[14/14] char: lp: return proper error values from attach

Commit Message

Sudip Mukherjee April 8, 2015, 11:20 a.m. UTC

now that we are monitoring the return value from attach, make the
required changes to return proper value from its attach function.

Signed-off-by: Sudip Mukherjee <[e-mail]>
---
 drivers/char/lp.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

Patch

diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index c4094c4..6988480 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -900,34 +900,40 @@  static int lp_register(int nr, struct parport *port)
 	return 0;
 }
 
-static void lp_attach (struct parport *port)
+static int lp_attach(struct parport *port)
 {
 	unsigned int i;
+	int ret = -ENODEV;
 
 	switch (parport_nr[0]) {
 	case LP_PARPORT_UNSPEC:
 	case LP_PARPORT_AUTO:
 		if (parport_nr[0] == LP_PARPORT_AUTO &&
 		    port->probe_info[0].class != PARPORT_CLASS_PRINTER)
-			return;
+			return ret;
 		if (lp_count == LP_NO) {
 			printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
-			return;
+			return ret;
 		}
-		if (!lp_register(lp_count, port))
+		if (!lp_register(lp_count, port)) {
 			lp_count++;
+			ret = 0;
+		}
 		break;
 
 	default:
 		for (i = 0; i < LP_NO; i++) {
 			if (port->number == parport_nr[i]) {
-				if (!lp_register(i, port))
+				if (!lp_register(i, port)) {
 					lp_count++;
+					ret = 0;
+				}
 				break;
 			}
 		}
 		break;
 	}
+	return ret;
 }
 
 static void lp_detach (struct parport *port)