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authorMatt Mackall <mpm@selenic.com>2008-04-29 12:02:56 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 19:06:24 +0400
commit88c730da8c8b20fa732221725347bd9460842bac (patch)
treef792b1a388eb4b5c74bfcda340ea207701efa5aa /drivers/char
parent90b75ee54666fe615ebcacfc8d8540b80afdedd5 (diff)
downloadlinux-88c730da8c8b20fa732221725347bd9460842bac.tar.xz
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/random.c20
1 files changed, 4 insertions, 16 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 32118598a71b..46944088cf94 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -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: