On Mon, 25 Jul 2016, Jens Axboe wrote:

quoted

From: Jiri Kosina <redacted>

Commit 09954bad4 ("floppy: refactor open() flags handling"), as a
side-effect, causes open(/dev/fdX, O_ACCMODE) to fail. It turns out that
this is being used setfdprm userspace for ioctl-only open().

Reintroduce back the original behavior wrt !(FMODE_READ|FMODE_WRITE)
modes, while still keeping the original O_NDELAY bug fixed.

Cc: stable@vger.kernel.org # v4.5+
Reported-by: Wim Osterholt <redacted>
Tested-by: Wim Osterholt <redacted>
Signed-off-by: Jiri Kosina <redacted>

Added for this series, thanks.

[ CCing Denis too ]

Let me revive this 4 years old thread.

I've just now noticed that instead of my patch above being merged, what 
happened instead was

	commit f2791e7eadf437633f30faa51b30878cf15650be
	Author: Jens Axboe [off-list ref]
	Date:   Thu Aug 25 08:56:51 2016 -0600

	    Revert "floppy: refactor open() flags handling"
    
	    This reverts commit 09954bad448791ef01202351d437abdd9497a804.


which was plain revert of 09954bad4 (without any further explanation), 
which in turn reintroduced the O_NDELAY issue, and I've just been hit by 
it again.

I am not able to find any e-mail thread that'd indicate why ultimately 
revert happened, instead of mergin my fix.
Jens, do you have any idea?

Thanks,

-- 
Jiri Kosina
SUSE Labs