linux-kernel - Re: [PATCH V3 08/11] accel/amdxdna: Add suspend and resume

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Message-ID: <c6db82a0-7658-e840-0d1c-c748ed298e77@amd.com>
Date: Mon, 7 Oct 2024 22:52:35 -0700
From: Lizhi Hou <lizhi.hou@....com>
To: Jeffrey Hugo <quic_jhugo@...cinc.com>, <ogabbay@...nel.org>,
	<dri-devel@...ts.freedesktop.org>
CC: <linux-kernel@...r.kernel.org>, <min.ma@....com>, <max.zhen@....com>,
	<sonal.santan@....com>, <king.tam@....com>, Narendra Gutta
	<VenkataNarendraKumar.Gutta@....com>, Xiaoming Ren <xiaoming.ren@....com>
Subject: Re: [PATCH V3 08/11] accel/amdxdna: Add suspend and resume


On 10/4/24 11:08, Jeffrey Hugo wrote:
> On 9/11/2024 12:06 PM, Lizhi Hou wrote:
>> +static int amdxdna_rpmops_suspend(struct device *dev)
>> +{
>> +    struct amdxdna_dev *xdna = pci_get_drvdata(to_pci_dev(dev));
>> +    int ret;
>> +
>> +    mutex_lock(&xdna->dev_lock);
>> +    WARN_ON(!list_empty(&xdna->client_list));
>
> This feels weird. Can you explain?

The driver uses auto suspend. When there is opened client, auto suspend 
is held. So the client list should not be empty here.  The WARN_ON is 
kind of assert and  can be removed.


Thanks,

Lizhi

>
>> +    ret = amdxdna_dev_suspend_nolock(xdna);
>> +    mutex_unlock(&xdna->dev_lock);
>> +
>> +    XDNA_DBG(xdna, "Runtime suspend done ret: %d", ret);
>> +    return ret;
>> +}
>> +