From 73f38fe1b563a9d23ffacbda7b51decf41b0c49c Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Tue, 24 Jun 2008 04:14:52 +1000 Subject: [PATCH] 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 Signed-off-by: Paul Mackerras --- drivers/macintosh/smu.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c index 1272184a3a6..76dbf25cb70 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; } -- 2.41.1