linux-kernel - [PATCH 1/4] tpm: Use a threaded interrupt handler

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Message-Id: <1613955394-13152-2-git-send-email-LinoSanfilippo@gmx.de>
Date:   Mon, 22 Feb 2021 01:56:31 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc:     stefanb@...ux.vnet.ibm.com, James.Bottomley@...senpartnership.com,
        jsnitsel@...hat.com, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, LinoSanfilippo@....de
Subject: [PATCH 1/4] tpm: Use a threaded interrupt handler

Writing and reading registers over SPI requires a sleepable context, since
a mutex is used in the concerning functions. So instead of installing a
generic interrupt handler use one for threaded interrupts. This provides
the same functionality as before but also allows SPI functions to be
called.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
---
 drivers/char/tpm/tpm_tis_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 92c51c6..2c956a1 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -771,8 +771,10 @@ static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask,
 	int rc;
 	u32 int_status;
 
-	if (devm_request_irq(chip->dev.parent, irq, tis_int_handler, flags,
-			     dev_name(&chip->dev), chip) != 0) {
+
+	if (devm_request_threaded_irq(chip->dev.parent, irq, NULL,
+				      tis_int_handler, IRQF_ONESHOT | flags,
+				      dev_name(&chip->dev), chip) != 0) {
 		dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
 			 irq);
 		return -1;
-- 
2.7.4