diff options
Diffstat (limited to 'drivers/char/tpm/tpm.c')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index f26afdb1a70..93211df52aa 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -1182,17 +1182,20 @@ ssize_t tpm_write(struct file *file, const char __user *buf, size_t size, loff_t *off) { struct tpm_chip *chip = file->private_data; - size_t in_size = size, out_size; + size_t in_size = size; + ssize_t out_size; /* cannot perform a write until the read has cleared - either via tpm_read or a user_read_timer timeout */ - while (atomic_read(&chip->data_pending) != 0) - msleep(TPM_TIMEOUT); - - mutex_lock(&chip->buffer_mutex); + either via tpm_read or a user_read_timer timeout. + This also prevents splitted buffered writes from blocking here. + */ + if (atomic_read(&chip->data_pending) != 0) + return -EBUSY; if (in_size > TPM_BUFSIZE) - in_size = TPM_BUFSIZE; + return -E2BIG; + + mutex_lock(&chip->buffer_mutex); if (copy_from_user (chip->data_buffer, (void __user *) buf, in_size)) { @@ -1202,6 +1205,10 @@ ssize_t tpm_write(struct file *file, const char __user *buf, /* atomic tpm command send and result receive */ out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); + if (out_size < 0) { + mutex_unlock(&chip->buffer_mutex); + return out_size; + } atomic_set(&chip->data_pending, out_size); mutex_unlock(&chip->buffer_mutex); @@ -1259,6 +1266,7 @@ void tpm_remove_hardware(struct device *dev) misc_deregister(&chip->vendor.miscdev); sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); + tpm_remove_ppi(&dev->kobj); tpm_bios_log_teardown(chip->bios_dir); /* write it this way to be explicit (chip->dev == dev) */ @@ -1476,7 +1484,7 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, goto put_device; } - if (sys_add_ppi(&dev->kobj)) { + if (tpm_add_ppi(&dev->kobj)) { misc_deregister(&chip->vendor.miscdev); goto put_device; } |