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| author | Ivan Orlov <ivan.orlov0322@gmail.com> | 2024-04-12 16:17:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-10 10:22:20 +0200 |
| commit | d7d3ae441e29f0ca56c69cdd3a47769227b7be3d (patch) | |
| tree | 57d0597244174c1e54647a29ce276f155868e442 | |
| parent | bd7246a19ed85451befc3c8fc6038a7d955e7d5f (diff) | |
| download | linux-d7d3ae441e29f0ca56c69cdd3a47769227b7be3d.tar.gz linux-d7d3ae441e29f0ca56c69cdd3a47769227b7be3d.tar.bz2 linux-d7d3ae441e29f0ca56c69cdd3a47769227b7be3d.zip | |
dca: make dca_class a static const structure
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>
| -rw-r--r-- | drivers/dca/dca-sysfs.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/dca/dca-sysfs.c b/drivers/dca/dca-sysfs.c index fcc83ede0909..b915c2b4601e 100644 --- a/drivers/dca/dca-sysfs.c +++ b/drivers/dca/dca-sysfs.c @@ -13,7 +13,9 @@ #include <linux/gfp.h> #include <linux/export.h> -static struct class *dca_class; +static const struct class dca_class = { + .name = "dca", +}; static struct idr dca_idr; 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; 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++); return PTR_ERR_OR_ZERO(cd); } 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) @@ -49,7 +51,7 @@ int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) if (ret < 0) 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)) { spin_lock(&dca_idr_lock); 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 err; + idr_init(&dca_idr); spin_lock_init(&dca_idr_lock); - dca_class = class_create("dca"); - if (IS_ERR(dca_class)) { + err = class_register(&dca_class); + if (err) { idr_destroy(&dca_idr); - return PTR_ERR(dca_class); + return err; } return 0; } void __exit dca_sysfs_exit(void) { - class_destroy(dca_class); + class_unregister(&dca_class); idr_destroy(&dca_idr); } |