linux-kernel - [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo P620 devices

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Date:   Fri, 4 Aug 2023 17:08:40 +0000
From:   Jonathan McDowell <noodles@...a.com>
To:     Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>
CC:     Jason Gunthorpe <jgg@...pe.ca>,
        Lino Sanfilippo <l.sanfilippo@...bus.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo P620 devices

The Lenovo ThinkStation P620 suffers from an irq storm issue like
various other Lenovo machines, so add an entry for it to
tpm_tis_dmi_table and force polling.

It is worth noting that 481c2d14627de8ecbb54dd125466e4b4a5069b47
(tpm,tpm_tis: Disable interrupts after 1000 unhandled IRQs) does not
seem to fix the problem on this machine, but setting
tpm_tis.interrupts=0 on the kernel command line does.

Cc: stable@...r.kernel.org # v6.4+
Fixes: e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
Signed-off-by: Jonathan McDowell <noodles@...a.com>
---
 drivers/char/tpm/tpm_tis.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index cc42cf3de960..0cbd745374dc 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -162,6 +162,14 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
 			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L590"),
 		},
 	},
+	{
+		.callback = tpm_tis_disable_irq,
+		.ident = "ThinkStation P620",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P620"),
+		},
+	},
 	{
 		.callback = tpm_tis_disable_irq,
 		.ident = "UPX-TGL",
-- 
2.41.0