diff options
| -rw-r--r-- | drivers/char/tpm/tpm.c | 25 |
1 files changed, 7 insertions, 18 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 160dc080d58..6889e7db3af 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -32,7 +32,6 @@ enum tpm_const { TPM_MINOR = 224, /* officially assigned */ TPM_BUFSIZE = 2048, TPM_NUM_DEVICES = 256, - TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int)) }; enum tpm_duration { @@ -48,7 +47,7 @@ enum tpm_duration { static LIST_HEAD(tpm_chip_list); static DEFINE_SPINLOCK(driver_lock); -static int dev_mask[TPM_NUM_MASK_ENTRIES]; +static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); /* * Array with one entry per ordinal defining the maximum amount @@ -1038,8 +1037,7 @@ void tpm_remove_hardware(struct device *dev) sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); tpm_bios_log_teardown(chip->bios_dir); - dev_mask[chip->dev_num / TPM_NUM_MASK_ENTRIES] &= - ~(1 << (chip->dev_num % TPM_NUM_MASK_ENTRIES)); + clear_bit(chip->dev_num, dev_mask); kfree(chip); @@ -1097,7 +1095,6 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend char *devname; struct tpm_chip *chip; - int i, j; /* Driver specific per-device data */ chip = kzalloc(sizeof(*chip), GFP_KERNEL); @@ -1116,19 +1113,9 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); - chip->dev_num = -1; + chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); - for (i = 0; i < TPM_NUM_MASK_ENTRIES; i++) - for (j = 0; j < 8 * sizeof(int); j++) - if ((dev_mask[i] & (1 << j)) == 0) { - chip->dev_num = - i * TPM_NUM_MASK_ENTRIES + j; - dev_mask[i] |= 1 << j; - goto dev_num_search_complete; - } - -dev_num_search_complete: - if (chip->dev_num < 0) { + if (chip->dev_num >= TPM_NUM_DEVICES) { dev_err(dev, "No available tpm device numbers\n"); kfree(chip); return NULL; @@ -1137,6 +1124,8 @@ dev_num_search_complete: else chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; + 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; @@ -1150,8 +1139,8 @@ dev_num_search_complete: chip->vendor.miscdev.name, chip->vendor.miscdev.minor); put_device(dev); + clear_bit(chip->dev_num, dev_mask); kfree(chip); - dev_mask[i] &= !(1 << j); return NULL; } |