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ANDROID: dma-buf: add get_each_dmabuf function

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Add and export get_each_dmabuf function which helps in
traversing the db_list, this will be used by the minidump
module to get dmabuf info.

Bug: 181203151
Change-Id: Ie24788fcf9cf0a49316cb871dcb9191e8084ccde
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
This commit is contained in:
Vijayanand Jitta
2021-02-25 17:23:25 +05:30
committed by Suren Baghdasaryan
parent a05c4bdbc0
commit 51b610b87d
2 changed files with 26 additions and 0 deletions
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24
drivers/dma-buf/dma-buf.c
View File

@@ -38,6 +38,30 @@ struct dma_buf_list {
static struct dma_buf_list db_list;
/*
* This function helps in traversing the db_list and calls the
* callback function which can extract required info out of each
* dmabuf.
*/
int get_each_dmabuf(int (*callback)(const struct dma_buf *dmabuf,
void *private), void *private)
{
struct dma_buf *buf;
int ret = mutex_lock_interruptible(&db_list.lock);
if (ret)
return ret;
list_for_each_entry(buf, &db_list.head, list_node) {
ret = callback(buf, private);
if (ret)
break;
}
mutex_unlock(&db_list.lock);
return ret;
}
EXPORT_SYMBOL_GPL(get_each_dmabuf);
static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
{
struct dma_buf *dmabuf;

2
include/linux/dma-buf.h
View File

@@ -588,6 +588,8 @@ dma_buf_attachment_is_dynamic(struct dma_buf_attachment *attach)
return !!attach->importer_ops;
}
int get_each_dmabuf(int (*callback)(const struct dma_buf *dmabuf,
void *private), void *private);
int is_dma_buf_file(struct file *file);
struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
struct device *dev);