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authorChristian König <christian.koenig@amd.com>2019-10-18 17:30:19 +0300
committerChristian König <christian.koenig@amd.com>2019-10-24 10:18:23 +0300
commitf45f57cce5841516bc53026b91952984d52e7126 (patch)
tree492c05cd5f8073a67aa480cef7e85ee6a6abc28f /drivers/dma-buf
parent15fd552d186cb0df34b9d36a07dd6677c4da56bc (diff)
downloadlinux-f45f57cce5841516bc53026b91952984d52e7126.tar.xz
dma-buf: stop using the dmabuf->lock so much v2
The attachment list is now protected by the dma_resv object. Stop holding the dma_buf->lock while calling ->attach/->detach, this allows for concurrent attach/detach operations. v2: cleanup commit message and locking in _debug_show() Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/336790
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-buf.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 0573879a222a..d377b4ca66bf 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);
@@ -1248,13 +1241,9 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
list_for_each_entry(buf_obj, &db_list.head, list_node) {
- ret = mutex_lock_interruptible(&buf_obj->lock);
- if (ret)
- goto error_unlock_list;
-
ret = dma_resv_lock_interruptible(buf_obj->resv, NULL);
if (ret)
- goto error_unlock_buf;
+ goto error_unlock;
seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\t%08lu\t%s\n",
buf_obj->size,
@@ -1307,7 +1296,6 @@ 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);
@@ -1315,9 +1303,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
mutex_unlock(&db_list.lock);
return 0;
-error_unlock_buf:
- mutex_unlock(&buf_obj->lock);
-error_unlock_list:
+error_unlock:
mutex_unlock(&db_list.lock);
return ret;
}