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Subject[PATCH v2 1/2] tpm: Use managed allocation for bios event log
Date
Since the bios event log is freed in the device release function,
let devres handle the deallocation. This will allow other memory
allocation/mapping functions to be used for the bios event log.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
drivers/char/tpm/eventlog/acpi.c | 5 +++--
drivers/char/tpm/eventlog/efi.c | 13 +++++++------
drivers/char/tpm/eventlog/of.c | 3 ++-
drivers/char/tpm/tpm-chip.c | 1 -
4 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
index 0913d3eb8d51..40360e599bc3 100644
--- a/drivers/char/tpm/eventlog/acpi.c
+++ b/drivers/char/tpm/eventlog/acpi.c
@@ -14,6 +14,7 @@
* Access to the event log extended by the TCG BIOS of PC platform
*/

+#include <linux/device.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/security.h>
@@ -135,7 +136,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
}

/* malloc EventLog space */
- log->bios_event_log = kmalloc(len, GFP_KERNEL);
+ log->bios_event_log = devm_kmalloc(&chip->dev, len, GFP_KERNEL);
if (!log->bios_event_log)
return -ENOMEM;

@@ -160,7 +161,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
return format;

err:
- kfree(log->bios_event_log);
+ devm_kfree(&chip->dev, log->bios_event_log);
log->bios_event_log = NULL;
return ret;
}
diff --git a/drivers/char/tpm/eventlog/efi.c b/drivers/char/tpm/eventlog/efi.c
index e6cb9d525e30..4e9d7c2bf32e 100644
--- a/drivers/char/tpm/eventlog/efi.c
+++ b/drivers/char/tpm/eventlog/efi.c
@@ -6,6 +6,7 @@
* Thiebaud Weksteen <tweek@google.com>
*/

+#include <linux/device.h>
#include <linux/efi.h>
#include <linux/tpm_eventlog.h>

@@ -55,7 +56,7 @@ int tpm_read_log_efi(struct tpm_chip *chip)
}

/* malloc EventLog space */
- log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
+ log->bios_event_log = devm_kmemdup(&chip->dev, log_tbl->log, log_size, GFP_KERNEL);
if (!log->bios_event_log) {
ret = -ENOMEM;
goto out;
@@ -76,7 +77,7 @@ int tpm_read_log_efi(struct tpm_chip *chip)
MEMREMAP_WB);
if (!final_tbl) {
pr_err("Could not map UEFI TPM final log\n");
- kfree(log->bios_event_log);
+ devm_kfree(&chip->dev, log->bios_event_log);
ret = -ENOMEM;
goto out;
}
@@ -91,11 +92,11 @@ int tpm_read_log_efi(struct tpm_chip *chip)
* Allocate memory for the 'combined log' where we will append the
* 'final events log' to.
*/
- tmp = krealloc(log->bios_event_log,
- log_size + final_events_log_size,
- GFP_KERNEL);
+ tmp = devm_krealloc(&chip->dev, log->bios_event_log,
+ log_size + final_events_log_size,
+ GFP_KERNEL);
if (!tmp) {
- kfree(log->bios_event_log);
+ devm_kfree(&chip->dev, log->bios_event_log);
ret = -ENOMEM;
goto out;
}
diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c
index a9ce66d09a75..741ab2204b11 100644
--- a/drivers/char/tpm/eventlog/of.c
+++ b/drivers/char/tpm/eventlog/of.c
@@ -10,6 +10,7 @@
* Read the event log created by the firmware on PPC64
*/

+#include <linux/device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/tpm_eventlog.h>
@@ -65,7 +66,7 @@ int tpm_read_log_of(struct tpm_chip *chip)
return -EIO;
}

- log->bios_event_log = kmemdup(__va(base), size, GFP_KERNEL);
+ log->bios_event_log = devm_kmemdup(&chip->dev, __va(base), size, GFP_KERNEL);
if (!log->bios_event_log)
return -ENOMEM;

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 741d8f3e8fb3..b99f55f2d4fd 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -267,7 +267,6 @@ static void tpm_dev_release(struct device *dev)
idr_remove(&dev_nums_idr, chip->dev_num);
mutex_unlock(&idr_lock);

- kfree(chip->log.bios_event_log);
kfree(chip->work_space.context_buf);
kfree(chip->work_space.session_buf);
kfree(chip->allocated_banks);
--
2.31.1
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