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Jason Gunthorpe
9c799c224d
Many of the mdev drivers use a simple counter for keeping track of the available instances. Move this code to the core code and store the counter in the mdev_parent. Implement it using correct locking, fixing mdpy. Drivers just provide the value in the mdev_driver at registration time and the core code takes care of maintaining it and exposing the value in sysfs. [hch: count instances per-parent instead of per-type, use an atomic_t to avoid taking mdev_list_lock in the show method] Signed-off-by: Jason Gunthorpe <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Kevin Tian <[email protected]> Reviewed-by: Kirti Wankhede <[email protected]> Reviewed-by: Eric Farman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alex Williamson <[email protected]>