linux-kernel - [PATCH] TPM: change 'tpm_suspend

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Date:	Mon, 24 May 2010 22:11:53 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	tpmdd-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	David Safford <safford@...son.ibm.com>,
	James Morris <jmorris@...ei.org>
Subject: [PATCH] TPM: change 'tpm_suspend_pcr' to be module parameter

This gets rid of the following warning:

drivers/char/tpm/tpm.c:1085: warning: ‘tpm_suspend_setup’ defined but not used

and makes the workaround operable in case when TPM is compiled as a module.
As a side-effect the option will be called tpm.suspend_pcr

Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
---

 drivers/char/tpm/tpm.c |   22 ++++++++++------------
 1 files changed, 10 insertions(+), 12 deletions(-)


diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 05ad4a1..7c41335 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -47,6 +47,16 @@ enum tpm_duration {
 #define TPM_MAX_PROTECTED_ORDINAL 12
 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
 
+/*
+ * Bug workaround - some TPM's don't flush the most
+ * recently changed pcr on suspend, so force the flush
+ * with an extend to the selected _unused_ non-volatile pcr.
+ */
+static int tpm_suspend_pcr;
+module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
+MODULE_PARM_DESC(suspend_pcr,
+		 "PCR to use for dummy writes to faciltate flush on suspend.");
+
 static LIST_HEAD(tpm_chip_list);
 static DEFINE_SPINLOCK(driver_lock);
 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
@@ -1077,18 +1087,6 @@ static struct tpm_input_header savestate_header = {
 	.ordinal = TPM_ORD_SAVESTATE
 };
 
-/* Bug workaround - some TPM's don't flush the most
- * recently changed pcr on suspend, so force the flush
- * with an extend to the selected _unused_ non-volatile pcr.
- */
-static int tpm_suspend_pcr;
-static int __init tpm_suspend_setup(char *str)
-{
-	get_option(&str, &tpm_suspend_pcr);
-	return 1;
-}
-__setup("tpm_suspend_pcr=", tpm_suspend_setup);
-
 /*
  * We are about to suspend. Save the TPM state
  * so that it can be restored.
-- 
Dmitry
--
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