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dca: make dca_class a static const structure

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The driver core allows for struct class to be in read-only memory. Move
the dca_class structure to be declared at build time placing it into
read-only memory, instead of having to be dynamically allocated at boot
time.

Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Link: https://lore.kernel.org/r/20240412151726.189030-1-ivan.orlov0322@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ivan Orlov 2024-04-12 16:17:26 +01:00 committed by Greg Kroah-Hartman
parent bd7246a19e
commit d7d3ae441e
1 changed files with 12 additions and 8 deletions
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20
drivers/dca/dca-sysfs.c
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@ -13,7 +13,9 @@
#include <linux/gfp.h> #include <linux/gfp.h>
#include <linux/export.h> #include <linux/export.h>
static struct class *dca_class; static const struct class dca_class = {
.name = "dca",
};
static struct idr dca_idr; static struct idr dca_idr;
static spinlock_t dca_idr_lock; static spinlock_t dca_idr_lock;
@ -22,14 +24,14 @@ int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
struct device *cd; struct device *cd;
static int req_count; static int req_count;
cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL, cd = device_create(&dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
"requester%d", req_count++); "requester%d", req_count++);
return PTR_ERR_OR_ZERO(cd); return PTR_ERR_OR_ZERO(cd);
} }
void dca_sysfs_remove_req(struct dca_provider *dca, int slot) void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
{ {
device_destroy(dca_class, MKDEV(0, slot + 1)); device_destroy(&dca_class, MKDEV(0, slot + 1));
} }
int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
@ -49,7 +51,7 @@ int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
if (ret < 0) if (ret < 0)
return ret; return ret;
cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); cd = device_create(&dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
if (IS_ERR(cd)) { if (IS_ERR(cd)) {
spin_lock(&dca_idr_lock); spin_lock(&dca_idr_lock);
idr_remove(&dca_idr, dca->id); idr_remove(&dca_idr, dca->id);
@ -71,20 +73,22 @@ void dca_sysfs_remove_provider(struct dca_provider *dca)
int __init dca_sysfs_init(void) int __init dca_sysfs_init(void)
{ {
int err;
idr_init(&dca_idr); idr_init(&dca_idr);
spin_lock_init(&dca_idr_lock); spin_lock_init(&dca_idr_lock);
dca_class = class_create("dca"); err = class_register(&dca_class);
if (IS_ERR(dca_class)) { if (err) {
idr_destroy(&dca_idr); idr_destroy(&dca_idr);
return PTR_ERR(dca_class); return err;
} }
return 0; return 0;
} }
void __exit dca_sysfs_exit(void) void __exit dca_sysfs_exit(void)
{ {
class_destroy(dca_class); class_unregister(&dca_class);
idr_destroy(&dca_idr); idr_destroy(&dca_idr);
} }