[PATCH 5/6] x86/apic/es7000+summit: Always make valid apicid from acpumask

[Alexander Gordeev]

In case of invalid parameters cpu_mask_to_apicid_and() might return
apicid value of 0 (on Summit) or a uninitialized value (on ES7000),
although it is supposed to return apicid of cpu-0 at least. Fix the
operation to always return a valid apicid.

Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
 arch/x86/kernel/apic/es7000_32.c |    2 ++
 arch/x86/kernel/apic/summit_32.c |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 0c1347d..9882093 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -545,6 +545,8 @@ es7000_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid = new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index e6cc182..b6e6185 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -282,6 +282,8 @@ summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
 		apicid |= new_apicid;
 		round++;
 	}
+	if (!round)
+		return -EINVAL;
 	*dest_id = apicid;
 	return 0;
 }
-- 
1.7.7.6


-- 
Regards,
Alexander Gordeev
agordeev@xxxxxxxxxx
--
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