jsm: fixing error if the driver fails to load

Currently if the driver fails to register on port, the kernel
crashes with the following stack:

cpu 0x1: Vector: 300 (Data Access) at [c0000000e0303090]
    pc: c00000000039aa74: .__mutex_lock_slowpath+0x44/0x10c
    lr: c00000000039aa58: .__mutex_lock_slowpath+0x28/0x10c
[c0000000e03033c0] c00000000026b074 .uart_remove_one_port+0xbc/0x16c
[c0000000e0303460] d0000000000e0554 .jsm_remove_uart_port+0x8c/0x10c [jsm]
[c0000000e03034f0] d0000000000dc034 .jsm_remove_one+0x34/0x108 [jsm]
[c0000000e0303590] c0000000001f4aa0 .pci_device_remove+0x48/0x74
...

This patch just fixes the code flow to abort the load when an
error is detected.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index cd95e21..5673ca9 100644 (file)
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -432,7 +432,7 @@ int __devinit jsm_tty_init(struct jsm_board *brd)
 
 int jsm_uart_port_init(struct jsm_board *brd)
 {
-       int i;
+       int i, rc;
        unsigned int line;
        struct jsm_channel *ch;
 
@@ -467,8 +467,11 @@ int jsm_uart_port_init(struct jsm_board *brd)
                } else
                        set_bit(line, linemap);
                brd->channels[i]->uart_port.line = line;
-               if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port))
-                       printk(KERN_INFO "jsm: add device failed\n");
+               rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port);
+               if (rc){
+                       printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
+                       return rc;
+               }
                else
                        printk(KERN_INFO "jsm: Port %d added\n", i);
        }