From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 05F9926BD90; Tue, 11 Feb 2025 06:44:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739256287; cv=none; b=HjOeEuj5bO6294EkWgZGEp8HKkx53AEJ8ZlhMPLOFadjESCQDTDvr+ALq2lK8Fw1FW4xjMWYmdotVQfYgR/9h83V+NYlJor/GLN+hnpcNbWAKpX2azlF008snoJZGV3Kv4LZM6RspaSQuXIwOWzPxynRKoKNe90ijBhYBSvQAZI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739256287; c=relaxed/simple; bh=NCyVfDIX0SRvprF8hupDS+zjKAdjMv9UmBS8H7XYoeU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YSAZZEFS6WhoHfPItGggPC6h6GWkk85q0lsNZMVsPQa4RQLNOX7hfumhAcJ5tYPyVZikNcm+RkNhZcpNR3Asf6/daOCIxoiytggVlqOU488clYlqzKStapNOyzWr2+g86CdSGk3FwdXUPN2KILqII4t+6AJYe1HuZJ5lwLzco6c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VQQngsmA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="VQQngsmA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF6F8C4CEDD; Tue, 11 Feb 2025 06:44:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739256286; bh=NCyVfDIX0SRvprF8hupDS+zjKAdjMv9UmBS8H7XYoeU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VQQngsmAAbS4lLB3FmvvAzOT+VP8iRabAq8ygVgtDGhRRPDNK+N1nfH51QWZCWz6f ri+KV1UcTN0ZKTei48OszF6wuL15E+uIv8ht5B4WLQttxBMC3GlVl1H5KzdXfaTFJe TDOG6tPmrotnodYJLIwT4ocVqnWQdVchm3+z5uxI= Date: Tue, 11 Feb 2025 07:43:43 +0100 From: Greg KH To: Xu Yang Cc: rafael@kernel.org, len.brown@intel.com, pavel@kernel.org, dakr@kernel.org, stern@rowland.harvard.edu, linux-pm@vger.kernel.org, imx@lists.linux.dev, jun.li@nxp.com Subject: Re: [PATCH] PM: sleep: core: Set is_prepared to false before checking direct_complete Message-ID: <2025021127-cofounder-spinning-ba7d@gregkh> References: <20250211034423.833783-1-xu.yang_2@nxp.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250211034423.833783-1-xu.yang_2@nxp.com> On Tue, Feb 11, 2025 at 11:44:23AM +0800, Xu Yang wrote: > Currently, if power.no_callbacks is true for a device, device_prepare() > will also set power.direct_complete to true. When device_resume() check > power.direct_complete, setting power.is_prepared will be skipped if it > can directly complete. This will cause a warning when add new devices > during resume() stage. > > Although power.is_prepared should be cleared in complete() state, commit > (f76b168b6f11 PM: Rename dev_pm_info.in_suspend to is_prepared) allow > clear it in earlier resume() stage. However, we need set is_prepared to > false before checking direct_complete after including direct complete > support. > > Take USB as example: > The usb_interface is such a device which setting power.no_callbacks to > true. Then if the user call usb_set_interface() during resume() stage, > the kernel will print below warning since the system will create and > add ep devices. > > [ 186.461414] usb 1-1: reset high-speed USB device number 3 using ci_hdrc > [ 187.102681] ep_81: PM: parent 1-1:1.1 should not be sleeping > [ 187.105010] PM: resume devices took 0.936 seconds > > Fixes: aae4518b3124 ("PM / sleep: Mechanism to avoid resuming runtime-suspended devices unnecessarily") > Signed-off-by: Xu Yang > --- > drivers/base/power/main.c | 12 ++++++------ > 1 file changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c > index 40e1d8d8a589..69d0f9ca7051 100644 > --- a/drivers/base/power/main.c > +++ b/drivers/base/power/main.c > @@ -929,6 +929,12 @@ static void device_resume(struct device *dev, pm_message_t state, bool async) > if (dev->power.syscore) > goto Complete; > > + /* > + * This is a fib. But we'll allow new children to be added below > + * a resumed device, even if the device hasn't been completed yet. > + */ > + dev->power.is_prepared = false; > + > if (dev->power.direct_complete) { > /* Match the pm_runtime_disable() in device_suspend(). */ > pm_runtime_enable(dev); > @@ -941,12 +947,6 @@ static void device_resume(struct device *dev, pm_message_t state, bool async) > dpm_watchdog_set(&wd, dev); > device_lock(dev); > > - /* > - * This is a fib. But we'll allow new children to be added below > - * a resumed device, even if the device hasn't been completed yet. > - */ > - dev->power.is_prepared = false; > - > if (!dev->power.is_suspended) > goto Unlock; > > -- > 2.34.1 > Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - You have marked a patch with a "Fixes:" tag for a commit that is in an older released kernel, yet you do not have a cc: stable line in the signed-off-by area at all, which means that the patch will not be applied to any older kernel releases. To properly fix this, please follow the documented rules in the Documentation/process/stable-kernel-rules.rst file for how to resolve this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot