linux-kernel - Re: [RESEND v13 07/25] CXL/AER: Replace device_lock() in cxl_rch_handle_error

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Message-ID: <20251104180557.00002d24@huawei.com>
Date: Tue, 4 Nov 2025 18:05:57 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Terry Bowman <terry.bowman@....com>
CC: <dave@...olabs.net>, <dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <alucerop@....com>, <ira.weiny@...el.com>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [RESEND v13 07/25] CXL/AER: Replace device_lock() in
 cxl_rch_handle_error_iter() with guard() lock

On Tue, 4 Nov 2025 11:02:47 -0600
Terry Bowman <terry.bowman@....com> wrote:

> cxl_rch_handle_error_iter() includes a call to device_lock() using a goto
> for multiple return paths. Improve readability and maintainability by
> using the guard() lock variant.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>
I don't think there is any existing use of cleanup.h in here aer.c?
If not you should add

#include <linux/cleanup.h> in appropriate place. 

Other than that LGTM

Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>



> 
> ---
> 
> Changes in v12->v13:
> - New patch
> ---
>  drivers/pci/pcie/aer.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 0b5ed4722ac3..cbaed65577d9 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -1187,12 +1187,11 @@ static int cxl_rch_handle_error_iter(struct pci_dev *dev, void *data)
>  	if (!is_cxl_mem_dev(dev) || !cxl_error_is_native(dev))
>  		return 0;
>  
> -	/* Protect dev->driver */
> -	device_lock(&dev->dev);
> +	guard(device)(&dev->dev);
>  
>  	err_handler = dev->driver ? dev->driver->err_handler : NULL;
>  	if (!err_handler)
> -		goto out;
> +		return 0;
>  
>  	if (info->severity == AER_CORRECTABLE) {
>  		if (err_handler->cor_error_detected)
> @@ -1203,8 +1202,6 @@ static int cxl_rch_handle_error_iter(struct pci_dev *dev, void *data)
>  		else if (info->severity == AER_FATAL)
>  			err_handler->error_detected(dev, pci_channel_io_frozen);
>  	}
> -out:
> -	device_unlock(&dev->dev);
>  	return 0;
>  }
>