linux-kernel - Re: [PATCH v9 06/10] usb: dwc3: qcom: Add support to read IRQ's related to multiport

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Date:   Wed, 12 Jul 2023 23:56:33 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Johan Hovold <johan@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Andy Gross" <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        "Wesley Cheng" <quic_wcheng@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_pkondeti@...cinc.com>, <quic_ppratap@...cinc.com>,
        <quic_jackp@...cinc.com>, <quic_harshq@...cinc.com>,
        <ahalaney@...hat.com>, <quic_shazhuss@...cinc.com>
Subject: Re: [PATCH v9 06/10] usb: dwc3: qcom: Add support to read IRQ's
 related to multiport



On 7/12/2023 5:42 PM, Johan Hovold wrote:
> On Wed, Jun 21, 2023 at 10:06:24AM +0530, Krishna Kurapati wrote:
>> Add support to read Multiport IRQ's related to quad port controller
>> of SA8295 Device.
>>
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>>   drivers/usb/dwc3/dwc3-qcom.c | 108 +++++++++++++++++++++++++++++------
>>   1 file changed, 91 insertions(+), 17 deletions(-)
> 
>> +static int dwc3_qcom_setup_mp_irq(struct platform_device *pdev)
>> +{
>> +	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>> +	char irq_name[15];
> 
> The interrupt device-name string can not be allocated on the stack or
> reused as it is stored directly in each irqaction structure.
> 
> This can otherwise lead to random crashes when accessing
> /proc/interrupts:
> 
> 	https://lore.kernel.org/lkml/ZK6IV_jJPICX5r53@hovoldconsulting.com/
> 
Hi Johan,

   Sure, will create a static array of names if possible in global 
section of file and use it to read interrupts.

   Are you fine with seperating out setup_irq and setup_mp_irq functions 
? Can you please review comments and suggestion on [1].

[1]: 
https://lore.kernel.org/all/bf62bdf4-cc9e-ba7b-2078-cfd60f5dd237@quicinc.com/

Regards,
Krishna,

>> +	int irq;
>> +	int ret;
>> +	int i;
>> +
>> +	for (i = 0; i < 4; i++) {
>> +		if (qcom->dp_hs_phy_irq[i])
>> +			continue;
>> +
>> +		sprintf(irq_name, "dp%d_hs_phy_irq", i+1);
>> +		irq = dwc3_qcom_get_irq(pdev, irq_name, -1);
>> +		if (irq > 0) {
>> +			irq_set_status_flags(irq, IRQ_NOAUTOEN);
>> +			ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
>> +					qcom_dwc3_resume_irq,
>> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
>> +					irq_name, qcom);
>> +			if (ret) {
>> +				dev_err(qcom->dev, "%s failed: %d\n", irq_name, ret);
>> +				return ret;
>> +			}
>> +		}
>> +
>> +		qcom->dp_hs_phy_irq[i] = irq;
>> +	}
> 
> Johan