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[PATCH] tpm: use clear_bit 

Use set_bit() and clear_bit() for dev_mask manipulation.

Signed-off-by: Kylie Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kylene Jo Hall 2006-04-22 02:38:32 -07:00 committed by Linus Torvalds
parent 36b20020e5
commit 10685a9530
1 changed files with 7 additions and 18 deletions
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25
drivers/char/tpm/tpm.c
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@ -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;
}