[PATCH v10 11/14] tpm, tpm_tis: Claim locality in interrupt handler

From: Lino Sanfilippo
Date: Sun Nov 20 2022 - 08:33:15 EST


From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>

Writing the TPM_INT_STATUS register in the interrupt handler to clear the
interrupts only has effect if a locality is held. Since this is not
guaranteed at the time the interrupt is fired, claim the locality
explicitly in the handler.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Tested-by: Michael Niewöhner <linux@xxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 6c765a4406bc..4312c5cc13da 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -772,7 +772,9 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
wake_up_interruptible(&priv->int_queue);

/* Clear interrupts handled with TPM_EOI */
+ tpm_tis_request_locality(chip, 0);
rc = tpm_tis_write32(priv, TPM_INT_STATUS(priv->locality), interrupt);
+ tpm_tis_relinquish_locality(chip, 0);
if (rc < 0)
return IRQ_NONE;

--
2.36.1