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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /drivers/dma-buf/dma-buf.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
-rw-r--r--drivers/dma-buf/dma-buf.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index c5a9138a6..155c14649 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -29,6 +29,7 @@
#include <linux/anon_inodes.h>
#include <linux/export.h>
#include <linux/debugfs.h>
+#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/reservation.h>
@@ -72,6 +73,7 @@ static int dma_buf_release(struct inode *inode, struct file *file)
if (dmabuf->resv == (struct reservation_object *)&dmabuf[1])
reservation_object_fini(dmabuf->resv);
+ module_put(dmabuf->owner);
kfree(dmabuf);
return 0;
}
@@ -285,6 +287,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
struct reservation_object *resv = exp_info->resv;
struct file *file;
size_t alloc_size = sizeof(struct dma_buf);
+
if (!exp_info->resv)
alloc_size += sizeof(struct reservation_object);
else
@@ -302,14 +305,20 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
return ERR_PTR(-EINVAL);
}
+ if (!try_module_get(exp_info->owner))
+ return ERR_PTR(-ENOENT);
+
dmabuf = kzalloc(alloc_size, GFP_KERNEL);
- if (dmabuf == NULL)
+ if (!dmabuf) {
+ module_put(exp_info->owner);
return ERR_PTR(-ENOMEM);
+ }
dmabuf->priv = exp_info->priv;
dmabuf->ops = exp_info->ops;
dmabuf->size = exp_info->size;
dmabuf->exp_name = exp_info->exp_name;
+ dmabuf->owner = exp_info->owner;
init_waitqueue_head(&dmabuf->poll);
dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll;
dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0;
@@ -545,7 +554,8 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len,
return -EINVAL;
if (dmabuf->ops->begin_cpu_access)
- ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction);
+ ret = dmabuf->ops->begin_cpu_access(dmabuf, start,
+ len, direction);
return ret;
}
@@ -649,7 +659,7 @@ EXPORT_SYMBOL_GPL(dma_buf_kunmap);
* @dmabuf: [in] buffer that should back the vma
* @vma: [in] vma for the mmap
* @pgoff: [in] offset in pages where this mmap should start within the
- * dma-buf buffer.
+ * dma-buf buffer.
*
* This function adjusts the passed in vma so that it points at the file of the
* dma_buf operation. It also adjusts the starting pgoff and does bounds
@@ -826,6 +836,7 @@ static int dma_buf_describe(struct seq_file *s)
static int dma_buf_show(struct seq_file *s, void *unused)
{
void (*func)(struct seq_file *) = s->private;
+
func(s);
return 0;
}
@@ -847,7 +858,9 @@ static struct dentry *dma_buf_debugfs_dir;
static int dma_buf_init_debugfs(void)
{
int err = 0;
+
dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL);
+
if (IS_ERR(dma_buf_debugfs_dir)) {
err = PTR_ERR(dma_buf_debugfs_dir);
dma_buf_debugfs_dir = NULL;