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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2018-08-27 08:27:27 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-10-20 13:26:47 +1100 |
| commit | 6beb3381b12793726783a5e9428250743659c6cf (patch) | |
| tree | 53bb1daa2c46727e4d149c15397502ec49a205ec /arch/powerpc/sysdev | |
| parent | powerpc/mm: fix always true/false warning in slice.c (diff) | |
| download | linux-dev-6beb3381b12793726783a5e9428250743659c6cf.tar.xz linux-dev-6beb3381b12793726783a5e9428250743659c6cf.zip | |
powerpc/sysdev/ipic: check primary_ipic NULL pointer before using it
ipic_get_mcp_status() is used by targets implementing NMI
watchdog in target specific machine check handler in order
to known whether a machine check results from a watchdog
NMI reset.
In case of very early machine check, primary_ipic pointer
might not have been set yet, so ipic_get_mcp_status() needs
to check it for nullity before using it.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/sysdev')
| -rw-r--r-- | arch/powerpc/sysdev/ipic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/sysdev/ipic.c b/arch/powerpc/sysdev/ipic.c index 535cf1f6941c..6300123ce965 100644 --- a/arch/powerpc/sysdev/ipic.c +++ b/arch/powerpc/sysdev/ipic.c @@ -846,7 +846,7 @@ void ipic_disable_mcp(enum ipic_mcp_irq mcp_irq) u32 ipic_get_mcp_status(void) { - return ipic_read(primary_ipic->regs, IPIC_SERSR); + return primary_ipic ? ipic_read(primary_ipic->regs, IPIC_SERSR) : 0; } void ipic_clear_mcp_status(u32 mask) |