Hi Nicholas On 07/16/2018 03:46 PM, Nicholas Mc Guire wrote: > If the device node is not found or the of_iomap() failed, calling > scu_enable would not be safe and could lead to an undefined system > state. So warn in both failure paths before returning. > > Signed-off-by: Nicholas Mc Guire <hof...@osadl.org> > Link: http://lkml.org/lkml/2018/7/16/219 > Fixes: commit 65ebcc115889 ("ARM: sti: Add STiH415 SOC support") > --- > > V2: replacement of WARN_ON() by a meaningful pr_err as suggested by > Patrice CHOTARD <patrice.chot...@st.com>. > > Problem was found by an experimental coccinelle script > > Patch was compile tested with: multi_v7_defconfig (implies > CONFIG_ARCH_STI=y, CONFIG_SMP=y) > (with one sparse warning unrelated to the proposed change) > > Patch is against 4.18-rc4 (localversion-next is next-20180716) > > arch/arm/mach-sti/platsmp.c | 18 ++++++++++++++---- > 1 file changed, 14 insertions(+), 4 deletions(-) > > diff --git a/arch/arm/mach-sti/platsmp.c b/arch/arm/mach-sti/platsmp.c > index 231f19e..530e9a5 100644 > --- a/arch/arm/mach-sti/platsmp.c > +++ b/arch/arm/mach-sti/platsmp.c > @@ -107,12 +107,22 @@ static void __init sti_smp_prepare_cpus(unsigned int > max_cpus) > > np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); > > - if (np) { > - scu_base = of_iomap(np, 0); > - scu_enable(scu_base); > - of_node_put(np); > + if (!np) { > + pr_err("SCU not found at %s:%s():%d\n", > + __FILE__, __func__, __LINE__); > + return; > } > > + scu_base = of_iomap(np, 0); > + of_node_put(np); > + if (!scu_base) { > + pr_err("SCU remap failed at %s:%s():%d\n", > + __FILE__, __func__, __LINE__); > + return; > + } > + > + scu_enable(scu_base); > + > if (max_cpus <= 1) > return; > > Acked-by: Patrice Chotard <patrice.chot...@st.com>
Patrice
