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| author |   Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | 2019-03-05 01:12:19 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 02:54:57 +1000 |
| commit | de269129a48a2d590ba1d20c719e19d86e3ddb3f (patch) | |
| tree | f24b4a3afde2d90ce614a347129acf6324315a1a /arch/powerpc/platforms/powernv/setup.c | |
| parent | powerpc/xmon: add read-only mode (diff) | |
| download | wireguard-linux-de269129a48a2d590ba1d20c719e19d86e3ddb3f.tar.xz wireguard-linux-de269129a48a2d590ba1d20c719e19d86e3ddb3f.zip | |
powerpc/hmi: Fix kernel hang when TB is in error state.
On TOD/TB errors timebase register stops/freezes until HMI error recovery
gets TOD/TB back into running state. On successful recovery, TB starts
running again and udelay() that relies on TB value continues to function
properly. But in case when HMI fails to recover from TOD/TB errors, the
TB register stay freezed. With TB not running the __delay() function
keeps looping and never return. If __delay() is called while in panic
path then system hangs and never reboots after panic.
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/powernv/setup.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index 14befee4b3f1..3cf40f689aac 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -401,7 +401,10 @@ static void __init pnv_setup_machdep_opal(void) /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ ppc_md.machine_check_exception = opal_machine_check; ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; - ppc_md.hmi_exception_early = opal_hmi_exception_early; + if (opal_check_token(OPAL_HANDLE_HMI2)) + ppc_md.hmi_exception_early = opal_hmi_exception_early2; + else + ppc_md.hmi_exception_early = opal_hmi_exception_early; ppc_md.handle_hmi_exception = opal_handle_hmi_exception; } |