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random: consolidate wakeup logic 

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matt Mackall 2008-04-29 01:02:56 -07:00 committed by Linus Torvalds
parent 90b75ee546
commit 88c730da8c
1 changed files with 4 additions and 16 deletions
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20
drivers/char/random.c
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@ -540,6 +540,10 @@ static void credit_entropy_store(struct entropy_store *r, int nbits)
nbits, r->name);
}
/* should we wake readers? */
if (r == &input_pool && r->entropy_count >= random_read_wakeup_thresh)
wake_up_interruptible(&random_read_wait);
spin_unlock_irqrestore(&r->lock, flags);
}
@ -624,10 +628,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num)
credit_entropy_store(&input_pool,
min_t(int, fls(delta>>1), 11));
}
if (input_pool.entropy_count >= random_read_wakeup_thresh)
wake_up_interruptible(&random_read_wait);
out:
preempt_enable();
}
@ -1081,12 +1081,6 @@ static int random_ioctl(struct inode *inode, struct file *file,
if (get_user(ent_count, p))
return -EFAULT;
credit_entropy_store(&input_pool, ent_count);
/*
* Wake up waiting processes if we have enough
* entropy.
*/
if (input_pool.entropy_count >= random_read_wakeup_thresh)
wake_up_interruptible(&random_read_wait);
return 0;
case RNDADDENTROPY:
if (!capable(CAP_SYS_ADMIN))
@ -1102,12 +1096,6 @@ static int random_ioctl(struct inode *inode, struct file *file,
if (retval < 0)
return retval;
credit_entropy_store(&input_pool, ent_count);
/*
* Wake up waiting processes if we have enough
* entropy.
*/
if (input_pool.entropy_count >= random_read_wakeup_thresh)
wake_up_interruptible(&random_read_wait);
return 0;
case RNDZAPENTCNT:
case RNDCLEARPOOL: