linux-kernel - Re: [PATCH] pinctrl: qcom: Fix logic error when TLMM reg-names property is missing

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Message-ID: <aIA+lmqOMRtXTvsl@yuanjiey.ap.qualcomm.com>
Date: Wed, 23 Jul 2025 09:44:54 +0800
From: yuanjiey <yuanjie.yang@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: andersson@...nel.org, linus.walleij@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@....qualcomm.com,
        quic_tingweiz@...cinc.com, quic_yuanjiey@...cinc.com
Subject: Re: [PATCH] pinctrl: qcom: Fix logic error when TLMM reg-names
 property is missing

On Tue, Jul 22, 2025 at 09:38:51AM +0300, Dmitry Baryshkov wrote:
> On Tue, Jul 22, 2025 at 01:44:46PM +0800, yuanjie yang wrote:
> > From: Yuanjie Yang <yuanjie.yang@....qualcomm.com>
> > 
> > Some Qualcomm platforms, such as sm8750.dtsi, define a single TLMM
> > region without the reg-names property. This is a valid and expected
> > configuration. However, the current code incorrectly treats the absence
> > of reg-names as an error, resulting in unintended behavior.
> > 
> > Refactoring the logic to handle both cases correctly:
> 
> s/Refactoring/Refactor/g

will update.
 
> > If only the gpio parameter is provided, default to TLMM region 0.
> > If both gpio and name are provided, compare the reg-names entries in the
> > TLMM node with the given name to select the appropriate region.
> > 
> > This ensures proper handling of platforms with either single or multiple
> > TLMM regions.
> 
> Drop this sentence.
will update.

> > 
> > Fixes: 56ffb63749f4 ("pinctrl: qcom: add multi TLMM region option parameter")
> > 
> > Signed-off-by: Yuanjie Yang <yuanjie.yang@....qualcomm.com>
> 
> No empty lines between the tags.
will update.

> > ---
> >  drivers/pinctrl/qcom/tlmm-test.c | 32 ++++++++++++++++----------------
> >  1 file changed, 16 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/pinctrl/qcom/tlmm-test.c b/drivers/pinctrl/qcom/tlmm-test.c
> > index 7d7fff538755..6de8cf23f9f0 100644
> > --- a/drivers/pinctrl/qcom/tlmm-test.c
> > +++ b/drivers/pinctrl/qcom/tlmm-test.c
> > @@ -581,25 +581,25 @@ static int tlmm_reg_base(struct device_node *tlmm, struct resource *res)
> >  	int ret;
> >  	int i;
> >  
> > -	count = of_property_count_strings(tlmm, "reg-names");
> > -	if (count <= 0) {
> > -		pr_err("failed to find tlmm reg name\n");
> > -		return count;
> > -	}
> > -
> > -	reg_names = kcalloc(count, sizeof(char *), GFP_KERNEL);
> > -	if (!reg_names)
> > -		return -ENOMEM;
> > -
> > -	ret = of_property_read_string_array(tlmm, "reg-names", reg_names, count);
> > -	if (ret != count) {
> > -		kfree(reg_names);
> > -		return -EINVAL;
> > -	}
> > -
> >  	if (!strcmp(tlmm_reg_name, "default_region")) {
> >  		ret = of_address_to_resource(tlmm, 0, res);
> 
> return here and remove braces around the else clause. It's strange that
> you didn't get the warning about calling kfree on the uninitialized
> variable.
Thanks, will remove braces and fix kfree issue.

> >  	} else {
> > +		count = of_property_count_strings(tlmm, "reg-names");
> > +		if (count <= 0) {
> > +			pr_err("failed to find tlmm reg name\n");
> > +			return -EINVAL;
> > +		}
> > +
> > +		reg_names = kcalloc(count, sizeof(char *), GFP_KERNEL);
> > +		if (!reg_names)
> > +			return -ENOMEM;
> > +
> > +		ret = of_property_read_string_array(tlmm, "reg-names", reg_names, count);
> > +		if (ret != count) {
> > +			kfree(reg_names);
> > +			return -EINVAL;
> > +		}
> > +
> >  		for (i = 0; i < count; i++) {
> >  			if (!strcmp(reg_names[i], tlmm_reg_name)) {
> >  				ret = of_address_to_resource(tlmm, i, res);
> > 
> > base-commit: d086c886ceb9f59dea6c3a9dae7eb89e780a20c9
> > -- 
> > 2.34.1
> > 
> 
> -- 
> With best wishes
> Dmitry

Thanks,
Yuanjie