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authorJulia Lawall <julia@diku.dk>2008-06-24 04:14:52 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-01 11:28:17 +1000
commit73f38fe1b563a9d23ffacbda7b51decf41b0c49c (patch)
tree37e228071b05696350bc015f26a5a9270dde927f
parent178f8d78fdeaace8b22a759a059b74f39caf23a4 (diff)
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>
-rw-r--r--drivers/macintosh/smu.c34
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 1272184..76dbf25 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;
}