linux-kernel - Re: [PATCH 1/8] platform/x86/intel/pmc: Fix in mtl_punit_pmt

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Message-ID: <ce6c3a2e-0500-4246-a331-17148622c886@redhat.com>
Date: Tue, 19 Dec 2023 16:49:53 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: rjingar <rajvi.jingar@...ux.intel.com>, irenic.rajneesh@...il.com,
 david.e.box@...el.com, ilpo.jarvinen@...ux.intel.com,
 platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: "David E . Box" <david.e.box@...ux.intel.com>
Subject: Re: [PATCH 1/8] platform/x86/intel/pmc: Fix in mtl_punit_pmt_init()

Hi,

On 12/19/23 05:22, rjingar wrote:
> From: Rajvi Jingar <rajvi.jingar@...ux.intel.com>
> 
> pci_get_domain_bus_and_slot() increases the reference count on the pci
> device that is used to register the endpoint. In case of failure in
> registration, decrease reference count using pci_dev_put(pcidev) before
> returning.
> 
> Fixes: 6e7964855381 ("platform/x86/intel/pmc: Show Die C6 counter on Meteor Lake")
> Signed-off-by: Rajvi Jingar <rajvi.jingar@...ux.intel.com>
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans

> ---
>  drivers/platform/x86/intel/pmc/mtl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/pmc/mtl.c b/drivers/platform/x86/intel/pmc/mtl.c
> index 38c2f946ec23..fb59dffccf28 100644
> --- a/drivers/platform/x86/intel/pmc/mtl.c
> +++ b/drivers/platform/x86/intel/pmc/mtl.c
> @@ -985,6 +985,7 @@ static void mtl_punit_pmt_init(struct pmc_dev *pmcdev)
>  	}
>  
>  	ep = pmt_telem_find_and_register_endpoint(pcidev, MTL_PMT_DMU_GUID, 0);
> +	pci_dev_put(pcidev);
>  	if (IS_ERR(ep)) {
>  		dev_err(&pmcdev->pdev->dev,
>  			"pmc_core: couldn't get DMU telem endpoint, %ld\n",
> @@ -992,7 +993,6 @@ static void mtl_punit_pmt_init(struct pmc_dev *pmcdev)
>  		return;
>  	}
>  
> -	pci_dev_put(pcidev);
>  	pmcdev->punit_ep = ep;
>  
>  	pmcdev->has_die_c6 = true;