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author | Darren Stevens <darren@stevens-zone.net> | 2017-01-23 19:42:54 +0000 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-01-24 15:57:02 +1100 |
commit | af2b7fa17eb92e52b65f96604448ff7a2a89ee99 (patch) | |
tree | deba86a57193fdc5facfaa8e73157a4bbef45820 /tools/testing/selftests/gpio | |
parent | 178f358208ceb8b38e5cff3f815e0db4a6a70a07 (diff) |
powerpc: Add missing error check to prom_find_boot_cpu()
prom_init.c calls 'instance-to-package' twice, but the return
is not checked during prom_find_boot_cpu(). The result is then
passed to prom_getprop(), which could be PROM_ERROR. Add a return check
to prevent this.
This was found on a pasemi system, where CFE doesn't have a working
'instance-to package' prom call.
Before Commit 5c0484e25ec0 ('powerpc: Endian safe trampoline') the area
around addr 0 was mostly 0's and this doesn't cause a problem. Once the
macro 'FIXUP_ENDIAN' has been added to head_64.S, the low memory area
now has non-zero values, which cause the prom_getprop() call
to hang.
mpe: Also confirmed that under SLOF if 'instance-to-package' did fail
with PROM_ERROR we would crash in SLOF. So the bug is not specific to
CFE, it's just that other open firmwares don't trigger it because they
have a working 'instance-to-package'.
Fixes: 5c0484e25ec0 ("powerpc: Endian safe trampoline")
Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Darren Stevens <darren@stevens-zone.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/gpio')
0 files changed, 0 insertions, 0 deletions