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From: Lino Sanfilippo <LinoSanfilippo@gmx.de>
To: peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca
Cc: stefanb@linux.vnet.ibm.com, linux@mniewoehner.de,
	linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
	jandryuk@gmail.com, pmenzel@molgen.mpg.de,
	l.sanfilippo@kunbus.com, LinoSanfilippo@gmx.de, lukas@wunner.de,
	p.rosenberger@kunbus.com
Subject: [PATCH v9 09/12] tpm, tpm_tis: Request threaded interrupt handler
Date: Thu, 10 Nov 2022 16:25:30 +0100	[thread overview]
Message-ID: <20221110152533.24243-10-LinoSanfilippo@gmx.de> (raw)
In-Reply-To: <20221110152533.24243-1-LinoSanfilippo@gmx.de>

From: Lino Sanfilippo <l.sanfilippo@kunbus.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@kunbus.com>
Tested-by: Michael Niewöhner <linux@mniewoehner.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
---
 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 ecde684a8f80..ced8eae3e4d5 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -813,8 +813,11 @@ 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;
-- 
2.36.1


  parent reply	other threads:[~2022-11-10 15:27 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-10 15:25 [PATCH v9 00/12] TPM IRQ fixes Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 01/12] tpm, tpm_tis: Avoid cache incoherency in test for interrupts Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 02/12] tpm, tpm_tis: Claim locality before writing TPM_INT_ENABLE register Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 03/12] tpm, tpm_tis: Disable interrupts if tpm_tis_probe_irq() failed Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 04/12] tpm, tmp_tis: Claim locality before writing interrupt registers Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 05/12] tpm, tpm_tis: Only handle supported interrupts Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 06/12] tpm, tpm_tis: Move interrupt mask checks into own function Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 07/12] tpm, tpm_tis: do not check for the active locality in interrupt handler Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 08/12] tpm, tpm: Implement usage counter for locality Lino Sanfilippo
2022-11-10 15:25 ` Lino Sanfilippo [this message]
2022-11-10 15:25 ` [PATCH v9 10/12] tpm, tpm_tis: Claim locality in interrupt handler Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 11/12] tpm, tpm_tis: Claim locality when interrupts are reenabled on resume Lino Sanfilippo
2022-11-10 15:25 ` [PATCH v9 12/12] tpm, tpm_tis: Enable interrupt test Lino Sanfilippo
2022-11-14 13:35   ` Lino Sanfilippo

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