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| author |   Jason A. Donenfeld <Jason@zx2c4.com> | 2022-06-30 14:16:54 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2022-07-04 21:11:47 +1000 |
| commit | 887502826549caa7e4215fd9e628f48f14c0825a (patch) | |
| tree | 16bb106eacc293427719f27d987add7cf5f70438 /arch/powerpc/platforms | |
| parent | powerpc/memhotplug: Add add_pages override for PPC (diff) | |
| download | linux-dev-887502826549caa7e4215fd9e628f48f14c0825a.tar.xz linux-dev-887502826549caa7e4215fd9e628f48f14c0825a.zip | |
powerpc/powernv: delay rng platform device creation until later in boot
The platform device for the rng must be created much later in boot.
Otherwise it tries to connect to a parent that doesn't yet exist,
resulting in this splat:
[ 0.000478] kobject: '(null)' ((____ptrval____)): is not initialized, yet kobject_get() is being called.
[ 0.002925] [c000000002a0fb30] [c00000000073b0bc] kobject_get+0x8c/0x100 (unreliable)
[ 0.003071] [c000000002a0fba0] [c00000000087e464] device_add+0xf4/0xb00
[ 0.003194] [c000000002a0fc80] [c000000000a7f6e4] of_device_add+0x64/0x80
[ 0.003321] [c000000002a0fcb0] [c000000000a800d0] of_platform_device_create_pdata+0xd0/0x1b0
[ 0.003476] [c000000002a0fd00] [c00000000201fa44] pnv_get_random_long_early+0x240/0x2e4
[ 0.003623] [c000000002a0fe20] [c000000002060c38] random_init+0xc0/0x214
This patch fixes the issue by doing the platform device creation inside
of machine_subsys_initcall.
Fixes: f3eac426657d ("powerpc/powernv: wire up rng during setup_arch")
Cc: stable@vger.kernel.org
Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
[mpe: Change "of node" to "platform device" in change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220630121654.1939181-1-Jason@zx2c4.com
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/powernv/rng.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/powerpc/platforms/powernv/rng.c b/arch/powerpc/platforms/powernv/rng.c index 463c78c52cc5..3805ad13b8f3 100644 --- a/arch/powerpc/platforms/powernv/rng.c +++ b/arch/powerpc/platforms/powernv/rng.c @@ -176,12 +176,8 @@ static int __init pnv_get_random_long_early(unsigned long *v) NULL) != pnv_get_random_long_early) return 0; - for_each_compatible_node(dn, NULL, "ibm,power-rng") { - if (rng_create(dn)) - continue; - /* Create devices for hwrng driver */ - of_platform_device_create(dn, NULL, NULL); - } + for_each_compatible_node(dn, NULL, "ibm,power-rng") + rng_create(dn); if (!ppc_md.get_random_seed) return 0; @@ -205,10 +201,18 @@ void __init pnv_rng_init(void) static int __init pnv_rng_late_init(void) { + struct device_node *dn; unsigned long v; + /* In case it wasn't called during init for some other reason. */ if (ppc_md.get_random_seed == pnv_get_random_long_early) pnv_get_random_long_early(&v); + + if (ppc_md.get_random_seed == powernv_get_random_long) { + for_each_compatible_node(dn, NULL, "ibm,power-rng") + of_platform_device_create(dn, NULL, NULL); + } + return 0; } machine_subsys_initcall(powernv, pnv_rng_late_init); |