powerpc: use non-racy method for proc entries creation
Use proc_create()/proc_create_data() to make sure that ->proc_fops and ->data be setup before gluing PDE to main tree. Add correct ->owner to proc_fops to fix reading/module unloading race. Signed-off-by: Denis V. Lunev <den@openvz.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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6f1c86ec31
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667471386d
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@ -591,10 +591,8 @@ int __init lparcfg_init(void)
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!firmware_has_feature(FW_FEATURE_ISERIES))
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mode |= S_IWUSR;
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ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
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if (ent) {
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ent->proc_fops = &lparcfg_fops;
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} else {
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ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
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if (!ent) {
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printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
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return -EIO;
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}
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@ -68,12 +68,11 @@ static int __init proc_ppc64_init(void)
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{
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struct proc_dir_entry *pde;
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pde = create_proc_entry("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL);
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pde = proc_create_data("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL,
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&page_map_fops, vdso_data);
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if (!pde)
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return 1;
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pde->data = vdso_data;
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pde->size = PAGE_SIZE;
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pde->proc_fops = &page_map_fops;
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return 0;
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}
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@ -255,8 +255,6 @@ static void check_location(struct seq_file *m, const char *c);
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static int __init proc_rtas_init(void)
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{
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struct proc_dir_entry *entry;
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if (!machine_is(pseries))
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return -ENODEV;
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@ -264,35 +262,20 @@ static int __init proc_rtas_init(void)
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if (rtas_node == NULL)
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return -ENODEV;
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entry = create_proc_entry("ppc64/rtas/progress", S_IRUGO|S_IWUSR, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_progress_operations;
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entry = create_proc_entry("ppc64/rtas/clock", S_IRUGO|S_IWUSR, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_clock_operations;
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entry = create_proc_entry("ppc64/rtas/poweron", S_IWUSR|S_IRUGO, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_poweron_operations;
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entry = create_proc_entry("ppc64/rtas/sensors", S_IRUGO, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_sensors_operations;
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entry = create_proc_entry("ppc64/rtas/frequency", S_IWUSR|S_IRUGO,
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NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_tone_freq_operations;
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entry = create_proc_entry("ppc64/rtas/volume", S_IWUSR|S_IRUGO, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_tone_volume_operations;
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entry = create_proc_entry("ppc64/rtas/rmo_buffer", S_IRUSR, NULL);
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if (entry)
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entry->proc_fops = &ppc_rtas_rmo_buf_ops;
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proc_create("ppc64/rtas/progress", S_IRUGO|S_IWUSR, NULL,
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&ppc_rtas_progress_operations);
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proc_create("ppc64/rtas/clock", S_IRUGO|S_IWUSR, NULL,
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&ppc_rtas_clock_operations);
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proc_create("ppc64/rtas/poweron", S_IWUSR|S_IRUGO, NULL,
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&ppc_rtas_poweron_operations);
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proc_create("ppc64/rtas/sensors", S_IRUGO, NULL,
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&ppc_rtas_sensors_operations);
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proc_create("ppc64/rtas/frequency", S_IWUSR|S_IRUGO, NULL,
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&ppc_rtas_tone_freq_operations);
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proc_create("ppc64/rtas/volume", S_IWUSR|S_IRUGO, NULL,
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&ppc_rtas_tone_volume_operations);
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proc_create("ppc64/rtas/rmo_buffer", S_IRUSR, NULL,
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&ppc_rtas_rmo_buf_ops);
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return 0;
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}
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@ -704,18 +704,11 @@ static int initialize_flash_pde_data(const char *rtas_call_name,
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static struct proc_dir_entry *create_flash_pde(const char *filename,
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const struct file_operations *fops)
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{
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struct proc_dir_entry *ent = NULL;
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ent = create_proc_entry(filename, S_IRUSR | S_IWUSR, NULL);
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if (ent != NULL) {
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ent->proc_fops = fops;
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ent->owner = THIS_MODULE;
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}
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return ent;
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return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
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}
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static const struct file_operations rtas_flash_operations = {
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.owner = THIS_MODULE,
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.read = rtas_flash_read,
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.write = rtas_flash_write,
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.open = rtas_excl_open,
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@ -723,6 +716,7 @@ static const struct file_operations rtas_flash_operations = {
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};
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static const struct file_operations manage_flash_operations = {
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.owner = THIS_MODULE,
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.read = manage_flash_read,
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.write = manage_flash_write,
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.open = rtas_excl_open,
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@ -730,6 +724,7 @@ static const struct file_operations manage_flash_operations = {
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};
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static const struct file_operations validate_flash_operations = {
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.owner = THIS_MODULE,
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.read = validate_flash_read,
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.write = validate_flash_write,
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.open = rtas_excl_open,
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@ -1063,10 +1063,9 @@ int __init spu_sched_init(void)
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mod_timer(&spuloadavg_timer, 0);
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entry = create_proc_entry("spu_loadavg", 0, NULL);
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entry = proc_create("spu_loadavg", 0, NULL, &spu_loadavg_fops);
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if (!entry)
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goto out_stop_kthread;
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entry->proc_fops = &spu_loadavg_fops;
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pr_debug("spusched: tick: %d, min ticks: %d, default ticks: %d\n",
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SPUSCHED_TICK, MIN_SPU_TIMESLICE, DEF_SPU_TIMESLICE);
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@ -201,10 +201,9 @@ static int __init sputrace_init(void)
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if (!sputrace_log)
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goto out;
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entry = create_proc_entry("sputrace", S_IRUSR, NULL);
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entry = proc_create("sputrace", S_IRUSR, NULL, &sputrace_fops);
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if (!entry)
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goto out_free_log;
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entry->proc_fops = &sputrace_fops;
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for (i = 0; i < ARRAY_SIZE(spu_probes); i++) {
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struct spu_probe *p = &spu_probes[i];
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@ -330,15 +330,11 @@ static const struct file_operations proc_lpevents_operations = {
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static int __init proc_lpevents_init(void)
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{
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struct proc_dir_entry *e;
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if (!firmware_has_feature(FW_FEATURE_ISERIES))
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return 0;
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e = create_proc_entry("iSeries/lpevents", S_IFREG|S_IRUGO, NULL);
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if (e)
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e->proc_fops = &proc_lpevents_operations;
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proc_create("iSeries/lpevents", S_IFREG|S_IRUGO, NULL,
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&proc_lpevents_operations);
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return 0;
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}
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__initcall(proc_lpevents_init);
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@ -1255,11 +1255,11 @@ static int __init mf_proc_init(void)
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if (i == 3) /* no vmlinux entry for 'D' */
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continue;
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ent = create_proc_entry("vmlinux", S_IFREG|S_IWUSR, mf);
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ent = proc_create_data("vmlinux", S_IFREG|S_IWUSR, mf,
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&proc_vmlinux_operations,
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(void *)(long)i);
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if (!ent)
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return 1;
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ent->data = (void *)(long)i;
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ent->proc_fops = &proc_vmlinux_operations;
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}
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ent = create_proc_entry("side", S_IFREG|S_IRUSR|S_IWUSR, mf_proc_root);
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@ -110,15 +110,11 @@ static const struct file_operations proc_titantod_operations = {
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static int __init iseries_proc_init(void)
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{
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struct proc_dir_entry *e;
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if (!firmware_has_feature(FW_FEATURE_ISERIES))
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return 0;
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e = create_proc_entry("iSeries/titanTod", S_IFREG|S_IRUGO, NULL);
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if (e)
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e->proc_fops = &proc_titantod_operations;
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proc_create("iSeries/titanTod", S_IFREG|S_IRUGO, NULL,
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&proc_titantod_operations);
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return 0;
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}
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__initcall(iseries_proc_init);
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@ -180,15 +180,10 @@ static const struct file_operations proc_viopath_operations = {
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static int __init vio_proc_init(void)
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{
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struct proc_dir_entry *e;
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if (!firmware_has_feature(FW_FEATURE_ISERIES))
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return 0;
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e = create_proc_entry("iSeries/config", 0, NULL);
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if (e)
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e->proc_fops = &proc_viopath_operations;
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proc_create("iSeries/config", 0, NULL, &proc_viopath_operations);
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return 0;
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}
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__initcall(vio_proc_init);
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@ -1259,14 +1259,8 @@ static const struct file_operations proc_eeh_operations = {
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static int __init eeh_init_proc(void)
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{
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struct proc_dir_entry *e;
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if (machine_is(pseries)) {
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e = create_proc_entry("ppc64/eeh", 0, NULL);
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if (e)
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e->proc_fops = &proc_eeh_operations;
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}
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if (machine_is(pseries))
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proc_create("ppc64/eeh", 0, NULL, &proc_eeh_operations);
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return 0;
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}
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__initcall(eeh_init_proc);
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@ -512,12 +512,9 @@ static int proc_ppc64_create_ofdt(void)
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if (!machine_is(pseries))
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return 0;
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ent = create_proc_entry("ppc64/ofdt", S_IWUSR, NULL);
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if (ent) {
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ent->data = NULL;
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ent = proc_create("ppc64/ofdt", S_IWUSR, NULL, &ofdt_fops);
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if (ent)
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ent->size = 0;
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ent->proc_fops = &ofdt_fops;
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}
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return 0;
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}
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@ -468,10 +468,9 @@ static int __init rtas_init(void)
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return -ENOMEM;
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}
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entry = create_proc_entry("ppc64/rtas/error_log", S_IRUSR, NULL);
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if (entry)
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entry->proc_fops = &proc_rtas_log_operations;
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else
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entry = proc_create("ppc64/rtas/error_log", S_IRUSR, NULL,
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&proc_rtas_log_operations);
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if (!entry)
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printk(KERN_ERR "Failed to create error_log proc entry\n");
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if (kernel_thread(rtasd, NULL, CLONE_FS) < 0)
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