hwrng: omap3-rom - convert timer to delayed work

We cannot put the HW RNG to idle using a timer because we cannot disable
clocks from atomic context. Use a delayed work instead.

Fixes a warning with CONFIG_DEBUG_MUTEXES on Nokia N900 during boot.

Reported-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/char/hw_random/omap3-rom-rng.c b/drivers/char/hw_random/omap3-rom-rng.c
index a405cdcd8dd2..8da14f1a1f56 100644
--- a/drivers/char/hw_random/omap3-rom-rng.c
+++ b/drivers/char/hw_random/omap3-rom-rng.c
@@ -17,7 +17,7 @@
 #include <linux/init.h>
 #include <linux/random.h>
 #include <linux/hw_random.h>
-#include <linux/timer.h>
+#include <linux/workqueue.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
@@ -29,11 +29,11 @@
 /* param1: ptr, param2: count, param3: flag */
 static u32 (*omap3_rom_rng_call)(u32, u32, u32);
 
-static struct timer_list idle_timer;
+static struct delayed_work idle_work;
 static int rng_idle;
 static struct clk *rng_clk;
 
-static void omap3_rom_rng_idle(unsigned long data)
+static void omap3_rom_rng_idle(struct work_struct *work)
 {
         int r;
 
@@ -51,7 +51,7 @@ static int omap3_rom_rng_get_random(void *buf, unsigned int count)
         u32 r;
         u32 ptr;
 
-        del_timer_sync(&idle_timer);
+        cancel_delayed_work_sync(&idle_work);
         if (rng_idle) {
                 clk_prepare_enable(rng_clk);
                 r = omap3_rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
@@ -65,7 +65,7 @@ static int omap3_rom_rng_get_random(void *buf, unsigned int count)
 
         ptr = virt_to_phys(buf);
         r = omap3_rom_rng_call(ptr, count, RNG_GEN_HW);
-        mod_timer(&idle_timer, jiffies + msecs_to_jiffies(500));
+        schedule_delayed_work(&idle_work, msecs_to_jiffies(500));
         if (r != 0)
                 return -EINVAL;
         return 0;
@@ -102,7 +102,7 @@ static int omap3_rom_rng_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
-        setup_timer(&idle_timer, omap3_rom_rng_idle, 0);
+        INIT_DELAYED_WORK(&idle_work, omap3_rom_rng_idle);
         rng_clk = devm_clk_get(&pdev->dev, "ick");
         if (IS_ERR(rng_clk)) {
                 pr_err("unable to get RNG clock\n");
@@ -118,6 +118,7 @@ static int omap3_rom_rng_probe(struct platform_device *pdev)
 
 static int omap3_rom_rng_remove(struct platform_device *pdev)
 {
+        cancel_delayed_work_sync(&idle_work);
         hwrng_unregister(&omap3_rom_rng_ops);
         clk_disable_unprepare(rng_clk);
         return 0;