block: don't depend on consecutive minor space

[safe/jmp/linux-2.6] / drivers / char / random.c

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0cf98bd..6af435b 100644 (file)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -236,6 +236,7 @@
 #include <linux/fs.h>
 #include <linux/genhd.h>
 #include <linux/interrupt.h>
+#include <linux/mm.h>
 #include <linux/spinlock.h>
 #include <linux/percpu.h>
 #include <linux/cryptohash.h>
@@ -406,7 +407,7 @@ struct entropy_store {
        /* read-write data: */
        spinlock_t lock;
        unsigned add_ptr;
-       int entropy_count;
+       int entropy_count;      /* Must at no time exceed ->POOLBITS! */
        int input_rotate;
 };
 
@@ -519,6 +520,7 @@ static void mix_pool_bytes(struct entropy_store *r, const void *in, int bytes)
 static void credit_entropy_bits(struct entropy_store *r, int nbits)
 {
        unsigned long flags;
+       int entropy_count;
 
        if (!nbits)
                return;
@@ -526,20 +528,20 @@ static void credit_entropy_bits(struct entropy_store *r, int nbits)
        spin_lock_irqsave(&r->lock, flags);
 
        DEBUG_ENT("added %d entropy credits to %s\n", nbits, r->name);
-       r->entropy_count += nbits;
-       if (r->entropy_count < 0) {
+       entropy_count = r->entropy_count;
+       entropy_count += nbits;
+       if (entropy_count < 0) {
                DEBUG_ENT("negative entropy/overflow\n");
-               r->entropy_count = 0;
-       } else if (r->entropy_count > r->poolinfo->POOLBITS)
-               r->entropy_count = r->poolinfo->POOLBITS;
+               entropy_count = 0;
+       } else if (entropy_count > r->poolinfo->POOLBITS)
+               entropy_count = r->poolinfo->POOLBITS;
+       r->entropy_count = entropy_count;
 
        /* should we wake readers? */
-       if (r == &input_pool &&
-           r->entropy_count >= random_read_wakeup_thresh) {
+       if (r == &input_pool && entropy_count >= random_read_wakeup_thresh) {
                wake_up_interruptible(&random_read_wait);
                kill_fasync(&fasync, SIGIO, POLL_IN);
        }
-
        spin_unlock_irqrestore(&r->lock, flags);
 }
 
@@ -659,10 +661,10 @@ void add_disk_randomness(struct gendisk *disk)
        if (!disk || !disk->random)
                return;
        /* first major is 1, so we get >= 0x200 here */
-       DEBUG_ENT("disk event %d:%d\n", disk->major, disk->first_minor);
+       DEBUG_ENT("disk event %d:%d\n",
+                 MAJOR(disk_devt(disk)), MINOR(disk_devt(disk)));
 
-       add_timer_randomness(disk->random,
-                            0x100 + MKDEV(disk->major, disk->first_minor));
+       add_timer_randomness(disk->random, 0x100 + disk_devt(disk));
 }
 #endif
 
@@ -1570,6 +1572,7 @@ u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport)
 
        return half_md4_transform(hash, keyptr->secret);
 }
+EXPORT_SYMBOL_GPL(secure_ipv4_port_ephemeral);
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,