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.d...@hp.com> > To: r...@sisk.pl, bhelg...@google.com > Cc: ying.hu...@intel.com, linux-a...@vger.kernel.org, > linux-kernel@vger.kernel.org, linux-...@vger.kernel.org, Betty Dall > <betty.d...@hp.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.d...@hp.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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