From f61fb8a52cdf8b9b6a6badde84aefe58cb35d315 Mon Sep 17 00:00:00 2001 From: Nathan Lynch Date: Mon, 24 Mar 2008 09:51:45 +1100 Subject: [POWERPC] scanlog_init cleanup and minor fixes scanlog_init() could use some love. * properly return -ENODEV if this system doesn't support scan-log-dump * don't printk if scan-log-dump not present; only older systems have it * convert from create_proc_entry() to preferred proc_create() * allocate zeroed data buffer * fix potential memory leak of ent->data on failed create_proc_entry() * simplify control flow Signed-off-by: Nathan Lynch Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/pseries/scanlog.c | 37 ++++++++++++++++---------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/arch/powerpc/platforms/pseries/scanlog.c b/arch/powerpc/platforms/pseries/scanlog.c index 8e1ef168e2dd..e5b0ea870164 100644 --- a/arch/powerpc/platforms/pseries/scanlog.c +++ b/arch/powerpc/platforms/pseries/scanlog.c @@ -195,31 +195,30 @@ const struct file_operations scanlog_fops = { static int __init scanlog_init(void) { struct proc_dir_entry *ent; + void *data; + int err = -ENOMEM; ibm_scan_log_dump = rtas_token("ibm,scan-log-dump"); - if (ibm_scan_log_dump == RTAS_UNKNOWN_SERVICE) { - printk(KERN_ERR "scan-log-dump not implemented on this system\n"); - return -EIO; - } + if (ibm_scan_log_dump == RTAS_UNKNOWN_SERVICE) + return -ENODEV; - ent = create_proc_entry("ppc64/rtas/scan-log-dump", S_IRUSR, NULL); - if (ent) { - ent->proc_fops = &scanlog_fops; - /* Ideally we could allocate a buffer < 4G */ - ent->data = kmalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); - if (!ent->data) { - printk(KERN_ERR "Failed to allocate a buffer\n"); - remove_proc_entry("scan-log-dump", ent->parent); - return -ENOMEM; - } - ((unsigned int *)ent->data)[0] = 0; - } else { - printk(KERN_ERR "Failed to create ppc64/scan-log-dump proc entry\n"); - return -EIO; - } + /* Ideally we could allocate a buffer < 4G */ + data = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); + if (!data) + goto err; + + ent = proc_create("ppc64/rtas/scan-log-dump", S_IRUSR, NULL, + &scanlog_fops); + if (!ent) + goto err; + + ent->data = data; proc_ppc64_scan_log_dump = ent; return 0; +err: + kfree(data); + return err; } static void __exit scanlog_cleanup(void) -- cgit v1.2.3