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From: Kent Gibson <warthog618@gmail.com>
To: brgl@bgdev.pl
Cc: linux-gpio@vger.kernel.org
Subject: Re: [BUG] gpiolib: cdev: can't read RELEASED event for last line
Date: Thu, 25 May 2023 15:46:12 +0800	[thread overview]
Message-ID: <ZG8SRE9QzBYRspCO@sol> (raw)
In-Reply-To: <ZG8Jpjq/N97plOGe@sol>

On Thu, May 25, 2023 at 03:09:26PM +0800, Kent Gibson wrote:
> On Thu, May 25, 2023 at 11:09:52AM +0800, Kent Gibson wrote:
> > Hi Bart,
> > 
> I can also confirm that receiving the event using a blocking read() on the
> fd still works, it is a poll() on the fd followed by a read() that fails.
> 

Hmmm, so it occurred to me that gpionotify does the poll()/read(), so it
should exhibit the bug.  But no, it doesn't.

So it could be my code doing something boneheaded??
Or there is some other variable at play.
I'll try to write a test for it with libgpiod and see I can reproduce
it.  But I might put it on the back burner - this one isn't terribly
high priority.

Cheers,
Kent.


  reply	other threads:[~2023-05-25  7:46 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-25  3:09 [BUG] gpiolib: cdev: can't read RELEASED event for last line Kent Gibson
2023-05-25  7:09 ` Kent Gibson
2023-05-25  7:46   ` Kent Gibson [this message]
2023-05-25 13:21     ` Kent Gibson
2023-05-26  0:45       ` Kent Gibson
2023-05-26  6:51         ` Kent Gibson

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