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drm/i915: Don't try to reference the fb in get_initial_plane_config()

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Tvrtko noticed a new warning on boot:

  WARNING: CPU: 1 PID: 353 at include/linux/kref.h:47 drm_framebuffer_reference+0x6c/0x80 [drm]()
  Call Trace:
  [<ffffffff8161f10c>] dump_stack+0x4f/0x7b
  [<ffffffff81052caa>] warn_slowpath_common+0xaa/0xd0
  [<ffffffff81052d8a>] warn_slowpath_null+0x1a/0x20
  [<ffffffffa00d035c>] drm_framebuffer_reference+0x6c/0x80 [drm]
  [<ffffffffa01c0df7>] update_state_fb.isra.54+0x47/0x50 [i915]
  [<ffffffffa01ccd5c>] skylake_get_initial_plane_config+0x93c/0x950 [i915]
  [<ffffffffa01e8721>] intel_modeset_init+0x1551/0x17c0 [i915]
  [<ffffffffa02476e0>] i915_driver_load+0xed0/0x11e0 [i915]
  [<ffffffff81627aa1>] ? _raw_spin_unlock_irqrestore+0x51/0x70
  [<ffffffffa00ca8b7>] drm_dev_register+0x77/0x110 [drm]
  [<ffffffffa00cda3b>] drm_get_pci_dev+0x11b/0x1f0 [drm]
  [<ffffffff81098e3d>] ? trace_hardirqs_on+0xd/0x10
  [<ffffffff81627aa1>] ? _raw_spin_unlock_irqrestore+0x51/0x70
  [<ffffffffa0145276>] i915_pci_probe+0x56/0x60 [i915]
  [<ffffffff813ad59c>] pci_device_probe+0x7c/0x100
  [<ffffffff81466aad>] driver_probe_device+0x16d/0x380

We cannot take a reference at this point, not before
intel_framebuffer_init() and the underlying drm_framebuffer_init().

Introduced in:

  commit 706dc7b549175e47f23e913b7f1e52874a7d0f56
  Author: Matt Roper <matthew.d.roper@intel.com>
  Date:   Tue Feb 3 13:10:04 2015 -0800

      drm/i915: Ensure plane->state->fb stays in sync with plane->fb

v2: Don't move update_state_fb(). It was moved around because I
    originally put update_state_fb() in intel_alloc_plane_obj() before
    finding a better place. (Matt)

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reported-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Damien Lespiau 2015-02-05 18:30:20 +00:00 committed by Daniel Vetter
parent 6bf129df6f
commit f55548b5af
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/intel_display.c
View File

@ -2438,8 +2438,10 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
if (!intel_crtc->base.primary->fb)
return;
if (intel_alloc_plane_obj(intel_crtc, plane_config))
if (intel_alloc_plane_obj(intel_crtc, plane_config)) {
update_state_fb(intel_crtc->base.primary);
return;
}
kfree(intel_crtc->base.primary->fb);
intel_crtc->base.primary->fb = NULL;
@ -6652,7 +6654,6 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
plane_config->size);
crtc->base.primary->fb = fb;
update_state_fb(crtc->base.primary);
}
static void chv_crtc_clock_get(struct intel_crtc *crtc,
@ -7690,7 +7691,6 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
plane_config->size);
crtc->base.primary->fb = fb;
update_state_fb(crtc->base.primary);
return;
error:
@ -7782,7 +7782,6 @@ ironlake_get_initial_plane_config(struct intel_crtc *crtc,
plane_config->size);
crtc->base.primary->fb = fb;
update_state_fb(crtc->base.primary);
}
static bool ironlake_get_pipe_config(struct intel_crtc *crtc,