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From: Dipen Patel <dipenp@nvidia.com>
To: Kent Gibson <warthog618@gmail.com>
Cc: <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
	<linux-kernel@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
	<linux-gpio@vger.kernel.org>, <linus.walleij@linaro.org>,
	<bgolaszewski@baylibre.com>, <devicetree@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <robh+dt@kernel.org>,
	<andriy.shevchenko@linux.intel.com>
Subject: Re: [RFC 08/11] gpiolib: cdev: Add hardware timestamp clock type
Date: Tue, 3 Aug 2021 15:41:56 -0700	[thread overview]
Message-ID: <1102e1b2-9d53-fc93-b7c5-bfeb9eb2e18d@nvidia.com> (raw)
In-Reply-To: <20210731060556.GA11043@sol>


On 7/30/21 11:05 PM, Kent Gibson wrote:
> On Thu, Jul 29, 2021 at 08:07:15PM -0700, Dipen Patel wrote:
>> On 7/1/21 7:24 AM, Kent Gibson wrote:
> <snip>
>>>>  			ret = gpiod_direction_output(desc, val);
>>>>  			if (ret)
>>>>  				return ret;
>>>> @@ -1152,6 +1186,13 @@ static long linereq_set_config_unlocked(struct linereq *lr,
>>>>  					polarity_change);
>>>>  			if (ret)
>>>>  				return ret;
>>>> +
>>>> +			/* Check if new config sets hardware assisted clock */
>>>> +			if (flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HARDWARE) {
>>>> +				ret = gpiod_hw_timestamp_control(desc, true);
>>>> +				if (ret)
>>>> +					return ret;
>>>> +			}
>>>>  		}
>>>>  
>>> The error code here can come from the pinctrl timestamp_control(), so it
>>> should be sanitised before being returned to userspace.
>> I do not understand what do you mean by sanitise. I just followed what
>>
>> gpiod_direction_output did just above which also returns ret from gpio
>>
>> driver code similar to timestamp_control API.
>>
> In this context, sanitise means convert any kernel internal error codes
> to their userspace equivalent before returning them to userspace.
>
> Fair enough with the gpiod_direction_output() comparison.  I was thinking
> of a patch Andy recently submitted[1] to sanitise gpiod_request(), which
> can sometimes return EPROBE_DEFER.  But I guess we can wait until we find
> a case of a driver returning an internal error code and add a sanitiser
> then.
Make sense, I will add sanity check
>
> Cheers,
> Kent.
>
> [1] https://www.spinics.net/lists/linux-gpio/msg60998.html
>

  reply	other threads:[~2021-08-03 22:32 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-25 23:55 [RFC 00/11] Intro to Hardware timestamping engine Dipen Patel
2021-06-25 23:55 ` [RFC 01/11] Documentation: Add HTE subsystem guide Dipen Patel
2021-07-04 18:55   ` Jonathan Cameron
2021-07-27 23:44     ` Dipen Patel
2021-08-01 15:24       ` Jonathan Cameron
2021-06-25 23:55 ` [RFC 02/11] drivers: Add HTE subsystem Dipen Patel
2021-06-27 17:40   ` Randy Dunlap
2021-07-04 20:15   ` Jonathan Cameron
2021-07-04 20:45     ` Jonathan Cameron
2021-07-28  5:12       ` Dipen Patel
2021-08-01 16:48         ` Jonathan Cameron
2021-07-28  4:38     ` Dipen Patel
2021-08-01 16:13       ` Jonathan Cameron
2021-09-14  5:43         ` Dipen Patel
2021-09-26 15:42           ` Jonathan Cameron
2021-07-05  7:30   ` Greg KH
2021-07-28  0:34     ` Dipen Patel
2021-06-25 23:55 ` [RFC 03/11] hte: Add tegra194 HTE kernel provider Dipen Patel
2021-07-01 14:21   ` Kent Gibson
2021-07-28 23:59     ` Dipen Patel
2021-07-30  7:01       ` Dipen Patel
2021-07-31 15:43       ` Kent Gibson
2021-08-03 22:40         ` Dipen Patel
2021-08-03 23:02           ` Kent Gibson
2021-08-07  2:41         ` Dipen Patel
2021-08-07  3:07           ` Kent Gibson
2021-08-07  4:52             ` Dipen Patel
2021-08-07  4:51               ` Kent Gibson
2021-08-07  5:35                 ` Dipen Patel
2021-08-07  5:42                   ` Kent Gibson
2021-08-07  5:47                   ` Dipen Patel
2021-07-04 20:27   ` Jonathan Cameron
2021-07-29  2:42     ` Dipen Patel
2021-07-08 23:33   ` Michał Mirosław
2021-07-29  2:43     ` Dipen Patel
2021-06-25 23:55 ` [RFC 04/11] dt-bindings: Add HTE bindings Dipen Patel
2021-06-27 10:56   ` Linus Walleij
2021-07-30  1:32     ` Dipen Patel
2021-07-01 14:02   ` Rob Herring
2021-07-30  1:56     ` Dipen Patel
2021-07-01 15:54   ` Rob Herring
2021-07-30  1:58     ` Dipen Patel
2021-06-25 23:55 ` [RFC 05/11] hte: Add Tegra194 IRQ HTE test driver Dipen Patel
2021-06-27 17:42   ` Randy Dunlap
2021-06-25 23:55 ` [RFC 06/11] gpiolib: Add HTE support Dipen Patel
2021-06-27 11:41   ` Linus Walleij
2021-07-01 14:24   ` Kent Gibson
2021-07-30  2:25     ` Dipen Patel
2021-07-31  5:13       ` Kent Gibson
2021-06-25 23:55 ` [RFC 07/11] gpio: tegra186: Add HTE in gpio-tegra186 driver Dipen Patel
2021-06-25 23:55 ` [RFC 08/11] gpiolib: cdev: Add hardware timestamp clock type Dipen Patel
2021-06-27 11:38   ` Linus Walleij
2021-06-27 11:49   ` Linus Walleij
2021-07-30  3:16     ` Dipen Patel
2021-07-01 14:24   ` Kent Gibson
2021-07-30  3:07     ` Dipen Patel
2021-07-31  6:05       ` Kent Gibson
2021-08-03 22:41         ` Dipen Patel [this message]
2021-08-03 22:38           ` Kent Gibson
2021-07-09  8:30   ` Jon Hunter
2021-07-30  2:33     ` Dipen Patel
2021-08-03 16:42       ` Jon Hunter
2021-08-03 22:51         ` Dipen Patel
2021-08-03 23:09           ` Kent Gibson
2021-06-25 23:55 ` [RFC 09/11] tools: gpio: Add new hardware " Dipen Patel
2021-06-27 11:36   ` Linus Walleij
2021-07-30  3:17     ` Dipen Patel
2021-07-31  6:16       ` Kent Gibson
2021-08-11  9:11         ` Linus Walleij
2021-06-25 23:55 ` [RFC 10/11] hte: Add tegra GPIO HTE test driver Dipen Patel
2021-06-27 17:43   ` Randy Dunlap
2021-06-25 23:55 ` [RFC 11/11] MAINTAINERS: Added HTE Subsystem Dipen Patel
2021-06-27 13:07 ` [RFC 00/11] Intro to Hardware timestamping engine Andy Shevchenko
2021-06-27 14:40   ` Linus Walleij
2021-06-28 12:02     ` Andy Shevchenko

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