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Message-Id: <20221110152533.24243-11-LinoSanfilippo@gmx.de>
Date: Thu, 10 Nov 2022 16:25:31 +0100
From: Lino Sanfilippo <LinoSanfilippo@....de>
To: peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc: stefanb@...ux.vnet.ibm.com, linux@...ewoehner.de,
linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
jandryuk@...il.com, pmenzel@...gen.mpg.de, l.sanfilippo@...bus.com,
LinoSanfilippo@....de, lukas@...ner.de, p.rosenberger@...bus.com
Subject: [PATCH v9 10/12] tpm, tpm_tis: Claim locality in interrupt handler
From: Lino Sanfilippo <l.sanfilippo@...bus.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@...bus.com>
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Tested-by: Michael Niewöhner <linux@...ewoehner.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 ced8eae3e4d5..a0a1b1a3ddc6 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
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