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Date: Wed, 13 Apr 2016 10:22:06 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Peter Huewe <peterhuewe@....de>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Marcel Selhorst <tpmdd@...horst.net>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
tpmdd-devel@...ts.sourceforge.net (moderated list:TPM DEVICE DRIVER),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3] tpm: fix crash in tpm_tis deinitialization
rmmod crashes the driver because tpm_chip_unregister() already sets ops
to NULL. This commit fixes the issue by moving tpm2_shutdown() to
tpm_chip_unregister(). This commit is also cleanup because it removes
duplicate code from tpm_crb and tpm_tis to the core.
v2: make sending shutdown command atomic with nulling ops
v3: forgot to amend updates, sorry :(
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Fixes: 4d3eac5e156a ("tpm: Provide strong locking for device removal")
---
drivers/char/tpm/tpm-chip.c | 1 +
drivers/char/tpm/tpm.h | 2 +-
drivers/char/tpm/tpm2-cmd.c | 1 -
drivers/char/tpm/tpm_crb.c | 3 ---
drivers/char/tpm/tpm_tis.c | 3 ---
5 files changed, 2 insertions(+), 8 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index f62c851..5bc530c 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -269,6 +269,7 @@ static void tpm_del_char_device(struct tpm_chip *chip)
/* Make the driver uncallable. */
down_write(&chip->ops_sem);
+ tpm2_shutdown(chip, TPM2_SU_CLEAR);
chip->ops = NULL;
up_write(&chip->ops_sem);
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 8bc6fb8..1156b34 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -522,7 +522,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
u32 *value, const char *desc);
extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
-extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
+void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
extern int tpm2_do_selftest(struct tpm_chip *chip);
extern int tpm2_gen_interrupt(struct tpm_chip *chip);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 9ce8031..a1673dc 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -773,7 +773,6 @@ void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
dev_warn(&chip->dev, "transmit returned %d while stopping the TPM",
rc);
}
-EXPORT_SYMBOL_GPL(tpm2_shutdown);
/*
* tpm2_calc_ordinal_duration() - maximum duration for a command
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 20155d5..c31b5a7 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -341,9 +341,6 @@ static int crb_acpi_remove(struct acpi_device *device)
struct device *dev = &device->dev;
struct tpm_chip *chip = dev_get_drvdata(dev);
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- tpm2_shutdown(chip, TPM2_SU_CLEAR);
-
tpm_chip_unregister(chip);
return 0;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 1e45e73..a6b2d46 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -681,9 +681,6 @@ static void tpm_tis_remove(struct tpm_chip *chip)
struct priv_data *priv = dev_get_drvdata(&chip->dev);
void __iomem *reg = priv->iobase + TPM_INT_ENABLE(priv->locality);
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
- tpm2_shutdown(chip, TPM2_SU_CLEAR);
-
iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(reg), reg);
release_locality(chip, priv->locality, 1);
}
--
2.7.4
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