The patch titled
tpm: fix sleep-in-spinlock
has been added to the -mm tree. Its filename is
sleep-during-spinlock-in-tpm-driver.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: tpm: fix sleep-in-spinlock
From: Parag Warudkar <pwarudkar@xxxxxxx>
flush_scheduled_work() can sleep, and we're calling it under spinlock.
AFAICS, moving flush_scheduled_work before spin_lock() should not cause any
problems.
Reason being - The only thing that can race against tpm_release is tpm_open
(tpm_release is called when last reference to the file is closed and only
thing that can happen after that is tpm_open??) and tpm_open acquires
driver_lock and more over it bails out with EBUSY if chip->num_opens is
greater than 0.
I also moved chip->num_pending-- to after deleting timer and setting data
pending as it looks more correct for the paranoid although it probably doesn't
matter as it is guarded by driver_lock. None the less this change should not
cause problems.
While I was at it I noticed a missing NULL check in tpm_register_hardware
which is fixed with this patch as well.
Signed-off-by: Parag Warudkar <parag.warudkar@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff -puN drivers/char/tpm/tpm.c~sleep-during-spinlock-in-tpm-driver drivers/char/tpm/tpm.c
--- a/drivers/char/tpm/tpm.c~sleep-during-spinlock-in-tpm-driver
+++ a/drivers/char/tpm/tpm.c
@@ -942,12 +942,12 @@ int tpm_release(struct inode *inode, str
{
struct tpm_chip *chip = file->private_data;
+ flush_scheduled_work();
spin_lock(&driver_lock);
file->private_data = NULL;
- chip->num_opens--;
del_singleshot_timer_sync(&chip->user_read_timer);
- flush_scheduled_work();
atomic_set(&chip->data_pending, 0);
+ chip->num_opens--;
put_device(chip->dev);
kfree(chip->data_buffer);
spin_unlock(&driver_lock);
@@ -1097,8 +1097,13 @@ struct tpm_chip *tpm_register_hardware(s
/* Driver specific per-device data */
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
- if (chip == NULL)
+ devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
+
+ if (chip == NULL || devname == NULL) {
+ kfree(chip);
+ kfree(devname);
return NULL;
+ }
init_MUTEX(&chip->buffer_mutex);
init_MUTEX(&chip->tpm_mutex);
@@ -1124,7 +1129,6 @@ struct tpm_chip *tpm_register_hardware(s
set_bit(chip->dev_num, dev_mask);
- devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
chip->vendor.miscdev.name = devname;
_
Patches currently in -mm which might be from pwarudkar@xxxxxxx are
sleep-during-spinlock-in-tpm-driver.patch
-
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