkat Gopalakrishnan As multiple requests are submitted to the ufs host controller in parallel there could be instances where the command completion interrupt arrives later for a request that is already processed earlier as the corresponding doorbell was cleared when handling the previous interrupt. Read the interrupt status in a loop after processing the received interrupt to catch such interrupts and handle it. Signed-off-by: Venkat Gopalakrishnan Signed-off-by: Asutosh Das --- drivers/scsi/ufs/ufshcd.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 987b81b..4d4c7d6 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5406,19 +5406,30 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) u32 intr_status, enabled_intr_status; irqreturn_t retval = IRQ_NONE; struct ufs_hba *hba = __hba; + int retries = hba->nutrs; spin_lock(hba->host->host_lock); intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); - enabled_intr_status = - intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); - if (intr_status) - ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS); + /* + * There could be max of hba->nutrs reqs in flight and in worst case + * if the reqs get finished 1 by 1 after the interrupt status is + * read, make sure we handle them by checking the interrupt status + * again in a loop until we process all of the reqs before returning. + */ + do { + enabled_intr_status = + intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); + if (intr_status) + ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS); + if (enabled_intr_status) { + ufshcd_sl_intr(hba, enabled_intr_status); + retval = IRQ_HANDLED; + } + + intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); + } while (intr_status && --retries); - if (enabled_intr_status) { - ufshcd_sl_intr(hba, enabled_intr_status); - retval = IRQ_HANDLED; - } spin_unlock(hba->host->host_lock); return retval; } -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.