On 8/17/26 9:53 AM, John Garry wrote:
From: John Garry <[email protected]>
Back in the 2.6.xx days, it was possible to for low-level drivers to set
the shost lock pointer. That is why there is a default lock and a pointer
to the shost lock.
However, support for this has long been removed, so drop
Scsi_Host.default_lock and make Scsi_Host.host_lock as the actual lock.
Getting the address of embedded host_lock structure just requires adding
a fixed offset value to the shost pointer. However, getting the value of
the host_lock pointer requires loading from a fixed offset to the shost
pointer. The latter should be very slightly slower, which is relevant as
this lock is used a lot throughout the core code and drivers.
Signed-off-by: John Garry <[email protected]>
Acked-by: Damien Le Moal <[email protected]> # ata parts
Reviewed-by: Bart Van Assche <[email protected]>
---
Difference to v3:
- Rebase and update some annotations
Differences to v2:
- Add tags from Bart and Damien (Thanks!)
- Update Documentation reference to default_lock (Bart)
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
[email protected] +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
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