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random: fix comment on "account" 

This comment didn't quite keep up as extract_entropy() was split into
four functions.  Put each bit by the function it describes.

Signed-off-by: Greg Price <price@mit.edu>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Greg Price 2013-11-29 15:50:06 -05:00 committed by Theodore Ts'o
parent 12ff3a517a
commit 19fa5be1d9
1 changed files with 21 additions and 10 deletions
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31
drivers/char/random.c
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@ -958,17 +958,9 @@ static void push_to_pool(struct work_struct *work)
}
/*
* These functions extracts randomness from the "entropy pool", and
* returns it in a buffer.
*
* The min parameter specifies the minimum amount we can pull before
* failing to avoid races that defeat catastrophic reseeding while the
* reserved parameter indicates how much entropy we must leave in the
* pool after each pull to avoid starving other readers.
*
* Note: extract_entropy() assumes that .poolwords is a multiple of 16 words.
* This function decides how many bytes to actually take from the
* given pool, and also debits the entropy count accordingly.
*/
static size_t account(struct entropy_store *r, size_t nbytes, int min,
int reserved)
{
@ -1018,6 +1010,12 @@ retry:
return ibytes;
}
/*
* This function does the actual extraction for extract_entropy and
* extract_entropy_user.
*
* Note: we assume that .poolwords is a multiple of 16 words.
*/
static void extract_buf(struct entropy_store *r, __u8 *out)
{
int i;
@ -1079,6 +1077,15 @@ static void extract_buf(struct entropy_store *r, __u8 *out)
memset(&hash, 0, sizeof(hash));
}
/*
* This function extracts randomness from the "entropy pool", and
* returns it in a buffer.
*
* The min parameter specifies the minimum amount we can pull before
* failing to avoid races that defeat catastrophic reseeding while the
* reserved parameter indicates how much entropy we must leave in the
* pool after each pull to avoid starving other readers.
*/
static ssize_t extract_entropy(struct entropy_store *r, void *buf,
size_t nbytes, int min, int reserved)
{
@ -1129,6 +1136,10 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
return ret;
}
/*
* This function extracts randomness from the "entropy pool", and
* returns it in a userspace buffer.
*/
static ssize_t extract_entropy_user(struct entropy_store *r, void __user *buf,
size_t nbytes)
{