hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I82QPR
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On Kunpeng920 platform, when firmware triggers SDEI event too soon, A WARN_ON() will be called in sdei_watchdog_callback(), this leads to warning "sdei: unsafe: exception during handler" being reported in _sdei_handler().
As the comments for the warning mentioned, We took a synchronous exception from the SDEI handler. This could deadlock, and if you interrupt KVM it will hyp-panic instead.
Remove the WARN_ON() to avoid potential issue and warning.
Fixes: 37433b57ffdd ("sdei_watchdog: avoid possible false hardlockup") Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- arch/arm64/kernel/watchdog_sdei.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/arch/arm64/kernel/watchdog_sdei.c b/arch/arm64/kernel/watchdog_sdei.c index a499a14b23c1..5884abdaeb9d 100644 --- a/arch/arm64/kernel/watchdog_sdei.c +++ b/arch/arm64/kernel/watchdog_sdei.c @@ -78,7 +78,6 @@ static int sdei_watchdog_callback(u32 event, if (delta < watchdog_thresh * (u64)NSEC_PER_SEC * 4 / 5) { pr_err(FW_BUG "SDEI Watchdog event triggered too soon, " "time to last check:%lld ns\n", delta); - WARN_ON(1); return 0; }