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intel_agp: Don't oops with zero stolen memory 

When "onboard video memory" is set do "disabled" in BIOS on Asus P4P800-VM
board (i865G), kernel oopses with memory corruption:
https://bugs.freedesktop.org/show_bug.cgi?id=28430

Fix that by cleanly aborting the initialization.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Ondrej Zary 2010-06-16 10:13:52 +02:00 committed by Eric Anholt
parent 43b27f40eb
commit 8699be3ef1
1 changed files with 14 additions and 0 deletions
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14
drivers/char/agp/intel-gtt.c
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@ -797,6 +797,10 @@ static int intel_i830_create_gatt_table(struct agp_bridge_data *bridge)
/* we have to call this as early as possible after the MMIO base address is known */
intel_i830_init_gtt_entries();
if (intel_private.gtt_entries == 0) {
iounmap(intel_private.registers);
return -ENOMEM;
}
agp_bridge->gatt_table = NULL;
@ -1279,6 +1283,11 @@ static int intel_i915_create_gatt_table(struct agp_bridge_data *bridge)
/* we have to call this as early as possible after the MMIO base address is known */
intel_i830_init_gtt_entries();
if (intel_private.gtt_entries == 0) {
iounmap(intel_private.gtt);
iounmap(intel_private.registers);
return -ENOMEM;
}
agp_bridge->gatt_table = NULL;
@ -1387,6 +1396,11 @@ static int intel_i965_create_gatt_table(struct agp_bridge_data *bridge)
/* we have to call this as early as possible after the MMIO base address is known */
intel_i830_init_gtt_entries();
if (intel_private.gtt_entries == 0) {
iounmap(intel_private.gtt);
iounmap(intel_private.registers);
return -ENOMEM;
}
agp_bridge->gatt_table = NULL;