linux-kernel - Re: [PATCH v6 07/16] PCI/AER: Initialize aer_err

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Message-ID: <ef2fec8c-2efa-44be-add7-480344d1c446@linux.intel.com>
Date: Mon, 19 May 2025 16:50:09 -0700
From: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org
Cc: Jon Pan-Doh <pandoh@...gle.com>,
 Karolina Stolarek <karolina.stolarek@...cle.com>,
 Martin Petersen <martin.petersen@...cle.com>,
 Ben Fuller <ben.fuller@...cle.com>, Drew Walton <drewwalton@...rosoft.com>,
 Anil Agrawal <anilagrawal@...a.com>, Tony Luck <tony.luck@...el.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Lukas Wunner <lukas@...ner.de>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Sargun Dhillon <sargun@...a.com>, "Paul E . McKenney" <paulmck@...nel.org>,
 Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
 Oliver O'Halloran <oohall@...il.com>, Kai-Heng Feng <kaihengf@...dia.com>,
 Keith Busch <kbusch@...nel.org>, Robert Richter <rrichter@....com>,
 Terry Bowman <terry.bowman@....com>, Shiju Jose <shiju.jose@...wei.com>,
 Dave Jiang <dave.jiang@...el.com>, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v6 07/16] PCI/AER: Initialize aer_err_info before using it


On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Previously the struct aer_err_info "e_info" was allocated on the stack
> without being initialized, so it contained junk except for the fields we
> explicitly set later.
>
> Initialize "e_info" at declaration with a designated initializer list,
> which initializes the other members to zero.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

>   drivers/pci/pcie/aer.c | 37 ++++++++++++++++---------------------
>   1 file changed, 16 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 95a4cab1d517..40f003eca1c5 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -1281,7 +1281,7 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
>   		struct aer_err_source *e_src)
>   {
>   	struct pci_dev *pdev = rpc->rpd;
> -	struct aer_err_info e_info;
> +	u32 status = e_src->status;
>   
>   	pci_rootport_aer_stats_incr(pdev, e_src);
>   
> @@ -1289,14 +1289,13 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
>   	 * There is a possibility that both correctable error and
>   	 * uncorrectable error being logged. Report correctable error first.
>   	 */
> -	if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
> -		e_info.id = ERR_COR_ID(e_src->id);
> -		e_info.severity = AER_CORRECTABLE;
> -
> -		if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
> -			e_info.multi_error_valid = 1;
> -		else
> -			e_info.multi_error_valid = 0;
> +	if (status & PCI_ERR_ROOT_COR_RCV) {
> +		int multi = status & PCI_ERR_ROOT_MULTI_COR_RCV;
> +		struct aer_err_info e_info = {
> +			.id = ERR_COR_ID(e_src->id),
> +			.severity = AER_CORRECTABLE,
> +			.multi_error_valid = multi ? 1 : 0,
> +		};
>   
>   		if (find_source_device(pdev, &e_info)) {
>   			aer_print_source(pdev, &e_info, "");
> @@ -1304,18 +1303,14 @@ static void aer_isr_one_error(struct aer_rpc *rpc,
>   		}
>   	}
>   
> -	if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
> -		e_info.id = ERR_UNCOR_ID(e_src->id);
> -
> -		if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
> -			e_info.severity = AER_FATAL;
> -		else
> -			e_info.severity = AER_NONFATAL;
> -
> -		if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
> -			e_info.multi_error_valid = 1;
> -		else
> -			e_info.multi_error_valid = 0;
> +	if (status & PCI_ERR_ROOT_UNCOR_RCV) {
> +		int fatal = status & PCI_ERR_ROOT_FATAL_RCV;
> +		int multi = status & PCI_ERR_ROOT_MULTI_UNCOR_RCV;
> +		struct aer_err_info e_info = {
> +			.id = ERR_UNCOR_ID(e_src->id),
> +			.severity = fatal ? AER_FATAL : AER_NONFATAL,
> +			.multi_error_valid = multi ? 1 : 0,
> +		};
>   
>   		if (find_source_device(pdev, &e_info)) {
>   			aer_print_source(pdev, &e_info, "");

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer