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Commit b5bc8765 authored by annamraj's avatar annamraj
Browse files

msm: camera: Make use of mutex lock to avoid race condition 



Make use of mutex lock to access IOCTL so that two threads
can avoid race condition.

Change-Id: I00db78a42c86eef8a157b5b3547e4ca0006b0853
Signed-off-by: default avatarannamraj <annamraj@codeaurora.org>
parent cea658fb

drivers/media/platform/msm/camera_v2/fd/msm_fd_dev.c

+5 −1
Original line number Diff line number Diff line
@@ -1055,14 +1055,18 @@ static int msm_fd_s_ctrl(struct file *file, void *fh, struct v4l2_control *a) 
			a->value = ctx->format.size->work_size;

		break;

	case V4L2_CID_FD_WORK_MEMORY_FD:

		mutex_lock(&ctx->fd_device->recovery_lock);

		if (ctx->work_buf.fd != -1)

			msm_fd_hw_unmap_buffer(&ctx->work_buf);

		if (a->value >= 0) {

			ret = msm_fd_hw_map_buffer(&ctx->mem_pool,

				a->value, &ctx->work_buf);

			if (ret < 0)

			if (ret < 0) {

				mutex_unlock(&ctx->fd_device->recovery_lock);

				return ret;

			}

		}

		mutex_unlock(&ctx->fd_device->recovery_lock);

		break;

	default:

		return -EINVAL;