From: Ed Cashin <ecashin@coraid.com>
Date: Thu, 29 Nov 2012 03:19:10 +0000 (+1100)
Subject: aoe: make error messages more specific in static minor allocation
X-Git-Tag: next-20121205~1^2~38
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bf3b55bee6d74b7326da1e97309a434186799825;p=karo-tx-linux.git

aoe: make error messages more specific in static minor allocation

For some special-purpose systems where udev isn't present, static
allocation of minor numbers is desirable.  This update distinguishes
different failure scenarios, to help the user understand what went wrong.

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 91f7c99eb2a9..88ccd6d83c39 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -69,25 +69,34 @@ minor_get_static(ulong *sysminor, ulong aoemaj, int aoemin)
 		NPERSHELF = 16,
 	};
 
+	if (aoemin >= NPERSHELF) {
+		pr_err("aoe: %s %d slots per shelf\n",
+			"static minor device numbers support only",
+			NPERSHELF);
+		error = -1;
+		goto out;
+	}
+
 	n = aoemaj * NPERSHELF + aoemin;
-	if (aoemin >= NPERSHELF || n >= N_DEVS) {
+	if (n >= N_DEVS) {
 		pr_err("aoe: %s with e%ld.%d\n",
 			"cannot use static minor device numbers",
 			aoemaj, aoemin);
 		error = -1;
-	} else {
-		spin_lock_irqsave(&used_minors_lock, flags);
-		if (test_bit(n, used_minors)) {
-			pr_err("aoe: %s %lu\n",
-				"existing device already has static minor number",
-				n);
-			error = -1;
-		} else
-			set_bit(n, used_minors);
-		spin_unlock_irqrestore(&used_minors_lock, flags);
+		goto out;
 	}
 
+	spin_lock_irqsave(&used_minors_lock, flags);
+	if (test_bit(n, used_minors)) {
+		pr_err("aoe: %s %lu\n",
+			"existing device already has static minor number",
+			n);
+		error = -1;
+	} else
+		set_bit(n, used_minors);
+	spin_unlock_irqrestore(&used_minors_lock, flags);
 	*sysminor = n;
+out:
 	return error;
 }