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| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-04-08 21:36:54 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2013-04-08 21:36:54 +0200 |
| commit | 0b824f8dad9fdfc7c1bf9c1d3ac744075eb73ec6 (patch) | |
| tree | 7559859702f2fa02f6a4db64cf10f6c2e3f80c21 /drivers/char/hw_random | |
| parent | 6dbe51c251a327e012439c4772097a13df43c5b8 (diff) | |
| parent | 3d5a96582303e28c48699f3faaf920ef7d43e6f2 (diff) | |
| download | olio-linux-3.10-0b824f8dad9fdfc7c1bf9c1d3ac744075eb73ec6.tar.xz olio-linux-3.10-0b824f8dad9fdfc7c1bf9c1d3ac744075eb73ec6.zip | |
Merge remote-tracking branch 'arm-soc/clksrc/cleanup' into sunxi/core-for-3.10
Diffstat (limited to 'drivers/char/hw_random')
| -rw-r--r-- | drivers/char/hw_random/core.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index 1bafb40ec8a..69ae5972713 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -40,6 +40,7 @@ #include <linux/init.h> #include <linux/miscdevice.h> #include <linux/delay.h> +#include <linux/slab.h> #include <asm/uaccess.h> @@ -52,8 +53,12 @@ static struct hwrng *current_rng; static LIST_HEAD(rng_list); static DEFINE_MUTEX(rng_mutex); static int data_avail; -static u8 rng_buffer[SMP_CACHE_BYTES < 32 ? 32 : SMP_CACHE_BYTES] - __cacheline_aligned; +static u8 *rng_buffer; + +static size_t rng_buffer_size(void) +{ + return SMP_CACHE_BYTES < 32 ? 32 : SMP_CACHE_BYTES; +} static inline int hwrng_init(struct hwrng *rng) { @@ -116,7 +121,7 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf, if (!data_avail) { bytes_read = rng_get_data(current_rng, rng_buffer, - sizeof(rng_buffer), + rng_buffer_size(), !(filp->f_flags & O_NONBLOCK)); if (bytes_read < 0) { err = bytes_read; @@ -307,6 +312,14 @@ int hwrng_register(struct hwrng *rng) 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; + } + /* Must not register two RNGs with the same name. */ err = -EEXIST; list_for_each_entry(tmp, &rng_list, list) { |