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

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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;