tpm: cmd_ready command can be issued only after granting locality
commit 888d867df4417deffc33927e6fc2c6925736fe92 upstream.
The correct sequence is to first request locality and only after
that perform cmd_ready handshake, otherwise the hardware will drop
the subsequent message as from the device point of view the cmd_ready
handshake wasn't performed. Symmetrically locality has to be relinquished
only after going idle handshake has completed, this requires that
go_idle has to poll for the completion and as well locality
relinquish has to poll for completion so it is not overridden
in back to back commands flow.
Two wrapper functions are added (request_locality relinquish_locality)
to simplify the error handling.
The issue is only visible on devices that support multiple localities.
Fixes: 877c57d0d0ca ("tpm_crb: request and relinquish locality 0")
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 881312d..2a6c3d9 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -49,7 +49,7 @@
bool (*update_timeouts)(struct tpm_chip *chip,
unsigned long *timeout_cap);
int (*request_locality)(struct tpm_chip *chip, int loc);
- void (*relinquish_locality)(struct tpm_chip *chip, int loc);
+ int (*relinquish_locality)(struct tpm_chip *chip, int loc);
void (*clk_enable)(struct tpm_chip *chip, bool value);
};