linux-kernel - Re: [PATCH] platform/x86/intel-uncore-freq: Don't present root domain on error

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Date: Mon, 22 Apr 2024 15:25:50 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH] platform/x86/intel-uncore-freq: Don't present root domain
 on error

Hi,

On 4/15/24 11:52 PM, Srinivas Pandruvada wrote:
> If none of the clusters are added because of some error, fail to load
> driver without presenting root domain. In this case root domain will
> present invalid data.
> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Fixes: 01c10f88c9b7 ("platform/x86/intel-uncore-freq: tpmi: Provide cluster level control")
> Cc: <stable@...r.kernel.org> # 6.5+
> ---
> This error can be reproduced in the pre production hardware only.
> So can go through regular cycle and they apply to stable.

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

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

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




> 
>  .../x86/intel/uncore-frequency/uncore-frequency-tpmi.c     | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
> index bd75d61ff8a6..587437211d72 100644
> --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
> +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
> @@ -240,6 +240,7 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
>  	bool read_blocked = 0, write_blocked = 0;
>  	struct intel_tpmi_plat_info *plat_info;
>  	struct tpmi_uncore_struct *tpmi_uncore;
> +	bool uncore_sysfs_added = false;
>  	int ret, i, pkg = 0;
>  	int num_resources;
>  
> @@ -384,9 +385,15 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
>  			}
>  			/* Point to next cluster offset */
>  			cluster_offset >>= UNCORE_MAX_CLUSTER_PER_DOMAIN;
> +			uncore_sysfs_added = true;
>  		}
>  	}
>  
> +	if (!uncore_sysfs_added) {
> +		ret = -ENODEV;
> +		goto remove_clusters;
> +	}
> +
>  	auxiliary_set_drvdata(auxdev, tpmi_uncore);
>  
>  	tpmi_uncore->root_cluster.root_domain = true;