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agp/hp: fail gracefully if we don't find an IOC

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Bail out if we don't find an enclosing IOC.  Previously, if we didn't
find one, we tried to set things up using garbage for the SBA/IOC register
address, which causes a crash.

This crash only happens if firmware supplies a defective ACPI namespace, so
it doesn't fix any problems in the field.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Bjorn Helgaas 2010-01-07 12:58:56 -07:00 committed by Dave Airlie
parent 67fe63b071
commit 3d4a7882b1
1 changed files with 3 additions and 0 deletions
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3
drivers/char/agp/hp-agp.c
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@ -508,6 +508,9 @@ zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
handle = parent;
} while (ACPI_SUCCESS(status));
if (ACPI_FAILURE(status))
return AE_OK; /* found no enclosing IOC */
if (hp_zx1_setup(sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa))
return AE_OK;