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

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Date:   Fri, 14 Jul 2023 11:05:44 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        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 Wed, Jul 12, 2023 at 11:56:33PM +0530, Krishna Kurapati PSSNV wrote:
> 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/

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

Or just use devm_kasprintf(), which should allow for a cleaner
implementation.

I've fixed it up like this for my X13s wip branches:

	https://github.com/jhovold/linux/commit/0898b54456bc2f4bd4d420480db98e6758771ace
 
>    Are you fine with seperating out setup_irq and setup_mp_irq functions 
> ? Can you please review comments and suggestion on [1].

I haven't had time to look at your latest replies yet, but as I already
said when reviewing v9, it seems you should be using a common helper for
non-mp and mp.

Johan