linux-kernel - Re: [PATCH v2] "ACPI: PCC: Fix unintentional integer overflow"

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Date:   Tue, 18 Oct 2022 09:12:52 +0800
From:   "lihuisong (C)" <lihuisong@...wei.com>
To:     Manank Patel <pmanank200502@...il.com>, <rafael@...nel.org>
CC:     <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v2] "ACPI: PCC: Fix unintentional integer overflow"


在 2022/10/18 2:43, Manank Patel 写道:
> Fixed unintentional u32 overflow by changing PCC_CMD_WAIT_RETRIES_NUM to 500ULL
>
> Fixes: 91cefefb6991 ("ACPI: PCC: replace wait_for_completion()")
>
> Signed-off-by: Manank Patel <pmanank200502@...il.com>
> Acked-by: Sudeep Holla <sudeep.holla@....com>
>
> ---
> Thank you so much @sudeep for your clarifications!
>
> Changelog:
> v1->v2:
>          Change the macro itself to ULL instead of typecasting in the
>          code
>
>   drivers/acpi/acpi_pcc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/acpi_pcc.c b/drivers/acpi/acpi_pcc.c
> index ee4ce5ba1fb2..3e252be047b8 100644
> --- a/drivers/acpi/acpi_pcc.c
> +++ b/drivers/acpi/acpi_pcc.c
> @@ -27,7 +27,7 @@
>    * Arbitrary retries in case the remote processor is slow to respond
>    * to PCC commands
>    */
> -#define PCC_CMD_WAIT_RETRIES_NUM	500
> +#define PCC_CMD_WAIT_RETRIES_NUM	500ULL
>   
>   struct pcc_data {
>   	struct pcc_mbox_chan *pcc_chan;

Acked-by: Huisong Li <lihuisong@...wei.com>