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

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;