[RFC PATCH 09/17] drm/i915/vga: Drop uses of pci_read_config_*() return value

["Saheed O. Bolarinwa" <refactormyself@gmail.com>]

The return value of pci_read_config_*() may not indicate a device error.
However, the value read by these functions is more likely to indicate
this kind of error. This presents two overlapping ways of reporting
errors and complicates error checking.

It is possible to move to one single way of checking for error if the
dependency on the return value of these functions is removed, then it
can later be made to return void.

Remove all uses of the return value of pci_read_config_*().
Check the actual value read for ~0. In this case, ~0 is an invalid
value thus it indicates some kind of error.

Suggested-by: Bjorn Helgaas <bjorn@helgaas.com>
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
---
 drivers/gpu/drm/i915/display/intel_vga.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
index be333699c515..6f9406699c9d 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -99,7 +99,8 @@ intel_vga_set_state(struct drm_i915_private *i915, bool enable_decode)
 	unsigned int reg = INTEL_GEN(i915) >= 6 ? SNB_GMCH_CTRL : INTEL_GMCH_CTRL;
 	u16 gmch_ctrl;
 
-	if (pci_read_config_word(i915->bridge_dev, reg, &gmch_ctrl)) {
+	pci_read_config_word(i915->bridge_dev, reg, &gmch_ctrl);
+	if (gmch_ctrl == (u16)~0) {
 		drm_err(&i915->drm, "failed to read control word\n");
 		return -EIO;
 	}
-- 
2.18.4