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Diffstat (limited to 'drivers/firmware/efivars.c')
-rw-r--r--drivers/firmware/efivars.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 7b1c37497c9a..ef5070d86f88 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -1209,7 +1209,16 @@ static int efi_pstore_write(enum pstore_type_id type,
u64 storage_space, remaining_space, max_variable_size;
efi_status_t status = EFI_NOT_FOUND;
- spin_lock(&efivars->lock);
+ if (pstore_cannot_block_path(reason)) {
+ /*
+ * If the lock is taken by another cpu in non-blocking path,
+ * this driver returns without entering firmware to avoid
+ * hanging up.
+ */
+ if (!spin_trylock(&efivars->lock))
+ return -EBUSY;
+ } else
+ spin_lock(&efivars->lock);
/*
* Check if there is a space enough to log.