[PATCH 4/9] drm/i915: Propagate PCI read/write errors during vga_set_state()

Rodrigo Vivi
2014-02-07T20:37:25Z

From: Chris Wilson <chris@chris-wilson.co.uk>

This has very little effect other than log the errors in case of failure,
and we then hope for the best.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
---
drivers/gpu/drm/i915/intel_display.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6ecd9da..1e9dd84 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11570,12 +11570,21 @@ int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
unsigned reg = INTEL_INFO(dev)->gen >= 6 ? SNB_GMCH_CTRL : INTEL_GMCH_CTRL;
u16 gmch_ctrl;

- pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl);
+ if (pci_read_config_word(dev_priv->bridge_dev, reg, &gmch_ctrl)) {
+ DRM_ERROR("failed to read control word\n");
+ return -EIO;
+ }
+
if (state)
gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
else
gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;
- pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl);
+
+ if (pci_write_config_word(dev_priv->bridge_dev, reg, gmch_ctrl)) {
+ DRM_ERROR("failed to write control word\n");
+ return -EIO;
+ }
+
return 0;
}

--
1.8.3.1