diff options
Diffstat (limited to 'drivers/dma-buf/dma-buf.c')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 376bc6b427c..8bd6a2dcde5 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -33,6 +33,8 @@ #include <linux/poll.h> #include <linux/reservation.h> +#include <linux/dmabuf-sync.h> + static inline int is_dma_buf_file(struct file *); struct dma_buf_list { @@ -249,11 +251,38 @@ out: return events; } +static int dma_buf_lock(struct file *file, int cmd, struct file_lock *fl) +{ + struct dma_buf *dmabuf; + unsigned int type; + + if (!is_dma_buf_file(file) || !(fl->fl_flags & FL_SLEEP)) + return -EPERM; + + dmabuf = file->private_data; + + if ((fl->fl_type & F_UNLCK) == F_UNLCK) { + dmabuf_sync_signal(dmabuf); + return 0; + } + + /* convert flock type to dmabuf sync type. */ + if ((fl->fl_type & F_WRLCK) == F_WRLCK) + type = DMA_BUF_ACCESS_W; + else if ((fl->fl_type & F_RDLCK) == F_RDLCK) + type = DMA_BUF_ACCESS_R; + else + return -EINVAL; + + return dmabuf_sync_wait(dmabuf, (unsigned int)current, type); +} + static const struct file_operations dma_buf_fops = { .release = dma_buf_release, .mmap = dma_buf_mmap_internal, .llseek = dma_buf_llseek, .poll = dma_buf_poll, + .lock = dma_buf_lock, }; /* |