Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932233AbdGCQle (ORCPT ); Mon, 3 Jul 2017 12:41:34 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:36618 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932087AbdGCQla (ORCPT ); Mon, 3 Jul 2017 12:41:30 -0400 From: Sudeep Holla To: LKML , Jassi Brar Cc: Sudeep Holla , Alexey Klimov , Jassi Brar Subject: [UPDATE][PATCH 1/2] mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone Date: Mon, 3 Jul 2017 17:41:13 +0100 Message-Id: <1499100073-18345-1-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1498835681-23975-1-git-send-email-sudeep.holla@arm.com> References: <1498835681-23975-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2155 Lines: 57 Currently the mailbox framework sets txdone_method to TXDONE_BY_POLL if the controller sets txdone_by_poll. However some clients can have a mechanism to do TXDONE_BY_ACK which they can specify by knows_txdone. However, we endup setting both TXDONE_BY_POLL and TXDONE_BY_ACK in that case. In such scenario, we may end up with below warnings as the tx ticker is run both by mailbox framework and the client. WARNING: CPU: 1 PID: 0 at kernel/time/hrtimer.c:805 hrtimer_forward+0x88/0xd8 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc5 #242 Hardware name: ARM LTD ARM Juno Development Platform task: ffff8009768ca700 task.stack: ffff8009768f8000 PC is at hrtimer_forward+0x88/0xd8 LR is at txdone_hrtimer+0xd4/0xf8 Call trace: hrtimer_forward+0x88/0xd8 __hrtimer_run_queues+0xe4/0x158 hrtimer_interrupt+0xa4/0x220 arch_timer_handler_phys+0x30/0x40 handle_percpu_devid_irq+0x78/0x130 generic_handle_irq+0x24/0x38 __handle_domain_irq+0x5c/0xb8 gic_handle_irq+0x54/0xa8 This patch fixes the issue by resetting TXDONE_BY_POLL if client has set knows_txdone. Cc: Alexey Klimov Cc: Jassi Brar Signed-off-by: Sudeep Holla --- drivers/mailbox/mailbox.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 537f4f6d009b..674b35f402f5 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -351,7 +351,7 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) init_completion(&chan->tx_complete); if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) - chan->txdone_method |= TXDONE_BY_ACK; + chan->txdone_method = TXDONE_BY_ACK; spin_unlock_irqrestore(&chan->lock, flags); @@ -418,7 +418,7 @@ void mbox_free_channel(struct mbox_chan *chan) spin_lock_irqsave(&chan->lock, flags); chan->cl = NULL; chan->active_req = NULL; - if (chan->txdone_method == (TXDONE_BY_POLL | TXDONE_BY_ACK)) + if (chan->txdone_method == TXDONE_BY_ACK) chan->txdone_method = TXDONE_BY_POLL; module_put(chan->mbox->dev->driver->owner); -- 2.7.4