diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2012-10-03 12:26:12 (GMT) |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-10-15 11:53:55 (GMT) |
| commit | 4040d10a3d44023703f81083bb90a3eb45a39eee (patch) | |
| tree | 8c78be2e2a3fed3856e79e2a0a375357c2dfb9f6 /arch/arm/mach-ux500/cpu-db8500.c | |
| parent | a3a6c6a3a13c8fc946da86d0314f4c0d013e749d (diff) | |
| download | linux-fsl-qoriq-4040d10a3d44023703f81083bb90a3eb45a39eee.tar.xz | |
ARM: ux500: add DB serial number to entropy pool
This throws the DB (digital baseband, ASIC) serial number, process
type etc into the entropy pool by way of the device_add_randomness()
call. This should make every device have a unique pool state upon
boot.
Cc: Theodore Tso <tytso@mit.edu>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'arch/arm/mach-ux500/cpu-db8500.c')
| -rw-r--r-- | arch/arm/mach-ux500/cpu-db8500.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c index bcdfe6b..50202a1 100644 --- a/arch/arm/mach-ux500/cpu-db8500.c +++ b/arch/arm/mach-ux500/cpu-db8500.c @@ -17,6 +17,8 @@ #include <linux/platform_device.h> #include <linux/io.h> #include <linux/mfd/abx500/ab8500.h> +#include <linux/platform_data/usb-musb-ux500.h> +#include <linux/random.h> #include <asm/pmu.h> #include <asm/mach/map.h> @@ -24,7 +26,6 @@ #include <mach/hardware.h> #include <mach/setup.h> #include <mach/devices.h> -#include <linux/platform_data/usb-musb-ux500.h> #include <mach/db8500-regs.h> #include "devices-db8500.h" @@ -187,6 +188,8 @@ static const char *db8500_read_soc_id(void) { void __iomem *uid = __io_address(U8500_BB_UID_BASE); + /* Throw these device-specific numbers into the entropy pool */ + add_device_randomness(uid, 0x14); return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x", readl((u32 *)uid+1), readl((u32 *)uid+1), readl((u32 *)uid+2), |