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drm/nouveau/bar/gf100: ensure BAR is mapped 

If the BAR is zero size, it indicates it was never successfully mapped.
Ensure that the BAR is valid during initialization before attempting to
use it.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Jon Derrick 2019-03-15 18:05:17 -06:00 committed by Ben Skeggs
parent f10b83de1f
commit 12e08beb32
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c
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@ -94,6 +94,8 @@ gf100_bar_oneinit_bar(struct gf100_bar *bar, struct gf100_barN *bar_vm,
return ret;
bar_len = device->func->resource_size(device, bar_nr);
if (!bar_len)
return -ENOMEM;
if (bar_nr == 3 && bar->bar2_halve)
bar_len >>= 1;