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dev/random: use our roundup() macro instead of re-implementing it.

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While here also use howmany() macro from sys/param.h
No functional change.

Reviewed by:	markm (roundup replacement part)
Approved by:	so
This commit is contained in:
Pedro F. Giffuni 2016-04-25 21:14:32 +00:00
parent 820a9567ed
commit 7b250b1ec9
3 changed files with 4 additions and 7 deletions
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2
sys/dev/random/fortuna.c
View File

@ -324,7 +324,7 @@ random_fortuna_genrandom(uint8_t *buf, u_int bytecount)
* - K = GenerateBlocks(2)
*/
KASSERT((bytecount <= RANDOM_FORTUNA_MAX_READ), ("invalid single read request to Fortuna of %d bytes", bytecount));
blockcount = (bytecount + RANDOM_BLOCKSIZE - 1)/RANDOM_BLOCKSIZE;
blockcount = howmany(bytecount, RANDOM_BLOCKSIZE);
random_fortuna_genblocks(buf, blockcount);
random_fortuna_genblocks(temp, RANDOM_KEYS_PER_BLOCK);
randomdev_encrypt_init(&fortuna_state.fs_key, temp);

7
sys/dev/random/randomdev.c
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@ -68,9 +68,6 @@ static u_int READ_RANDOM(void *, u_int);
#define READ_RANDOM read_random
#endif
/* Return the largest number >= x that is a multiple of m */
#define CEIL_TO_MULTIPLE(x, m) ((((x) + (m) - 1)/(m))*(m))
static d_read_t randomdev_read;
static d_write_t randomdev_write;
static d_poll_t randomdev_poll;
@ -164,7 +161,7 @@ READ_RANDOM_UIO(struct uio *uio, bool nonblock)
* which is what the underlying generator is expecting.
* See the random_buf size requirements in the Yarrow/Fortuna code.
*/
read_len = CEIL_TO_MULTIPLE(read_len, RANDOM_BLOCKSIZE);
read_len = roundup(read_len, RANDOM_BLOCKSIZE);
/* Work in chunks page-sized or less */
read_len = MIN(read_len, PAGE_SIZE);
p_random_alg_context->ra_read(random_buf, read_len);
@ -204,7 +201,7 @@ READ_RANDOM(void *random_buf, u_int len)
* Round up the read length to a crypto block size multiple,
* which is what the underlying generator is expecting.
*/
read_len = CEIL_TO_MULTIPLE(len, RANDOM_BLOCKSIZE);
read_len = roundup(len, RANDOM_BLOCKSIZE);
p_random_alg_context->ra_read(local_buf, read_len);
memcpy(random_buf, local_buf, len);
}

2
sys/dev/random/yarrow.c
View File

@ -374,7 +374,7 @@ random_yarrow_read(uint8_t *buf, u_int bytecount)
KASSERT((bytecount % RANDOM_BLOCKSIZE) == 0, ("%s(): bytecount (= %d) must be a multiple of %d", __func__, bytecount, RANDOM_BLOCKSIZE ));
RANDOM_RESEED_LOCK();
blockcount = (bytecount + RANDOM_BLOCKSIZE - 1)/RANDOM_BLOCKSIZE;
blockcount = howmany(bytecount, RANDOM_BLOCKSIZE);
for (i = 0; i < blockcount; i++) {
if (yarrow_state.ys_outputblocks++ >= yarrow_state.ys_gengateinterval) {
random_yarrow_generator_gate();