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xen/blkback: simplify free_persistent_gnts() interface

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The interface of free_persistent_gnts() can be simplified, as there is
only a single caller of free_persistent_gnts() and the 2nd and 3rd
parameters are easily obtainable via the ring pointer, which is passed
as the first parameter anyway.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-12-12 10:37:42 +01:00
parent 656f3c1d79
commit e7b4c07d4b
1 changed files with 10 additions and 10 deletions
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20
drivers/block/xen-blkback/blkback.c
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@ -239,9 +239,9 @@ static void put_persistent_gnt(struct xen_blkif_ring *ring,
atomic_dec(&ring->persistent_gnt_in_use);
}
static void free_persistent_gnts(struct xen_blkif_ring *ring, struct rb_root *root,
unsigned int num)
static void free_persistent_gnts(struct xen_blkif_ring *ring)
{
struct rb_root *root = &ring->persistent_gnts;
struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct persistent_gnt *persistent_gnt;
@ -249,6 +249,9 @@ static void free_persistent_gnts(struct xen_blkif_ring *ring, struct rb_root *ro
int segs_to_unmap = 0;
struct gntab_unmap_queue_data unmap_data;
if (RB_EMPTY_ROOT(root))
return;
unmap_data.pages = pages;
unmap_data.unmap_ops = unmap;
unmap_data.kunmap_ops = NULL;
@ -277,9 +280,11 @@ static void free_persistent_gnts(struct xen_blkif_ring *ring, struct rb_root *ro
rb_erase(&persistent_gnt->node, root);
kfree(persistent_gnt);
num--;
ring->persistent_gnt_c--;
}
BUG_ON(num != 0);
BUG_ON(!RB_EMPTY_ROOT(&ring->persistent_gnts));
BUG_ON(ring->persistent_gnt_c != 0);
}
void xen_blkbk_unmap_purged_grants(struct work_struct *work)
@ -631,12 +636,7 @@ int xen_blkif_schedule(void *arg)
void xen_blkbk_free_caches(struct xen_blkif_ring *ring)
{
/* Free all persistent grant pages */
if (!RB_EMPTY_ROOT(&ring->persistent_gnts))
free_persistent_gnts(ring, &ring->persistent_gnts,
ring->persistent_gnt_c);
BUG_ON(!RB_EMPTY_ROOT(&ring->persistent_gnts));
ring->persistent_gnt_c = 0;
free_persistent_gnts(ring);
/* Since we are shutting down remove all pages from the buffer */
gnttab_page_cache_shrink(&ring->free_pages, 0 /* All */);