---

yaml --- r: 352983 b: refs/heads/master c: e59310a h: refs/heads/master i: 352981: 4fd0f46 352979: 0e7bcde 352975: a27f57c v: v3
git-mirror · Jan 11, 2013 · dc06543 · dc06543
1 parent dd4f29b
commit dc06543
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Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9f244e9cfd70c7c0f82d3c92ce772ab2a92d9f64
+refs/heads/master: e59310adf5eebce108f78b6c47bb330aae2e1666
diff --git a/trunk/drivers/firmware/efivars.c b/trunk/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.