From d3862e44daa7a0c94d2f6193502a8c49379acfce Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 29 Jun 2017 22:05:32 +0100 Subject: dma-buf/sw-sync: Fix locking around sync_timeline lists 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 Cc: Sumit Semwal Cc: Sean Paul Cc: Gustavo Padovan Reviewed-by: Sean Paul Signed-off-by: Gustavo Padovan Link: http://patchwork.freedesktop.org/patch/msgid/20170629210532.5617-1-chris@chris-wilson.co.uk --- drivers/dma-buf/sync_debug.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'drivers/dma-buf/sync_debug.c') diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c index 0e91632248ba..2264a075f6a9 100644 --- a/drivers/dma-buf/sync_debug.c +++ b/drivers/dma-buf/sync_debug.c @@ -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, -- cgit v1.2.3