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Subject[PATCH v7 09/10] tpm, tpm_tis: Claim locality in interrupt handler
Date
From: Lino Sanfilippo <l.sanfilippo@kunbus.com>

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@kunbus.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Michael Niewöhner <linux@mniewoehner.de>
---
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 83b31c25e55c..307a7a3a55c6 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -761,7 +761,9 @@ 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_release_locality(chip, 0);
if (rc < 0)
return IRQ_NONE;

--
2.25.1
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