diff options
Diffstat (limited to 'drivers/crypto/ccp')
| -rw-r--r-- | drivers/crypto/ccp/sev-dev.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 539c303beb3a..e058ba027792 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -1787,8 +1787,14 @@ static int __sev_snp_shutdown_locked(int *error, bool panic) sev->snp_initialized = false; dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n"); - atomic_notifier_chain_unregister(&panic_notifier_list, - &snp_panic_notifier); + /* + * __sev_snp_shutdown_locked() deadlocks when it tries to unregister + * itself during panic as the panic notifier is called with RCU read + * lock held and notifier unregistration does RCU synchronization. + */ + if (!panic) + atomic_notifier_chain_unregister(&panic_notifier_list, + &snp_panic_notifier); /* Reset TMR size back to default */ sev_es_tmr_size = SEV_TMR_SIZE; |