From 09e12f9f6bcd9af516d901223cebdbae58b32c9f Mon Sep 17 00:00:00 2001 From: Kylene Jo Hall Date: Sun, 13 Nov 2005 16:07:43 -0800 Subject: [PATCH] [PATCH] tpm: locking fix Use schedule_work() to avoid down()-in-timer-handler problem. Signed-off-by: Kylene Hall Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/tpm/tpm.c | 9 +++++++++ drivers/char/tpm/tpm.h | 1 + 2 files changed, 10 insertions(+) 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; -- 2.20.1