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drivers/macintosh/smu.c: Improve error handling 

This makes two changes:

* As noted by Akinobu Mita in patch
b1fceac2b9, 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>
This commit is contained in:
Julia Lawall 2008-06-24 04:14:52 +10:00 committed by Paul Mackerras
parent 178f8d78fd
commit 73f38fe1b5
1 changed files with 19 additions and 15 deletions
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34
drivers/macintosh/smu.c
View File

@ -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;
}