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| author | Kylene Jo Hall <kjhall@us.ibm.com> | 2005-11-13 16:07:43 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-13 18:14:17 -0800 |
| commit | 09e12f9f6bcd9af516d901223cebdbae58b32c9f (patch) | |
| tree | e6f56aea2eb1b3aefe483475291580d862fb00e7 /drivers/char | |
| parent | f6a2382cec3ed9b67b01febfa85d7d72b254844a (diff) | |
| download | linux-3.10-09e12f9f6bcd9af516d901223cebdbae58b32c9f.tar.gz linux-3.10-09e12f9f6bcd9af516d901223cebdbae58b32c9f.tar.bz2 linux-3.10-09e12f9f6bcd9af516d901223cebdbae58b32c9f.zip | |
[PATCH] tpm: locking fix
Use schedule_work() to avoid down()-in-timer-handler problem.
Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 9 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 1 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 1a53da99b58..0b283d24673 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -43,6 +43,13 @@ static void user_reader_timeout(unsigned long ptr) { struct tpm_chip *chip = (struct tpm_chip *) ptr; + schedule_work(&chip->work); +} + +static void timeout_work(void * ptr) +{ + struct tpm_chip *chip = ptr; + down(&chip->buffer_mutex); atomic_set(&chip->data_pending, 0); memset(chip->data_buffer, 0, TPM_BUFSIZE); @@ -527,6 +534,8 @@ int tpm_register_hardware(struct device *dev, struct tpm_vendor_specific *entry) init_MUTEX(&chip->tpm_mutex); INIT_LIST_HEAD(&chip->list); + INIT_WORK(&chip->work, timeout_work, chip); + init_timer(&chip->user_read_timer); chip->user_read_timer.function = user_reader_timeout; chip->user_read_timer.data = (unsigned long) chip; diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index ad51c653803..159882ca69d 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -77,6 +77,7 @@ struct tpm_chip { struct semaphore buffer_mutex; struct timer_list user_read_timer; /* user needs to claim result */ + struct work_struct work; struct semaphore tpm_mutex; /* tpm is processing */ struct tpm_vendor_specific *vendor; |