From: Nicholas Piggin <npiggin@gmail.com>
Date: Mon, 26 Nov 2018 02:01:05 +0000 (+1000)
Subject: powerpc/smp: Fix NMI IPI timeout
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1b5fc84aba170bdfe3533396ca9662ceea1609b7;p=openwrt%2Fstaging%2Fblogic.git

powerpc/smp: Fix NMI IPI timeout

The NMI IPI timeout logic is broken, if __smp_send_nmi_ipi() times out
on the first condition, delay_us will be zero which will send it into
the second spin loop with no timeout so it will spin forever.

Fixes: 5b73151fff63 ("powerpc: NMI IPI make NMI IPIs fully sychronous")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 3f15edf25a0d..137196a4248b 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -519,7 +519,7 @@ int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us, bool
 		if (delay_us) {
 			delay_us--;
 			if (!delay_us)
-				break;
+				goto timeout;
 		}
 	}
 
@@ -530,10 +530,11 @@ int __smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us, bool
 		if (delay_us) {
 			delay_us--;
 			if (!delay_us)
-				break;
+				goto timeout;
 		}
 	}
 
+timeout:
 	if (!cpumask_empty(&nmi_ipi_pending_mask)) {
 		/* Timeout waiting for CPUs to call smp_handle_nmi_ipi */
 		ret = 0;