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tpm_tis: Return 0 for every register in case of failure mode

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Rather than returning ~0, return 0 for every register in case of failure
mode. The '0' is better to indicate that there's no device there. It avoids
SeaBIOS detecting a device and getting stuck on it trying to read and write
its registers.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Stefan Berger 2017-11-10 22:33:14 -05:00 committed by Stefan Berger
parent ad4aca69bb
commit 6cd65969da
1 changed files with 1 additions and 1 deletions
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hw/tpm/tpm_tis.c
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@ -545,7 +545,7 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr,
uint8_t v; uint8_t v;
if (tpm_backend_had_startup_error(s->be_driver)) { if (tpm_backend_had_startup_error(s->be_driver)) {
return val; return 0;
} }
switch (offset) { switch (offset) {