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Diffstat (limited to 'arch/powerpc/platforms/pseries/nvram.c')
-rw-r--r--arch/powerpc/platforms/pseries/nvram.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/nvram.c b/arch/powerpc/platforms/pseries/nvram.c
index a76b22844d18..330a57b7c17c 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -625,6 +625,8 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
{
static unsigned int oops_count = 0;
static bool panicking = false;
+ static DEFINE_SPINLOCK(lock);
+ unsigned long flags;
size_t text_len;
unsigned int err_type = ERR_TYPE_KERNEL_PANIC_GZ;
int rc = -1;
@@ -655,6 +657,9 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
if (clobbering_unread_rtas_event())
return;
+ if (!spin_trylock_irqsave(&lock, flags))
+ return;
+
if (big_oops_buf) {
text_len = capture_last_msgs(old_msgs, old_len,
new_msgs, new_len, big_oops_buf, big_oops_buf_sz);
@@ -670,4 +675,6 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
(void) nvram_write_os_partition(&oops_log_partition, oops_buf,
(int) (sizeof(*oops_len) + *oops_len), err_type, ++oops_count);
+
+ spin_unlock_irqrestore(&lock, flags);
}