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 <[email protected]> --- 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 _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
