In core rng_buffer and rng_fillbuf is allocated in hwrng_register only once and it is freed during module exit. This patch moves allocating rng_buffer and rng_fillbuf from hwrng_register to rng core's init. This avoids checking whether rng_buffer and rng_fillbuf was allocated from every hwrng_register call. Also moving them to module init makes it explicit that it is freed in module exit. Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx> --- drivers/char/hw_random/core.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 9203f2d..ec6846b 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -449,22 +449,6 @@ int hwrng_register(struct hwrng *rng) goto out; mutex_lock(&rng_mutex); - - /* kmalloc makes this safe for virt_to_page() in virtio_rng.c */ - err = -ENOMEM; - if (!rng_buffer) { - rng_buffer = kmalloc(rng_buffer_size(), GFP_KERNEL); - if (!rng_buffer) - goto out_unlock; - } - if (!rng_fillbuf) { - rng_fillbuf = kmalloc(rng_buffer_size(), GFP_KERNEL); - if (!rng_fillbuf) { - kfree(rng_buffer); - goto out_unlock; - } - } - /* Must not register two RNGs with the same name. */ err = -EEXIST; list_for_each_entry(tmp, &rng_list, list) { @@ -573,6 +557,17 @@ EXPORT_SYMBOL_GPL(devm_hwrng_unregister); static int __init hwrng_modinit(void) { + /* kmalloc makes this safe for virt_to_page() in virtio_rng.c */ + rng_buffer = kmalloc(rng_buffer_size(), GFP_KERNEL); + if (!rng_buffer) + return -ENOMEM; + + rng_fillbuf = kmalloc(rng_buffer_size(), GFP_KERNEL); + if (!rng_fillbuf) { + kfree(rng_buffer); + return -ENOMEM; + } + return register_miscdev(); } -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html