linux-kernel - [PATCH] tpm:correct tpm timeouts to jiffies conversion

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Date:	Thu, 5 Jun 2008 22:19:53 +0200 (CEST)
From:	Marcin Obara <marcin_obara@...rs.sourceforge.net>
To:	tpmdd-devel@...ts.sourceforge.net,
	Marcel Selhorst <tpm@...horst.net>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] tpm:correct tpm timeouts to jiffies conversion

This patch fixes timeouts conversion to jiffies,
by replacing msecs_to_jiffies() calls with usecs_to_jiffies().
According to TCG TPM Specification Version 1.2 Revision 103 (pages 166, 167)
TPM timeouts and durations are returned in microseconds (usec)
not in miliseconds (msec).

Signed-off-by: Marcin Obara <marcin_obara@...rs.sourceforge.net>

--- linux/drivers/char/tpm/tpm.c	2008-06-05 20:57:06.000000000 +0200
+++ linux_tpm/drivers/char/tpm/tpm.c	2008-06-05 20:54:52.000000000 +0200
@@ -524,19 +524,19 @@ void tpm_get_timeouts(struct tpm_chip *c
 	timeout =
 	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
 	if (timeout)
-		chip->vendor.timeout_a = msecs_to_jiffies(timeout);
+		chip->vendor.timeout_a = usecs_to_jiffies(timeout);
 	timeout =
 	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
 	if (timeout)
-		chip->vendor.timeout_b = msecs_to_jiffies(timeout);
+		chip->vendor.timeout_b = usecs_to_jiffies(timeout);
 	timeout =
 	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
 	if (timeout)
-		chip->vendor.timeout_c = msecs_to_jiffies(timeout);
+		chip->vendor.timeout_c = usecs_to_jiffies(timeout);
 	timeout =
 	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
 	if (timeout)
-		chip->vendor.timeout_d = msecs_to_jiffies(timeout);
+		chip->vendor.timeout_d = usecs_to_jiffies(timeout);
 
 duration:
 	memcpy(data, tpm_cap, sizeof(tpm_cap));
@@ -553,15 +553,15 @@ duration:
 		return;
 
 	chip->vendor.duration[TPM_SHORT] =
-	    msecs_to_jiffies(be32_to_cpu
+	    usecs_to_jiffies(be32_to_cpu
 			     (*((__be32 *) (data +
 					    TPM_GET_CAP_RET_UINT32_1_IDX))));
 	chip->vendor.duration[TPM_MEDIUM] =
-	    msecs_to_jiffies(be32_to_cpu
+	    usecs_to_jiffies(be32_to_cpu
 			     (*((__be32 *) (data +
 					    TPM_GET_CAP_RET_UINT32_2_IDX))));
 	chip->vendor.duration[TPM_LONG] =
-	    msecs_to_jiffies(be32_to_cpu
+	    usecs_to_jiffies(be32_to_cpu
 			     (*((__be32 *) (data +
 					    TPM_GET_CAP_RET_UINT32_3_IDX))));
 }
--
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