drivers/macintosh/smu.c: Improve error handling

This makes two changes:

* As noted by Akinobu Mita in patch
b1fceac2b9e04d278316b2faddf276015fc06e3b, alloc_bootmem never returns NULL
and always returns a zeroed region of memory.  Thus the error checking code
and memset after the call to alloc_bootmem are not necessary.

* The old error handling code consisted of setting a global variable to
NULL and returning an error code, which could cause previously allocated
resources never to be freed.  The patch adds calls to appropriate resource
deallocation functions.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 19 insertions, 15 deletions

diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 1272184a3a6f..76dbf25cb70f 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -474,6 +474,7 @@ int __init smu_init (void)
 {
         struct device_node *np;
         const u32 *data;
+        int ret = 0;
 
         np = of_find_node_by_type(NULL, "smu");
         if (np == NULL)
@@ -483,16 +484,11 @@ int __init smu_init (void)
 
         if (smu_cmdbuf_abs == 0) {
                 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
-                of_node_put(np);
-                return -EINVAL;
+                ret = -EINVAL;
+                goto fail_np;
         }
 
         smu = alloc_bootmem(sizeof(struct smu_device));
-        if (smu == NULL) {
-                of_node_put(np);
-                return -ENOMEM;
-        }
-        memset(smu, 0, sizeof(*smu));
 
         spin_lock_init(&smu->lock);
         INIT_LIST_HEAD(&smu->cmd_list);
@@ -510,14 +506,14 @@ int __init smu_init (void)
         smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
         if (smu->db_node == NULL) {
                 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
-                goto fail;
+                ret = -ENXIO;
+                goto fail_bootmem;
         }
         data = of_get_property(smu->db_node, "reg", NULL);
         if (data == NULL) {
-                of_node_put(smu->db_node);
-                smu->db_node = NULL;
                 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
-                goto fail;
+                ret = -ENXIO;
+                goto fail_db_node;
         }
 
         /* Current setup has one doorbell GPIO that does both doorbell
@@ -551,7 +547,8 @@ int __init smu_init (void)
         smu->db_buf = ioremap(0x8000860c, 0x1000);
         if (smu->db_buf == NULL) {
                 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
-                goto fail;
+                ret = -ENXIO;
+                goto fail_msg_node;
         }
 
         /* U3 has an issue with NAP mode when issuing SMU commands */
@@ -562,10 +559,17 @@ int __init smu_init (void)
         sys_ctrler = SYS_CTRLER_SMU;
         return 0;
 
- fail:
+fail_msg_node:
+        if (smu->msg_node)
+                of_node_put(smu->msg_node);
+fail_db_node:
+        of_node_put(smu->db_node);
+fail_bootmem:
+        free_bootmem((unsigned long)smu, sizeof(struct smu_device));
         smu = NULL;
-        return -ENXIO;
-
+fail_np:
+        of_node_put(np);
+        return ret;
 }