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Code Issues Releases Wiki Activity

vfio/ccw: remove release completion

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There's enough separation between the parent and private structs now,
that it is fine to remove the release completion hack.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20221104142007.1314999-6-farman@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Farman 2022-11-04 15:20:05 +01:00 committed by Alex Williamson
parent 3d62fe18b6
commit f4da83f7e3
2 changed files with 1 additions and 16 deletions
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14
drivers/s390/cio/vfio_ccw_ops.c
View file

@ -54,7 +54,6 @@ static int vfio_ccw_mdev_init_dev(struct vfio_device *vdev)
INIT_LIST_HEAD(&private->crw);
INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
init_completion(&private->release_comp);
private->cp.guest_cp = kcalloc(CCWCHAIN_LEN_MAX, sizeof(struct ccw1),
GFP_KERNEL);
@ -137,7 +136,7 @@ static void vfio_ccw_mdev_release_dev(struct vfio_device *vdev)
struct vfio_ccw_private *private =
container_of(vdev, struct vfio_ccw_private, vdev);
complete(&private->release_comp);
vfio_ccw_free_private(private);
}
static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
@ -155,17 +154,6 @@ static void vfio_ccw_mdev_remove(struct mdev_device *mdev)
dev_set_drvdata(&parent->dev, NULL);
vfio_put_device(&private->vdev);
/*
* Wait for all active references on mdev are released so it
* is safe to defer kfree() to a later point.
*
* TODO: the clean fix is to split parent/mdev info from ccw
* private structure so each can be managed in its own life
* cycle.
*/
wait_for_completion(&private->release_comp);
vfio_ccw_free_private(private);
}
static int vfio_ccw_mdev_open_device(struct vfio_device *vdev)

3
drivers/s390/cio/vfio_ccw_private.h
View file

@ -102,7 +102,6 @@ struct vfio_ccw_parent {
* @req_trigger: eventfd ctx for signaling userspace to return device
* @io_work: work for deferral process of I/O handling
* @crw_work: work for deferral process of CRW handling
* @release_comp: synchronization helper for vfio device release
*/
struct vfio_ccw_private {
struct vfio_device vdev;
@ -126,8 +125,6 @@ struct vfio_ccw_private {
struct eventfd_ctx *req_trigger;
struct work_struct io_work;
struct work_struct crw_work;
struct completion release_comp;
} __aligned(8);
int vfio_ccw_sch_quiesce(struct subchannel *sch);