linux-kernel - Re: [PATCH 2/2] selftests: watchdog: Add command line option to show watchdog

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Date:   Mon, 16 Sep 2019 12:15:41 -0400
From:   "George G. Davis" <george_davis@...tor.com>
To:     shuah <shuah@...nel.org>
CC:     Eugeniu Rosca <erosca@...adit-jv.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        Jerry Hoemann <jerry.hoemann@....com>,
        Colin Ian King <colin.king@...onical.com>,
        <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] selftests: watchdog: Add command line option to show
 watchdog_info

Hello Shuah,

On Mon, Sep 16, 2019 at 10:05:17AM -0600, shuah wrote:
> On 9/16/19 7:57 AM, Eugeniu Rosca wrote:
> >Hi Shuah,
> >CC George
> >
> >On Mon, Sep 16, 2019 at 07:26:41AM -0600, shuah wrote:
> >[..]
> >>>   		case 'f':
> >>>   			/* Handled above */
> >>>   			break;
> >>>+		case 'i':
> >>>+			/*
> >>>+			 * watchdog_info was obtained as part of file open
> >>>+			 * validation. So we just show it here.
> >>>+			 */
> >>>+			oneshot = 1;
> >>>+			printf("watchdog_info:\n");
> >>>+			printf(" identity:\t\t%s\n", info.identity);
> >>>+			printf(" firmware_version:\t%u\n",
> >>>+			       info.firmware_version);
> >>>+			printf(" options:\t\t%08x\n", info.options);
> >>>+			break;
> >>>   		default:
> >>>   			usage(argv[0]);
> >>>
> >>
> >>I would like to see these combined. Please don't add another argument.
> >>Combine patch and 1&2.
> >
> >With all my appreciation for your comment, why do you think it is better
> >to get rid of the new argument? I don't think it is user-friendly to
> >always report the watchdog_info to the user. Just look at outputs [1-2]
> >and imagine that the watchdog_info part would pop up unconditionally.
> >It looks too busy to me.
> 
> Yes it does look busy. I am okay with adding a second options
> based on what you both said.
> 
> I don't like the commit log.

Agreed, I didn't like it either - it was rather a draft.

> 
> Unfortunately this thread no longer contains the commit log.
> 
> I would like to see the commit log without any references to side
> effects. It make it rather confusing.
> 
> "A side of affect of commit "selftests: watchdog: Add optional file
> argument" is that arbitrary files may be opened for watchdog testing, e.g.
> /dev/null. To prevent watchdog-test from operating on non-watchdog device
> files, commit "selftests: watchdog: Validate optional file argument" was
> added to validate that a file is indeed a watchdog device via an
> ioctl(WDIOC_GETSUPPORT) call. Since the watchdog_info is available as a
> result of the ioctl(WDIOC_GETSUPPORT) call, add a command line option to
> show the watchdog_info."
> 
> I would drop all references to that.

How about the following commit message for the squash commit for [1] and [2]?:

"
selftests: watchdog: Validate optional file argument

As reported by Eugeniu Rosca, a side of affect of commit c3f2490d6e92
("selftests: watchdog: Add optional file argument") is that arbitrary files
may be opened for watchdog testing, e.g.

./watchdog-test  -f /dev/zero
Watchdog Ticking Away!

To prevent watchdog-test from operating on non-watchdog device files,
validate that a file is indeed a watchdog device via an
ioctl(WDIOC_GETSUPPORT) call.

While we're at it, since the watchdog_info is available as a result of the
ioctl(WDIOC_GETSUPPORT) call, add a command line option to optionally show
the watchdog_info.
"

Thanks!


> 
> thanks,
> -- Shuah

-- 
Regards,
George