On Sun, 8 Aug 2021, Denis Efremov wrote:
The patch breaks userspace implementations (e.g. fdutils) and introduces regressions in behaviour. Previously, it was possible to O_NDELAY open a floppy device with no media inserted or with write protected media without an error. Some userspace tools use this particular behavior for probing.
It's not the first time when we revert this patch. Previous revert is in commit f2791e7eadf4 (Revert "floppy: refactor open() flags handling").
This reverts commit 8a0c014cd20516ade9654fc13b51345ec58e7be8.
By reverting it you bring back the bugs that were fixed by it -- e.g. the possibility to livelock mmap() on the returned fd to keep waiting on the page unlock bit forever, or the functionality bug reported at [1], and likely others.
[1] https://bugzilla.suse.com/show_bug.cgi?id=1181018