[bug report] drm/vc4: Add support for drawing 3D frames.

[Dan Carpenter]

Hello Eric Anholt,

The patch d5b1a78a772f: "drm/vc4: Add support for drawing 3D frames."
from Nov 30, 2015, leads to the following static checker warning:

	drivers/gpu/drm/vc4/vc4_gem.c:797 vc4_wait_for_seqno_ioctl_helper()
	warn: ret is never (-4)

drivers/gpu/drm/vc4/vc4_gem.c
   790  static int
   791  vc4_wait_for_seqno_ioctl_helper(struct drm_device *dev,
   792                                  uint64_t seqno,
   793                                  uint64_t *timeout_ns)
   794  {
   795          unsigned long start = jiffies;
   796          int ret = vc4_wait_for_seqno(dev, seqno, *timeout_ns, true);
   797  
   798          if ((ret == -EINTR || ret == -ERESTARTSYS) && *timeout_ns != ~0ull) {
                     ^^^^^^^^^^^^^
Presumably this could be removed?

   799                  uint64_t delta = jiffies_to_nsecs(jiffies - start);
   800  
   801                  if (*timeout_ns >= delta)
   802                          *timeout_ns -= delta;
   803          }
   804  
   805          return ret;
   806  }


regards,
dan carpenter