linux-kernel - Re: [PATCH v4 03/14] soc: mediatek: mtk-svs: enable the IRQ later

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Message-ID: <7336156c-9451-bc59-2bd3-26c1b7809bb5@gmail.com>
Date:   Wed, 1 Feb 2023 14:47:46 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Roger Lu (陸瑞傑) <Roger.Lu@...iatek.com>,
        "eballetbo@...il.com" <eballetbo@...il.com>,
        "khilman@...nel.org" <khilman@...nel.org>,
        "drinkcat@...gle.com" <drinkcat@...gle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "ribalda@...omium.org" <ribalda@...omium.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Jia-wei Chang (張佳偉) 
        <Jia-wei.Chang@...iatek.com>,
        Fan Chen (陳凡) <fan.chen@...iatek.com>
Subject: Re: [PATCH v4 03/14] soc: mediatek: mtk-svs: enable the IRQ later



On 01/02/2023 14:43, Roger Lu (陸瑞傑) wrote:
> Hi Matthias Sir,
> 
> On Tue, 2023-01-31 at 13:59 +0100, Matthias Brugger wrote:
>>
>> On 11/01/2023 08:45, Roger Lu wrote:
>>> From: Ricardo Ribalda <ribalda@...omium.org>
>>>
>>> If the system does not come from reset (like when is booted via
>>> kexec(), the peripheral might trigger an IRQ before the data structures
>>> are initialized.
>>>
>>> Fixes:
>>>
>>> [    0.227710] Unable to handle kernel NULL pointer dereference at virtual
>>> address 0000000000000f08
>>> [    0.227913] Call trace:
>>> [    0.227918]  svs_isr+0x8c/0x538
>>>
>>
>> This patch is different from
>> https://lore.kernel.org/r/20221127-mtk-svs-v2-0-145b07663ea8@chromium.org
>>
>> If you think the patch from Ricardo is wrong, then you should have mentioned
>> that in the review.
> 
> My bad. Ricardo's patch is correct. Moving platform_get_irq() brings no
> functional change and is for helping the svs probe readability as my preference.
> 

Thanks for the confirmation!

Regards,
Matthias

>>
>> Regards,
>> Matthias
>>
>>> Fixes: 681a02e95000 ("soc: mediatek: SVS: introduce MTK SVS engine")
>>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>>> Signed-off-by: Roger Lu <roger.lu@...iatek.com>
>>> ---
>>>    drivers/soc/mediatek/mtk-svs.c | 28 ++++++++++++++--------------
>>>    1 file changed, 14 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
>>> index a803b92afc3d..64d4d03ab71c 100644
>>> --- a/drivers/soc/mediatek/mtk-svs.c
>>> +++ b/drivers/soc/mediatek/mtk-svs.c
>>> @@ -2403,20 +2403,6 @@ static int svs_probe(struct platform_device *pdev)
>>>    		goto svs_probe_free_resource;
>>>    	}
>>>    
>>> -	svsp_irq = platform_get_irq(pdev, 0);
>>> -	if (svsp_irq < 0) {
>>> -		ret = svsp_irq;
>>> -		goto svs_probe_free_resource;
>>> -	}
>>> -
>>> -	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
>>> -					IRQF_ONESHOT, svsp->name, svsp);
>>> -	if (ret) {
>>> -		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
>>> -			svsp_irq, ret);
>>> -		goto svs_probe_free_resource;
>>> -	}
>>> -
>>>    	svsp->main_clk = devm_clk_get(svsp->dev, "main");
>>>    	if (IS_ERR(svsp->main_clk)) {
>>>    		dev_err(svsp->dev, "failed to get clock: %ld\n",
>>> @@ -2438,6 +2424,20 @@ static int svs_probe(struct platform_device *pdev)
>>>    		goto svs_probe_clk_disable;
>>>    	}
>>>    
>>> +	svsp_irq = platform_get_irq(pdev, 0);
>>> +	if (svsp_irq < 0) {
>>> +		ret = svsp_irq;
>>> +		goto svs_probe_iounmap;
>>> +	}
>>> +
>>> +	ret = devm_request_threaded_irq(svsp->dev, svsp_irq, NULL, svs_isr,
>>> +					IRQF_ONESHOT, svsp->name, svsp);
>>> +	if (ret) {
>>> +		dev_err(svsp->dev, "register irq(%d) failed: %d\n",
>>> +			svsp_irq, ret);
>>> +		goto svs_probe_iounmap;
>>> +	}
>>> +
>>>    	ret = svs_start(svsp);
>>>    	if (ret) {
>>>    		dev_err(svsp->dev, "svs start fail: %d\n", ret);