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sgi-gru: simplify procfs code 

Use remove_proc_subtree to remove the whole subtree on cleanup, and
unwind the registration loop into individual calls.  Switch to use
proc_create_seq where applicable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-04-10 17:47:15 +02:00
parent e7b087fc6b
commit 978547c5fb
1 changed files with 14 additions and 67 deletions
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79
drivers/misc/sgi-gru/gruprocfs.c
View File

@ -270,16 +270,6 @@ static int options_open(struct inode *inode, struct file *file)
return single_open(file, options_show, NULL);
}
static int cch_open(struct inode *inode, struct file *file)
{
return seq_open(file, &cch_seq_ops);
}
static int gru_open(struct inode *inode, struct file *file)
{
return seq_open(file, &gru_seq_ops);
}
/* *INDENT-OFF* */
static const struct file_operations statistics_fops = {
.open = statistics_open,
@ -305,73 +295,30 @@ static const struct file_operations options_fops = {
.release = single_release,
};
static const struct file_operations cch_fops = {
.open = cch_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static const struct file_operations gru_fops = {
.open = gru_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static struct proc_entry {
char *name;
umode_t mode;
const struct file_operations *fops;
struct proc_dir_entry *entry;
} proc_files[] = {
{"statistics", 0644, &statistics_fops},
{"mcs_statistics", 0644, &mcs_statistics_fops},
{"debug_options", 0644, &options_fops},
{"cch_status", 0444, &cch_fops},
{"gru_status", 0444, &gru_fops},
{NULL}
};
/* *INDENT-ON* */
static struct proc_dir_entry *proc_gru __read_mostly;
static int create_proc_file(struct proc_entry *p)
{
p->entry = proc_create(p->name, p->mode, proc_gru, p->fops);
if (!p->entry)
return -1;
return 0;
}
static void delete_proc_files(void)
{
struct proc_entry *p;
if (proc_gru) {
for (p = proc_files; p->name; p++)
if (p->entry)
remove_proc_entry(p->name, proc_gru);
proc_remove(proc_gru);
}
}
int gru_proc_init(void)
{
struct proc_entry *p;
proc_gru = proc_mkdir("sgi_uv/gru", NULL);
for (p = proc_files; p->name; p++)
if (create_proc_file(p))
if (!proc_gru)
return -1;
if (!proc_create("statistics", 0644, proc_gru, &statistics_fops))
goto err;
if (!proc_create("mcs_statistics", 0644, proc_gru, &mcs_statistics_fops))
goto err;
if (!proc_create("debug_options", 0644, proc_gru, &options_fops))
goto err;
if (!proc_create_seq("cch_status", 0444, proc_gru, &cch_seq_ops))
goto err;
if (!proc_create_seq("gru_status", 0444, proc_gru, &gru_seq_ops))
goto err;
return 0;
err:
delete_proc_files();
remove_proc_subtree("sgi_uv/gru", NULL);
return -1;
}
void gru_proc_exit(void)
{
delete_proc_files();
remove_proc_subtree("sgi_uv/gru", NULL);
}