diff options
author | Herbert Xu <herbert@gondor.apana.org.au> | 2014-12-23 08:40:19 +0300 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-12-26 00:33:35 +0300 |
commit | ac3a497f13e42a99ed6fe188ebf2dcc39eb7ac20 (patch) | |
tree | 6c06a3de482d03a83d7a7c6ad8ea32f099c9530c /drivers | |
parent | 15b66cd54291186011f733cc750263f320b8a0a4 (diff) | |
download | linux-ac3a497f13e42a99ed6fe188ebf2dcc39eb7ac20.tar.xz |
hwrng: core - Do not register device opportunistically
Currently we only register the device when a valid RNG is added.
However the way it's done is buggy because we test whether there
is a current RNG to determine whether we need to register. As
the current RNG may be missing due to a reinitialisation error
this can lead to a reregistration of the device.
As the device already has to handle a NULL current RNG anyway,
let's just register the device always and remove the complexity.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/char/hw_random/core.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 42827fd5f38d..1d342f0cb0c1 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -372,14 +372,14 @@ static DEVICE_ATTR(rng_available, S_IRUGO, NULL); -static void unregister_miscdev(void) +static void __exit unregister_miscdev(void) { 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); } -static int register_miscdev(void) +static int __init register_miscdev(void) { int err; @@ -484,12 +484,6 @@ int hwrng_register(struct hwrng *rng) if (err) goto out_unlock; set_current_rng(rng); - - err = register_miscdev(); - if (err) { - drop_current_rng(); - goto out_unlock; - } } list_add_tail(&rng->list, &rng_list); @@ -530,7 +524,6 @@ void hwrng_unregister(struct hwrng *rng) if (list_empty(&rng_list)) { mutex_unlock(&rng_mutex); - unregister_miscdev(); if (hwrng_fill) kthread_stop(hwrng_fill); } else @@ -540,16 +533,24 @@ void hwrng_unregister(struct hwrng *rng) } EXPORT_SYMBOL_GPL(hwrng_unregister); -static void __exit hwrng_exit(void) +static int __init hwrng_modinit(void) +{ + return register_miscdev(); +} + +static void __exit hwrng_modexit(void) { mutex_lock(&rng_mutex); BUG_ON(current_rng); kfree(rng_buffer); kfree(rng_fillbuf); mutex_unlock(&rng_mutex); + + unregister_miscdev(); } -module_exit(hwrng_exit); +module_init(hwrng_modinit); +module_exit(hwrng_modexit); MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver"); MODULE_LICENSE("GPL"); |