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tpm: Fix cancellation of TPM commands (interrupt mode)

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Support cancellation of TPM commands when driver is used in interrupt
mode.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
This commit is contained in:
Stefan Berger 2013-01-22 13:57:53 -06:00 committed by Kent Yoder
parent 1f86605729
commit 78f09cc248
3 changed files with 31 additions and 12 deletions
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29
drivers/char/tpm/tpm.c
View File

@ -1102,12 +1102,28 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
}
EXPORT_SYMBOL_GPL(tpm_store_cancel);
static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, bool check_cancel,
bool *canceled)
{
u8 status = chip->vendor.status(chip);
*canceled = false;
if ((status & mask) == mask)
return true;
if (check_cancel && chip->vendor.req_canceled(chip, status)) {
*canceled = true;
return true;
}
return false;
}
int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
wait_queue_head_t *queue)
wait_queue_head_t *queue, bool check_cancel)
{
unsigned long stop;
long rc;
u8 status;
bool canceled = false;
/* check current status */
status = chip->vendor.status(chip);
@ -1122,11 +1138,14 @@ again:
if ((long)timeout <= 0)
return -ETIME;
rc = wait_event_interruptible_timeout(*queue,
((chip->vendor.status(chip)
& mask) == mask),
timeout);
if (rc > 0)
wait_for_tpm_stat_cond(chip, mask, check_cancel,
&canceled),
timeout);
if (rc > 0) {
if (canceled)
return -ECANCELED;
return 0;
}
if (rc == -ERESTARTSYS && freezing(current)) {
clear_thread_flag(TIF_SIGPENDING);
goto again;

2
drivers/char/tpm/tpm.h
View File

@ -338,7 +338,7 @@ extern void tpm_remove_hardware(struct device *);
extern int tpm_pm_suspend(struct device *);
extern int tpm_pm_resume(struct device *);
extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
wait_queue_head_t *);
wait_queue_head_t *, bool);
#ifdef CONFIG_ACPI
extern int tpm_add_ppi(struct kobject *);

12
drivers/char/tpm/tpm_tis.c
View File

@ -198,7 +198,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
wait_for_tpm_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
&chip->vendor.read_queue)
&chip->vendor.read_queue, true)
== 0) {
burstcnt = get_burstcount(chip);
for (; burstcnt > 0 && size < count; burstcnt--)
@ -241,7 +241,7 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (status & TPM_STS_DATA_AVAIL) { /* retry? */
dev_err(chip->dev, "Error left over data\n");
@ -277,7 +277,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
tpm_tis_ready(chip);
if (wait_for_tpm_stat
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
&chip->vendor.int_queue) < 0) {
&chip->vendor.int_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}
@ -292,7 +292,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
}
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
@ -304,7 +304,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
iowrite8(buf[count],
chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
&chip->vendor.int_queue, false);
status = tpm_tis_status(chip);
if ((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
@ -342,7 +342,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (wait_for_tpm_stat
(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm_calc_ordinal_duration(chip, ordinal),
&chip->vendor.read_queue) < 0) {
&chip->vendor.read_queue, false) < 0) {
rc = -ETIME;
goto out_err;
}