linux-kernel - Re: [PATCH] usb: xhci: tegra: use time64

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Date:   Fri, 20 Oct 2017 13:37:18 +0300
From:   Mathias Nyman <mathias.nyman@...el.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: xhci: tegra: use time64_t for printing timestamp

On 20.10.2017 10:19, Arnd Bergmann wrote:
> The time_t type and time_to_tm() function are deprecated because
> of y2038 problems. In this driver, they are used to pretty-print
> the timestamp of the firmware build. This is fine as long as
> we don't get a firmware build past 2038.
>
> Converting to time64_t and time64_to_tm() avoids the deprecated
> interfaces and works until 2106, when the firmware-defined
> data structure overflows.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/usb/host/xhci-tegra.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index 74436f8ca538..39b6e93130d3 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -771,7 +771,7 @@ static int tegra_xusb_load_firmware(struct tegra_xusb *tegra)
>   	struct device *dev = tegra->dev;
>   	const struct firmware *fw;
>   	unsigned long timeout;
> -	time_t timestamp;
> +	time64_t timestamp;
>   	struct tm time;
>   	u64 address;
>   	u32 value;
> @@ -877,7 +877,7 @@ static int tegra_xusb_load_firmware(struct tegra_xusb *tegra)
>   	}
>
>   	timestamp = le32_to_cpu(header->fwimg_created_time);
> -	time_to_tm(timestamp, 0, &time);
> +	time64_to_tm(timestamp, 0, &time);
>
>   	dev_info(dev, "Firmware timestamp: %ld-%02d-%02d %02d:%02d:%02d UTC\n",
>   		 time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
>

Thanks, adding to queue

-Mathias