sync_file: Return consistent status in SYNC_IOC_FILE_INFO

sync_file_ioctl_fence_info has a race between filling the status
of the underlying fences and the overall status of the sync_file.
If fence transitions in the time frame between its sync_fill_fence_info
and the later dma_fence_is_signaled for the sync_file, the returned
information is inconsistent showing non-signaled underlying fences but
an overall signaled state.

This patch changes sync_file_ioctl_fence_info to track what has been
encoded and using that as the overall sync_file status.

Tested-by: Vamsidhar Reddy Gaddam <vamsidhar.gaddam@arm.com>
Signed-off-by: John Einar Reitan <john.reitan@arm.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009134936.27219-1-john.reitan@arm.com

diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
index 66fb40d..0383063 100644 (file)
--- a/drivers/dma-buf/sync_file.c
+++ b/drivers/dma-buf/sync_file.c
@@ -383,7 +383,7 @@ err_put_fd:
        return err;
 }
 
-static void sync_fill_fence_info(struct dma_fence *fence,
+static int sync_fill_fence_info(struct dma_fence *fence,
                                 struct sync_fence_info *info)
 {
        strlcpy(info->obj_name, fence->ops->get_timeline_name(fence),
@@ -399,6 +399,8 @@ static void sync_fill_fence_info(struct dma_fence *fence,
                test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags) ?
                ktime_to_ns(fence->timestamp) :
                ktime_set(0, 0);
+
+       return info->status;
 }
 
 static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
@@ -424,8 +426,12 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
         * sync_fence_info and return the actual number of fences on
         * info->num_fences.
         */
-       if (!info.num_fences)
+       if (!info.num_fences) {
+               info.status = dma_fence_is_signaled(sync_file->fence);
                goto no_fences;
+       } else {
+               info.status = 1;
+       }
 
        if (info.num_fences < num_fences)
                return -EINVAL;
@@ -435,8 +441,10 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
        if (!fence_info)
                return -ENOMEM;
 
-       for (i = 0; i < num_fences; i++)
-               sync_fill_fence_info(fences[i], &fence_info[i]);
+       for (i = 0; i < num_fences; i++) {
+               int status = sync_fill_fence_info(fences[i], &fence_info[i]);
+               info.status = info.status <= 0 ? info.status : status;
+       }
 
        if (copy_to_user(u64_to_user_ptr(info.sync_fence_info), fence_info,
                         size)) {
@@ -446,7 +454,6 @@ static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
 
 no_fences:
        sync_file_get_name(sync_file, info.name, sizeof(info.name));
-       info.status = dma_fence_is_signaled(sync_file->fence);
        info.num_fences = num_fences;
 
        if (copy_to_user((void __user *)arg, &info, sizeof(info)))