From a41e3dc4060cca2599afa14fbd4c745763746ba8 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 4 Feb 2008 22:30:13 -0800 Subject: [PATCH] HWRNG: add possibility to remove hwrng devices during suspend/resume Make it possible to unregister a Hardware Random Number Generator device object in a safe way during a suspend/resume cycle. Signed-off-by: Rafael J. Wysocki Acked-by: Michael Buesch Cc: Michael Buesch Cc: Pavel Machek Cc: "John W. Linville" Cc: Alan Stern Cc: Len Brown Cc: Greg KH Cc: Kay Sievers Cc: Richard Purdie Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/hw_random/core.c | 10 +++++----- include/linux/hw_random.h | 10 +++++++++- 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 0118b9817a..84cdf90257 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -234,11 +234,11 @@ static DEVICE_ATTR(rng_available, S_IRUGO, NULL); -static void unregister_miscdev(void) +static void unregister_miscdev(bool suspended) { device_remove_file(rng_miscdev.this_device, &dev_attr_rng_available); device_remove_file(rng_miscdev.this_device, &dev_attr_rng_current); - misc_deregister(&rng_miscdev); + __misc_deregister(&rng_miscdev, suspended); } static int register_miscdev(void) @@ -313,7 +313,7 @@ out: } EXPORT_SYMBOL_GPL(hwrng_register); -void hwrng_unregister(struct hwrng *rng) +void __hwrng_unregister(struct hwrng *rng, bool suspended) { int err; @@ -332,11 +332,11 @@ void hwrng_unregister(struct hwrng *rng) } } if (list_empty(&rng_list)) - unregister_miscdev(); + unregister_miscdev(suspended); mutex_unlock(&rng_mutex); } -EXPORT_SYMBOL_GPL(hwrng_unregister); +EXPORT_SYMBOL_GPL(__hwrng_unregister); MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver"); diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h index 85d11916e9..42131820bb 100644 --- a/include/linux/hw_random.h +++ b/include/linux/hw_random.h @@ -44,7 +44,15 @@ struct hwrng { /** Register a new Hardware Random Number Generator driver. */ extern int hwrng_register(struct hwrng *rng); /** Unregister a Hardware Random Number Generator driver. */ -extern void hwrng_unregister(struct hwrng *rng); +extern void __hwrng_unregister(struct hwrng *rng, bool suspended); +static inline void hwrng_unregister(struct hwrng *rng) +{ + __hwrng_unregister(rng, false); +} +static inline void hwrng_unregister_suspended(struct hwrng *rng) +{ + __hwrng_unregister(rng, true); +} #endif /* __KERNEL__ */ #endif /* LINUX_HWRANDOM_H_ */ -- 2.39.5