linux-kernel - Re: [PATCH 1/1] tools: iio: fix iio_generic

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Message-ID: <ZZrZp4VNdmBzA4lR@sunspire>
Date: Sun, 7 Jan 2024 19:04:39 +0200
From: Petre Rodan <petre.rodan@...dimension.ro>
To: Jonathan Cameron <jic23@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH 1/1] tools: iio: fix iio_generic_buffer


Hi Jonathan,

On Sun, Jan 07, 2024 at 05:00:26PM +0000, Jonathan Cameron wrote:
> > On Sun, Jan 07, 2024 at 03:53:33PM +0000, Jonathan Cameron wrote:
> > > On Thu,  4 Jan 2024 12:12:45 +0200
> > > Petre Rodan <petre.rodan@...dimension.ro> wrote:
> > >   
> > > > Fix code flow problem and floating point exception caused by improper
> > > > directory stream positioning.
> > > > 
> > > > Fixes: <e58537ccce733> ("staging: iio: update example application.")
> > > > Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>  
> > > Hi Petre,
> > > 
> > > This doesn't really explain 'why' seeekdir(dp, 0) is wrong.
> > > My assumption is that telldir() would not have returned 0 on this particular
> > > system?  Could you confirm that and update the message to explain why
> > > seekdir(dp, 0) is not equivalent to rewinddir(dp).  
> > 
> > it looks like there is a 32-bit specific bug in one of the glibc patches that
> > the stable Gentoo Linux is using [1]. telldir returns (u32)(-1) if seekdir is
> > used which ends up in a floating point exception.
> > 
> > it so happens that the rewinddir() function (which is equivalent) works
> > correctly. so it is a fix for Gentoo users and should not impact anyone else.
> > 
> > [1] https://sourceware.org/bugzilla/show_bug.cgi?id=31212
> > 
> > my very best regards,
> > peter
> 
> I'd be happy to take the same change as a cleanup if you want to resubmit it
> with a different patch description.

sure, I will resubmit it, but tomorrow morning.

best regards,
peter

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