random: remove rand_initialize_irq()

commit c5857ccf293968348e5eb4ebedc68074de3dcda6 upstream.

With the new interrupt sampling system, we are no longer using the
timer_rand_state structure in the irq descriptor, so we can stop
initializing it now.

[ Merged in fixes from Sedat to find some last missing references to
  rand_initialize_irq() ]

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 0 insertions, 60 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index e70701ec3b0..5df09b014ea 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -634,43 +634,6 @@ struct timer_rand_state {
         unsigned dont_count_entropy:1;
 };
 
-#ifndef CONFIG_GENERIC_HARDIRQS
-
-static struct timer_rand_state *irq_timer_state[NR_IRQS];
-
-static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
-{
-        return irq_timer_state[irq];
-}
-
-static void set_timer_rand_state(unsigned int irq,
-                                 struct timer_rand_state *state)
-{
-        irq_timer_state[irq] = state;
-}
-
-#else
-
-static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
-{
-        struct irq_desc *desc;
-
-        desc = irq_to_desc(irq);
-
-        return desc->timer_rand_state;
-}
-
-static void set_timer_rand_state(unsigned int irq,
-                                 struct timer_rand_state *state)
-{
-        struct irq_desc *desc;
-
-        desc = irq_to_desc(irq);
-
-        desc->timer_rand_state = state;
-}
-#endif
-
 /*
  * Add device- or boot-specific data to the input and nonblocking
  * pools to help initialize them to unique values.
@@ -1133,24 +1096,6 @@ static int rand_initialize(void)
 }
 module_init(rand_initialize);
 
-void rand_initialize_irq(int irq)
-{
-        struct timer_rand_state *state;
-
-        state = get_timer_rand_state(irq);
-
-        if (state)
-                return;
-
-        /*
-         * If kzalloc returns null, we just won't use that entropy
-         * source.
-         */
-        state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL);
-        if (state)
-                set_timer_rand_state(irq, state);
-}
-
 #ifdef CONFIG_BLOCK
 void rand_initialize_disk(struct gendisk *disk)
 {
diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
index c0befd3ad98..ccd81b1540a 100644
--- a/drivers/mfd/ab3100-core.c
+++ b/drivers/mfd/ab3100-core.c
@@ -936,9 +936,6 @@ static int __devinit ab3100_probe(struct i2c_client *client,
 
         err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
                                 IRQF_ONESHOT, "ab3100-core", ab3100);
-        /* This real unpredictable IRQ is of course sampled for entropy */
-        rand_initialize_irq(client->irq);
-
         if (err)
                 goto exit_no_irq;
 
diff --git a/drivers/mfd/ab3550-core.c b/drivers/mfd/ab3550-core.c
index 3d7dce671b9..d69dc4bf8bb 100644
--- a/drivers/mfd/ab3550-core.c
+++ b/drivers/mfd/ab3550-core.c
@@ -1309,8 +1309,6 @@ static int __init ab3550_probe(struct i2c_client *client,
 
         err = request_threaded_irq(client->irq, NULL, ab3550_irq_handler,
                 IRQF_ONESHOT, "ab3550-core", ab);
-        /* This real unpredictable IRQ is of course sampled for entropy */
-        rand_initialize_irq(client->irq);
 
         if (err)
                 goto exit_no_irq;