linux-kernel - [PATCH] TPM: Fixup boot probe timeout for tpm

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Message-ID: <20090909232218.GK406@obsidianresearch.com>
Date:	Wed, 9 Sep 2009 17:22:18 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	linux-kernel@...r.kernel.org
Cc:	tpmdd-devel@...ts.sourceforge.net, srajiv@...ux.vnet.ibm.com,
	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>,
	James Morris <jmorris@...ei.org>,
	Jan Beulich <jbeulich@...ell.com>
Subject: [PATCH] TPM: Fixup boot probe timeout for tpm_tis driver

When probing the device in tpm_tis_init the call request_locality
uses timeout_a, which wasn't being initalized until after
request_locality. This results in request_locality falsely timing
out if the chip is still starting. Move the initialization to before
request_locality.

This probably only matters for embedded cases (ie mine), a BIOS likely
gets the TPM into a state where this code path isn't necessary.

Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
---
 drivers/char/tpm/tpm_tis.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 241b5ae..c1e5ab8 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -450,6 +450,12 @@ static int tpm_tis_init(struct device *dev, u32 start,
 		goto out_err;
 	}
 
+	/* Default timeouts */
+	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+
 	if (request_locality(chip, 0) != 0) {
 		rc = -ENODEV;
 		goto out_err;
@@ -457,12 +463,6 @@ static int tpm_tis_init(struct device *dev, u32 start,
 
 	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
 
-	/* Default timeouts */
-	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
-	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
-
 	dev_info(dev,
 		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
-- 
1.5.4.2

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