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sb/intel: Check for NULL-return of pcidev_on_root()

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In these cases we have to expect a NULL pointer because the IGD
device 0:2.0 may be disabled.

The behaviour still differs from using dev_find_slot(), which may
return a disabled device. Though, if you'd try to read its config
space you'd only read garbage (0xff) and in cases where we filled
ACPI data with devicetree information, the information shouldn't
be interpreted by the OS because of the disabled device.

Change-Id: I1bab8fa3a82daca71d03453315cdd69d8951fc24
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/30879
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Nico Huber
2019-01-12 14:58:20 +01:00
parent 8c1258ab8b
commit 744d6bd638
6 changed files with 27 additions and 13 deletions
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7
src/southbridge/intel/ibexpeak/lpc.c
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@ -632,8 +632,11 @@ static void southbridge_inject_dsdt(struct device *dev)
gnvs->apic = 1;
gnvs->mpen = 1; /* Enable Multi Processing */
gnvs->pcnt = dev_count_cpu();
gnvs->ndid = gfx->ndid;
memcpy(gnvs->did, gfx->did, sizeof(gnvs->did));
if (gfx) {
gnvs->ndid = gfx->ndid;
memcpy(gnvs->did, gfx->did, sizeof(gnvs->did));
}
/* And tell SMI about it */
smm_setup_structures(gnvs, NULL, NULL);