netdev - Re: [PATCH] can: flexcan: fix deadlock when using self wakeup

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Date:   Sat, 8 Jun 2019 19:41:30 +0200
From:   Sean Nyekjaer <sean@...nix.com>
To:     Joakim Zhang <qiangqing.zhang@....com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Cc:     dl-linux-imx <linux-imx@....com>,
        "wg@...ndegger.com" <wg@...ndegger.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] can: flexcan: fix deadlock when using self wakeup



On 17/05/2019 04.39, Joakim Zhang wrote:
> As reproted by Sean Nyekjaer bellow:
> When suspending, when there is still can traffic on the
> interfaces the flexcan immediately wakes the platform again.
> As it should :-)
> But it throws this error msg:
> [ 3169.378661] PM: noirq suspend of devices failed
> 
> On the way down to suspend the interface that throws the error
> message does call flexcan_suspend but fails to call
> flexcan_noirq_suspend.
> That means the flexcan_enter_stop_mode is called, but on the way
> out of suspend the driver only calls flexcan_resume and skips
> flexcan_noirq_resume, thus it doesn't call flexcan_exit_stop_mode.
> This leaves the flexcan in stop mode, and with the current driver
> it can't recover from this even with a soft reboot, it requires a
> hard reboot.
> 
> Fixes: de3578c198c6 ("can: flexcan: add self wakeup support")
> 
> This patch intends to fix the issue, and also add comment to explain the
> wakeup flow.
> Reported-by: Sean Nyekjaer <sean@...nix.com>
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>

How is it going with the updated patch?

/Sean