tpm, tpm_tis: do not check for the active locality in interrupt handler

After driver initialization tpm_tis_data->locality may only be modified in
case of a LOCALITY CHANGE interrupt. In this case the interrupt handler
iterates over all localities only to assign the active one to
tpm_tis_data->locality.

However this information is never used any more, so the assignment is not
needed.
Furthermore without the assignment tpm_tis_data->locality cannot change any
more at driver runtime, and thus no protection against concurrent
modification is required when the variable is read at other places.

So remove this iteration entirely.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 8981433abb0ff46f988c91689b2b0a460171efd2..717b81435cbd050f6d041c25673bcf80f693435f 100644 (file)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -732,7 +732,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
        struct tpm_chip *chip = dev_id;
        struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
        u32 interrupt;
-       int i, rc;
+       int rc;
 
        rc = tpm_tis_read32(priv, TPM_INT_STATUS(priv->locality), &interrupt);
        if (rc < 0)
@@ -744,10 +744,7 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
        set_bit(TPM_TIS_IRQ_TESTED, &priv->flags);
        if (interrupt & TPM_INTF_DATA_AVAIL_INT)
                wake_up_interruptible(&priv->read_queue);
-       if (interrupt & TPM_INTF_LOCALITY_CHANGE_INT)
-               for (i = 0; i < 5; i++)
-                       if (check_locality(chip, i))
-                               break;
+
        if (interrupt &
            (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
             TPM_INTF_CMD_READY_INT))