hwrng: place mutex around read functions and buffers.

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There's currently a big lock around everything, and it means that we
can't query sysfs (eg /sys/devices/virtual/misc/hw_random/rng_current)
while the rng is reading.  This is a real problem when the rng is slow,
or blocked (eg. virtio_rng with qemu's default /dev/random backend)

This doesn't help (it leaves the current lock untouched), just adds a
lock to protect the read function and the static buffers, in preparation
for transition.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Rusty Russell 2014-12-08 16:50:35 +08:00 • committed by Herbert Xu

parent 25fb8638e9

commit 9372b35e11

1 changed files with 17 additions and 3 deletions

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drivers/char/hw_random/core.c

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