linux-stable.git/drivers/char/hw_random, branch linux-4.8.y

hwrng: core - Don't use a stack buffer in add_early_randomness()

2016-11-18T09:51:51+00:00

commit 6d4952d9d9d4dc2bb9c0255d95a09405a1e958f7 upstream.

hw_random carefully avoids using a stack buffer except in
add_early_randomness().  This causes a crash in virtio_rng if
CONFIG_VMAP_STACK=y.

Reported-by: Matt Mullins 
Tested-by: Matt Mullins 
Fixes: d3cc7996473a ("hwrng: fetch randomness only after device init")
Signed-off-by: Andy Lutomirski 
Signed-off-by: Herbert Xu 
Signed-off-by: Greg Kroah-Hartman

hwrng: omap - Only fail if pm_runtime_get_sync returns < 0

2016-10-31T11:02:10+00:00

commit ad8529fde9e3601180a839867a8ab041109aebb5 upstream.

Currently omap-rng checks the return value of pm_runtime_get_sync and
reports failure if anything is returned, however it should be checking
if ret < 0 as pm_runtime_get_sync return 0 on success but also can return
1 if the device was already active which is not a failure case. Only
values < 0 are actual failures.

Fixes: 61dc0a446e5d ("hwrng: omap - Fix assumption that runtime_get_sync will always succeed")
Signed-off-by: Dave Gerlach 
Signed-off-by: Herbert Xu 
Signed-off-by: Greg Kroah-Hartman

hwrng: mxc-rnga - Fix Kconfig dependency

2016-08-24T12:51:18+00:00

We can directly depend on SOC_IMX31 since commit c9ee94965dce
("ARM: imx: deconstruct mxc_rnga initialization")

Since that commit, CONFIG_HW_RANDOM_MXC_RNGA could not be switched on
with unknown symbol ARCH_HAS_RNGA and mxc-rnga.o can't be generated with
ARCH=arm make M=drivers/char/hw_random
Previously, HW_RANDOM_MXC_RNGA required ARCH_HAS_RNGA
which was based on IMX_HAVE_PLATFORM_MXC_RNGA  && ARCH_MXC.
IMX_HAVE_PLATFORM_MXC_RNGA  was based on SOC_IMX31.

Fixes: c9ee94965dce ("ARM: imx: deconstruct mxc_rnga initialization")
Signed-off-by: Fabian Frederick 
Acked-by: Arnd Bergmann 
Signed-off-by: Herbert Xu

hwrng: omap - Fix assumption that runtime_get_sync will always succeed

2016-06-27T08:57:49+00:00

pm_runtime_get_sync does return a error value that must be checked for
error conditions, else, due to various reasons, the device maynot be
enabled and the system will crash due to lack of clock to the hardware
module.

Before:
12.562784] [00000000] *pgd=fe193835
12.562792] Internal error: : 1406 [#1] SMP ARM
[...]
12.562864] CPU: 1 PID: 241 Comm: modprobe Not tainted 4.7.0-rc4-next-20160624 #2
12.562867] Hardware name: Generic DRA74X (Flattened Device Tree)
12.562872] task: ed51f140 ti: ed44c000 task.ti: ed44c000
12.562886] PC is at omap4_rng_init+0x20/0x84 [omap_rng]
12.562899] LR is at set_current_rng+0xc0/0x154 [rng_core]
[...]

After the proper checks:
[   94.366705] omap_rng 48090000.rng: _od_fail_runtime_resume: FIXME:
missing hwmod/omap_dev info
[   94.375767] omap_rng 48090000.rng: Failed to runtime_get device -19
[   94.382351] omap_rng 48090000.rng: initialization failed.

Fixes: 665d92fa85b5 ("hwrng: OMAP: convert to use runtime PM")
Cc: Paul Walmsley 
Signed-off-by: Nishanth Menon 
Signed-off-by: Herbert Xu

hwrng: bcm2835 - Add support for Broadcom BCM5301x

2016-06-24T13:24:58+00:00

The Broadcom BCM5301x SoCs (Northstar) utilize the same random number
generator peripheral as Northstar Plus and BCM2835, but just like the
NSP SoC, we need to enable the interrupt.

Signed-off-by: Florian Fainelli 
Signed-off-by: Herbert Xu

hwrng: meson - Add Amlogic Meson Hardware Random Generator

2016-06-13T09:47:51+00:00

Add support for the Amlogic Meson SoCs hardware random generator.

Signed-off-by: Neil Armstrong 
Signed-off-by: Herbert Xu

hwrng: exynos - fixup IO accesors

2016-06-13T09:47:50+00:00

The __raw IO functions are not endian safe, so use the readl_relaxed
and writel_relaxed versions of these.

Signed-off-by: Ben Dooks 
Signed-off-by: Herbert Xu

hwrng: bcm2835 - Read as much data as available

2016-05-31T09:52:29+00:00

Read the requested number of data from the fifo

Signed-off-by: Yendapally Reddy Dhananjaya Reddy 
Reviewed-by: Eric Anholt 
Signed-off-by: Herbert Xu

hwrng: bcm2835 - Support Broadcom NSP SoC rng

2016-05-31T09:52:23+00:00

This supports the random number generator available in NSP SoC.
Masks the rng interrupt for NSP.

Signed-off-by: Yendapally Reddy Dhananjaya Reddy 
Acked-by: Eric Anholt 
Signed-off-by: Herbert Xu

hwrng: stm32 - fix maybe uninitialized variable warning

2016-05-31T08:41:57+00:00

This patch fixes the following warning:
drivers/char/hw_random/stm32-rng.c: In function 'stm32_rng_read':
drivers/char/hw_random/stm32-rng.c:82:19: warning: 'sr' may be used
                                        uninitialized in this function

Reported-by: Sudip Mukherjee 
Suggested-by: Arnd Bergmann 
Cc: Daniel Thompson 
Signed-off-by: Maxime Coquelin 
Reviewed-by: Daniel Thompson 
Signed-off-by: Herbert Xu