Currently, read_log() has two implementations: one for ACPI platforms
and the other for device tree(OF) based platforms. The proper one is
selected at compile time using Kconfig and #ifdef in the Makefile,
which is not the recommended approach.

This patch removes the #ifdef in the Makefile by defining a single
read_log() method, which checks for ACPI/OF event log properties at
runtime.

Suggested-by: Jason Gunthorpe <jguntho...@obsidianresearch.com>
Signed-off-by: Nayna Jain <na...@linux.vnet.ibm.com>
Reviewed-by: Jason Gunthorpe <jguntho...@obsidianresearch.com>
---
 drivers/char/tpm/Makefile       | 14 ++++----------
 drivers/char/tpm/tpm_acpi.c     |  9 ++-------
 drivers/char/tpm/tpm_eventlog.c | 18 ++++++++++++++++++
 drivers/char/tpm/tpm_eventlog.h | 22 +++++++++++++---------
 drivers/char/tpm/tpm_of.c       |  8 ++------
 5 files changed, 39 insertions(+), 32 deletions(-)

diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index a385fb8..a05b1eb 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -2,16 +2,10 @@
 # Makefile for the kernel tpm device drivers.
 #
 obj-$(CONFIG_TCG_TPM) += tpm.o
-tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
-tpm-$(CONFIG_ACPI) += tpm_ppi.o
-
-ifdef CONFIG_ACPI
-       tpm-y += tpm_eventlog.o tpm_acpi.o
-else
-ifdef CONFIG_TCG_IBMVTPM
-       tpm-y += tpm_eventlog.o tpm_of.o
-endif
-endif
+tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o \
+               tpm_eventlog.o
+tpm-$(CONFIG_ACPI) += tpm_ppi.o tpm_acpi.o
+tpm-$(CONFIG_OF) += tpm_of.o
 obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
 obj-$(CONFIG_TCG_TIS) += tpm_tis.o
 obj-$(CONFIG_TCG_TIS_SPI) += tpm_tis_spi.o
diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c
index 4d6c2d7..859bdba 100644
--- a/drivers/char/tpm/tpm_acpi.c
+++ b/drivers/char/tpm/tpm_acpi.c
@@ -6,6 +6,7 @@
  *     Stefan Berger <stef...@us.ibm.com>
  *     Reiner Sailer <sai...@watson.ibm.com>
  *     Kylene Hall <kjh...@us.ibm.com>
+ *     Nayna Jain <na...@linux.vnet.ibm.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
@@ -45,7 +46,7 @@ struct acpi_tcpa {
 };
 
 /* read binary bios log */
-int read_log(struct tpm_chip *chip)
+int read_log_acpi(struct tpm_chip *chip)
 {
        struct acpi_tcpa *buff;
        acpi_status status;
@@ -54,12 +55,6 @@ int read_log(struct tpm_chip *chip)
        struct tpm_bios_log *log;
 
        log = &chip->log;
-       if (log->bios_event_log != NULL) {
-               printk(KERN_ERR
-                      "%s: ERROR - Eventlog already initialized\n",
-                      __func__);
-               return -EFAULT;
-       }
 
        /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
        status = acpi_get_table(ACPI_SIG_TCPA, 1,
diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index bb142f2..b60c028 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -365,6 +365,24 @@ static int is_bad(void *p)
        return 0;
 }
 
+int read_log(struct tpm_chip *chip)
+{
+       int rc;
+
+       if (chip->log.bios_event_log != NULL) {
+               dev_dbg(&chip->dev, "%s: ERROR - Eventlog already 
initialized\n",
+                       __func__);
+               return -EFAULT;
+       }
+
+       rc = read_log_acpi(chip);
+       if ((rc == 0) || (rc == -ENOMEM))
+               return rc;
+       rc = read_log_of(chip);
+       return rc;
+
+}
+
 int tpm_bios_log_setup(struct tpm_chip *chip)
 {
        const char *name = dev_name(&chip->dev);
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 6df2f8e..be529ad 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -73,20 +73,24 @@ enum tcpa_pc_event_ids {
        HOST_TABLE_OF_DEVICES,
 };
 
-int read_log(struct tpm_chip *chip);
-
-#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
-       defined(CONFIG_ACPI)
-extern int tpm_bios_log_setup(struct tpm_chip *chip);
-extern void tpm_bios_log_teardown(struct tpm_chip *chip);
+#if defined(CONFIG_ACPI)
+int read_log_acpi(struct tpm_chip *chip);
 #else
-static inline int tpm_bios_log_setup(struct tpm_chip *chip)
+static inline int read_log_acpi(struct tpm_chip *chip)
 {
-       return 0;
+       return -ENODEV;
 }
-static inline void tpm_bios_log_teardown(struct tpm_chip *chip)
+#endif
+#if defined(CONFIG_OF)
+int read_log_of(struct tpm_chip *chip);
+#else
+static inline int read_log_of(struct tpm_chip *chip)
 {
+       return -ENODEV;
 }
 #endif
 
+int tpm_bios_log_setup(struct tpm_chip *chip);
+void tpm_bios_log_teardown(struct tpm_chip *chip);
+
 #endif
diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
index 68d891a..7c30752 100644
--- a/drivers/char/tpm/tpm_of.c
+++ b/drivers/char/tpm/tpm_of.c
@@ -2,6 +2,7 @@
  * Copyright 2012 IBM Corporation
  *
  * Author: Ashley Lai <ashleyd...@gmail.com>
+ *         Nayna Jain <na...@linux.vnet.ibm.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
@@ -20,7 +21,7 @@
 #include "tpm.h"
 #include "tpm_eventlog.h"
 
-int read_log(struct tpm_chip *chip)
+int read_log_of(struct tpm_chip *chip)
 {
        struct device_node *np;
        const u32 *sizep;
@@ -28,11 +29,6 @@ int read_log(struct tpm_chip *chip)
        struct tpm_bios_log *log;
 
        log = &chip->log;
-       if (log->bios_event_log != NULL) {
-               pr_err("%s: ERROR - Eventlog already initialized\n", __func__);
-               return -EFAULT;
-       }
-
        np = of_find_node_by_name(NULL, "vtpm");
        if (!np) {
                pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
-- 
2.5.0


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