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dma-buf/sw-sync: Fix locking around sync_timeline lists

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The sync_pt were not adding themselves atomically to the timeline lists,
corruption imminent.  Only a single list is required to track the
unsignaled sync_pt, so reduce it and rename the lock more appropriately
along with using idiomatic names to distinguish a list from links along
it.

v2: Prevent spinlock recursion on free during create (next patch) and
fixup crossref in kerneldoc

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629210532.5617-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-06-29 22:05:32 +01:00 • committed by Gustavo Padovan
parent 3b52ce44e7
commit d3862e44da
3 changed files with 31 additions and 47 deletions
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9
drivers/dma-buf/sync_debug.c
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@ -119,13 +119,12 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
seq_printf(s, "%s: %d\n", obj->name, obj->value);
spin_lock_irq(&obj->child_list_lock);
list_for_each(pos, &obj->child_list_head) {
struct sync_pt *pt =
container_of(pos, struct sync_pt, child_list);
spin_lock_irq(&obj->lock);
list_for_each(pos, &obj->pt_list) {
struct sync_pt *pt = container_of(pos, struct sync_pt, link);
sync_print_fence(s, &pt->base, false);
}
spin_unlock_irq(&obj->child_list_lock);
spin_unlock_irq(&obj->lock);
}
static void sync_print_sync_file(struct seq_file *s,