linux-kernel - Re: [PATCH v2 1/3] PCI/AER: Fix incorrect return from aer_hest

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Message-ID: <20130604074159.GB20448@gchen.bj.intel.com>
Date:	Tue, 4 Jun 2013 03:42:00 -0400
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	Betty Dall <betty.dall@...com>
Cc:	rjw@...k.pl, bhelgaas@...gle.com, ying.huang@...el.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 1/3] PCI/AER: Fix incorrect return from
 aer_hest_parse()

On Thu, May 30, 2013 at 08:39:27AM -0600, Betty Dall wrote:
> Date:	Thu, 30 May 2013 08:39:27 -0600
> From: Betty Dall <betty.dall@...com>
> To: rjw@...k.pl, bhelgaas@...gle.com
> Cc: ying.huang@...el.com, linux-acpi@...r.kernel.org,
>  linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, Betty Dall
>  <betty.dall@...com>
> Subject: [PATCH v2 1/3] PCI/AER: Fix incorrect return from aer_hest_parse()
> X-Mailer: git-send-email 1.7.7.6
> 
> The function aer_hest_parse() is called to determine if the given
> PCI device is firmware first or not. The code loops through each
> section of the HEST table to look for a match. The bug is that
> the function always returns whether the last HEST section is firmware
> first. The fix stops the iteration once the info.firmware_first
> variable is set.  This is similar to how the function aer_hest_parse_aff()
> stops the iteration.
> 
> Signed-off-by: Betty Dall <betty.dall@...com>

The patch is good. But I have further concern based on your patch.
1) aer_hest_parse never checks the 2nd input parameter (void *data),
which means once it is NULL, it will crash the kernel.

2) both aer_hest_parse and aer_hest_parse_aff utilize some flag
as shortcut, if so, why not adding similar logic in apei_hest_parse
to stop meaningless loops once FFM is confirmed as enabled.

> ---
> 
>  drivers/pci/pcie/aer/aerdrv_acpi.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> 
> diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
> index 5194a7d..39b8671 100644
> --- a/drivers/pci/pcie/aer/aerdrv_acpi.c
> +++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
> @@ -42,6 +42,9 @@ static int aer_hest_parse(struct acpi_hest_header *hest_hdr, void *data)
>  	u8 bridge = 0;
>  	int ff = 0;
>  
> +	if (info->firmware_first)
> +		return 0;
> +
>  	switch (hest_hdr->type) {
>  	case ACPI_HEST_TYPE_AER_ROOT_PORT:
>  		pcie_type = PCI_EXP_TYPE_ROOT_PORT;
> --
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