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dma-buf: fix inconsistent debug print v2 

Drop the whole rcu handling since we are holding the resv lock anyway.

v2: drop all rcu handling instead.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210602140359.272601-1-christian.koenig@amd.com
This commit is contained in:
Christian König 2021-05-06 15:00:31 +02:00
parent 610d9c311b
commit 680753dd9d
1 changed files with 9 additions and 18 deletions
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27
drivers/dma-buf/dma-buf.c
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@ -1349,15 +1349,14 @@ EXPORT_SYMBOL_GPL(dma_buf_vunmap);
#ifdef CONFIG_DEBUG_FS
static int dma_buf_debug_show(struct seq_file *s, void *unused)
{
int ret;
struct dma_buf *buf_obj;
struct dma_buf_attachment *attach_obj;
struct dma_resv *robj;
struct dma_resv_list *fobj;
struct dma_fence *fence;
unsigned seq;
int count = 0, attach_count, shared_count, i;
size_t size = 0;
int ret;
ret = mutex_lock_interruptible(&db_list.lock);
@ -1383,33 +1382,25 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
buf_obj->name ?: "");
robj = buf_obj->resv;
while (true) {
seq = read_seqcount_begin(&robj->seq);
rcu_read_lock();
fobj = rcu_dereference(robj->fence);
shared_count = fobj ? fobj->shared_count : 0;
fence = rcu_dereference(robj->fence_excl);
if (!read_seqcount_retry(&robj->seq, seq))
break;
rcu_read_unlock();
}
fence = rcu_dereference_protected(robj->fence_excl,
dma_resv_held(robj));
if (fence)
seq_printf(s, "\tExclusive fence: %s %s %ssignalled\n",
fence->ops->get_driver_name(fence),
fence->ops->get_timeline_name(fence),
dma_fence_is_signaled(fence) ? "" : "un");
fobj = rcu_dereference_protected(robj->fence,
dma_resv_held(robj));
shared_count = fobj ? fobj->shared_count : 0;
for (i = 0; i < shared_count; i++) {
fence = rcu_dereference(fobj->shared[i]);
if (!dma_fence_get_rcu(fence))
continue;
fence = rcu_dereference_protected(fobj->shared[i],
dma_resv_held(robj));
seq_printf(s, "\tShared fence: %s %s %ssignalled\n",
fence->ops->get_driver_name(fence),
fence->ops->get_timeline_name(fence),
dma_fence_is_signaled(fence) ? "" : "un");
dma_fence_put(fence);
}
rcu_read_unlock();
seq_puts(s, "\tAttached Devices:\n");
attach_count = 0;