linux-kernel - [PATCH for-linus-v5.5-rc6 2/3] tpm: Revert "tpm_tis_core: Set TPM_CHIP_FLAG

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Message-Id: <20200103232935.11314-3-jarkko.sakkinen@linux.intel.com>
Date:   Sat,  4 Jan 2020 01:29:33 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     Stefan Berger <stefanb@...ux.ibm.com>, stable@...r.kernel.org,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Xiaoping Zhou <xiaoping.zhou@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH for-linus-v5.5-rc6 2/3] tpm: Revert "tpm_tis_core: Set TPM_CHIP_FLAG_IRQ before probing for interrupts"

From: Stefan Berger <stefanb@...ux.ibm.com>

There has been a bunch of reports (one from kernel bugzilla linked)
reporting that when this commit is applied it causes on some machines
boot freezes.

Unfortunately hardware where this commit causes a failure is not widely
available (only one I'm aware is Lenovo T490), which means we cannot
predict yet how long it will take to properly fix tpm_tis interrupt
probing.

Thus, the least worst short term action is to revert the code to the
state before this commit. In long term we need fix the tpm_tis probing
code to work on machines that Stefan's fix was supposed to fix.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=205935
Fixes: 1ea32c83c699 ("tpm_tis_core: Set TPM_CHIP_FLAG_IRQ before probing for interrupts")
Cc: stable@...r.kernel.org
Cc: Jerry Snitselaar <jsnitsel@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Tested-by: Dan Williams <dan.j.williams@...el.com>
Tested-by: Xiaoping Zhou <xiaoping.zhou@...el.com>
Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Reported-by: Jerry Snitselaar <jsnitsel@...hat.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 drivers/char/tpm/tpm_tis_core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 8af2cee1a762..5dc52c4e2292 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1060,7 +1060,6 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 		}
 
 		tpm_chip_start(chip);
-		chip->flags |= TPM_CHIP_FLAG_IRQ;
 		if (irq) {
 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
 						 irq);
-- 
2.20.1