On 1/18/19 10:32 PM, Martin Wilck wrote:
Drivers now report to the block layer if they support media change
events. If this is not the case, there's no need to allocate
the event structure, and all event handling code can effectively
be skipped. This simplifies code flow in particular for
non-removable sd devices.
This effectively reverts commit 75e3f3ee3c64 ("block: always allocate
genhd->ev if check_events is implemented").
The sysfs files for the events are kept in place even if no events
are supported, as user space may rely on them being present. The only
difference is that an error code is now returned if the user tries
to set poll_msecs.
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
block/genhd.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
