linux-kernel - [PATCH] tpm: fix panic caused by "tpm: Autodetect itpm devices"

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Message-Id: <1294370641-6791-1-git-send-email-olof@lixom.net>
Date:	Thu,  6 Jan 2011 21:24:01 -0600
From:	Olof Johansson <olof@...om.net>
To:	linux-kernel@...r.kernel.org
Cc:	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>,
	tpmdd-devel@...ts.sourceforge.net,
	James Morris <jmorris@...ei.org>,
	Olof Johansson <olof@...om.net>,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH] tpm: fix panic caused by "tpm: Autodetect itpm devices"

commit 3f0d3d016d89a5efb8b926d4707eb21fa13f3d27 adds a check for
PNP device id to the common tpm_tis_init() function, which in some
cases (force=1) will be called without the device being a member of
a pnp_dev. Oopsing and panics ensue.

Move the test up to before the call to tpm_tis_init(), since it
just modifies a global variable anyway.

Signed-off-by: Olof Johansson <olof@...om.net>
Cc: Matthew Garrett <mjg@...hat.com>
Cc: stable@...nel.org [2.6.37+]
---
 drivers/char/tpm/tpm_tis.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index c17a305..dd21df5 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -493,9 +493,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 
-	if (is_itpm(to_pnp_dev(dev)))
-		itpm = 1;
-
 	if (itpm)
 		dev_info(dev, "Intel iTPM workaround enabled\n");
 
@@ -637,6 +634,9 @@ static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 	else
 		interrupts = 0;
 
+	if (is_itpm(pnp_dev))
+		itpm = 1;
+
 	return tpm_tis_init(&pnp_dev->dev, start, len, irq);
 }
 
-- 
1.7.3.GIT

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