linux-kernel - [PATCH v7 08/10] tpm, tpm_tis: Request threaded interrupt handler

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Message-Id: <20220629232653.1306735-9-LinoSanfilippo@gmx.de>
Date:   Thu, 30 Jun 2022 01:26:51 +0200
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,
        l.sanfilippo@...bus.com, LinoSanfilippo@....de, lukas@...ner.de,
        p.rosenberger@...bus.com
Subject: [PATCH v7 08/10] tpm, tpm_tis: Request threaded interrupt handler

From: Lino Sanfilippo <l.sanfilippo@...bus.com>

The TIS interrupt handler at least has to read and write the interrupt
status register. In case of SPI both operations result in a call to
tpm_tis_spi_transfer() which uses the bus_lock_mutex of the spi device
and thus must only be called from a sleepable context.

To ensure this request a threaded interrupt handler.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
Tested-by: Michael Niewöhner <linux@...ewoehner.de>
---
 drivers/char/tpm/tpm_tis_core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index e50a2c78de9f..83b31c25e55c 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -802,8 +802,11 @@ 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) {
+
+	rc = devm_request_threaded_irq(chip->dev.parent, irq, NULL,
+				       tis_int_handler, IRQF_ONESHOT | flags,
+				       dev_name(&chip->dev), chip);
+	if (rc) {
 		dev_info(&chip->dev, "Unable to request irq: %d for probe\n",
 			 irq);
 		return -1;
-- 
2.25.1