The attachment list is now protected by the dma_resv object.
So we can drop holding this lock to allow concurrent attach
and detach operations.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/dma-buf/dma-buf.c | 16 ----------------
1 file changed, 16 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 753be84b5fd6..c736e67ae1a1 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -685,8 +685,6 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
attach->dmabuf = dmabuf;
attach->dynamic_mapping = dynamic_mapping;
- mutex_lock(&dmabuf->lock);
-
if (dmabuf->ops->attach) {
ret = dmabuf->ops->attach(dmabuf, attach);
if (ret)
@@ -696,8 +694,6 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
list_add(&attach->node, &dmabuf->attachments);
dma_resv_unlock(dmabuf->resv);
- mutex_unlock(&dmabuf->lock);
-
/* When either the importer or the exporter can't handle dynamic
* mappings we cache the mapping here to avoid issues with the
* reservation object lock.
@@ -726,7 +722,6 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
err_attach:
kfree(attach);
- mutex_unlock(&dmabuf->lock);
return ERR_PTR(ret);
err_unlock:
@@ -776,14 +771,12 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
dma_resv_unlock(attach->dmabuf->resv);
}
- mutex_lock(&dmabuf->lock);
dma_resv_lock(dmabuf->resv, NULL);
list_del(&attach->node);
dma_resv_unlock(dmabuf->resv);
if (dmabuf->ops->detach)
dmabuf->ops->detach(dmabuf, attach);
- mutex_unlock(&dmabuf->lock);
kfree(attach);
}
EXPORT_SYMBOL_GPL(dma_buf_detach);
@@ -1247,14 +1240,6 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
"size", "flags", "mode", "count", "ino");
list_for_each_entry(buf_obj, &db_list.head, list_node) {
- ret = mutex_lock_interruptible(&buf_obj->lock);
-
- if (ret) {
- seq_puts(s,
- "\tERROR locking buffer object: skipping\n");
- continue;
- }
-
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
buf_obj->file->f_flags, buf_obj->file->f_mode,
@@ -1307,7 +1292,6 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
count++;
size += buf_obj->size;
- mutex_unlock(&buf_obj->lock);
}
seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size);
--
2.17.1
