tpm: correct tpm timeouts to jiffies conversion
authorMarcin Obara <marcin_obara@users.sourceforge.net>
Thu, 16 Oct 2008 05:04:34 +0000 (22:04 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 16 Oct 2008 18:21:49 +0000 (11:21 -0700)
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).

This fixes a long hang while loading TPM driver, if TPM chip starts in
"Idle" state instead of "Ready" state.  Without this patch - 'modprobe'
may hang for 30 seconds or more.

Signed-off-by: Marcin Obara <marcin_obara@users.sourceforge.net>
Cc: Marcel Selhorst <tpm@selhorst.net>
Cc: Kylene Jo Hall <kjhall@us.ibm.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/char/tpm/tpm.c

index 1fee7034a386f4aa27cf1c5928e8e195f832c0fb..6b5a0e0127a700ce2f75764b7cc666b5bfc8953d 100644 (file)
@@ -525,19 +525,19 @@ void tpm_get_timeouts(struct tpm_chip *chip)
        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));
@@ -554,15 +554,15 @@ 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))));
 }