driver core: bus: mark the struct bus_type for sysfs callbacks as constant

struct bus_type should never be modified in a sysfs callback as there is
nothing in the structure to modify, and frankly, the structure is almost
never used in a sysfs callback, so mark it as constant to allow struct
bus_type to be moved to read-only memory.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Ben Widawsky <bwidawsk@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Harald Freudenberger <freude@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hu Haowen <src.res@email.cn>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Stuart Yoder <stuyoder@gmail.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Yanteng Si <siyanteng@loongson.cn>
Acked-by: Ilya Dryomov <idryomov@gmail.com> # rbd
Acked-by: Ira Weiny <ira.weiny@intel.com> # cxl
Reviewed-by: Alex Shi <alexs@kernel.org>
Acked-by: Iwona Winiarska <iwona.winiarska@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>	# pci
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com> # scsi
Link: https://lore.kernel.org/r/20230313182918.1312597-23-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/driver-api/driver-model/bus.rst

@@ -125,8 +125,8 @@ Exporting Attributes
 
   struct bus_attribute {
 	struct attribute	attr;
-	ssize_t (*show)(struct bus_type *, char * buf);
-	ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
+	ssize_t (*show)(const struct bus_type *, char * buf);
+	ssize_t (*store)(const struct bus_type *, const char * buf, size_t count);
   };
 
 Bus drivers can export attributes using the BUS_ATTR_RW macro that works

Documentation/filesystems/sysfs.rst

@@ -373,8 +373,8 @@ Structure::
 
     struct bus_attribute {
 	    struct attribute        attr;
-	    ssize_t (*show)(struct bus_type *, char * buf);
-	    ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
+	    ssize_t (*show)(const struct bus_type *, char * buf);
+	    ssize_t (*store)(const struct bus_type *, const char * buf, size_t count);
     };
 
 Declaring::

Documentation/translations/zh_CN/filesystems/sysfs.txt

@@ -329,8 +329,8 @@ void device_remove_file(struct device *dev, const struct device_attribute * attr
 
 struct bus_attribute {
         struct attribute        attr;
-        ssize_t (*show)(struct bus_type *, char * buf);
-        ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
+        ssize_t (*show)(const struct bus_type *, char * buf);
+        ssize_t (*store)(const struct bus_type *, const char * buf, size_t count);
 };
 
 声明:

Documentation/translations/zh_TW/filesystems/sysfs.txt

@@ -332,8 +332,8 @@ void device_remove_file(struct device *dev, const struct device_attribute * attr
 
 struct bus_attribute {
         struct attribute        attr;
-        ssize_t (*show)(struct bus_type *, char * buf);
-        ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
+        ssize_t (*show)(const struct bus_type *, char * buf);
+        ssize_t (*store)(const struct bus_type *, const char * buf, size_t count);
 };
 
 聲明:

arch/powerpc/platforms/pseries/ibmebus.c

@@ -267,7 +267,7 @@ static char *ibmebus_chomp(const char *in, size_t count)
 	return out;
 }
 
-static ssize_t probe_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t probe_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	struct device_node *dn = NULL;
 	struct device *dev;
@@ -305,7 +305,7 @@ static ssize_t probe_store(struct bus_type *bus, const char *buf, size_t count)
 }
 static BUS_ATTR_WO(probe);
 
-static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	struct device *dev;
 	char *path;

arch/powerpc/platforms/pseries/vio.c

@@ -1006,7 +1006,7 @@ ATTRIBUTE_GROUPS(vio_cmo_dev);
 /* sysfs bus functions and data structures for CMO */
 
 #define viobus_cmo_rd_attr(name)                                        \
-static ssize_t cmo_bus_##name##_show(struct bus_type *bt, char *buf)    \
+static ssize_t cmo_bus_##name##_show(const struct bus_type *bt, char *buf)    \
 {                                                                       \
 	return sprintf(buf, "%lu\n", vio_cmo.name);                     \
 }                                                                       \
@@ -1015,7 +1015,7 @@ static struct bus_attribute bus_attr_cmo_bus_##name =			\
 
 #define viobus_cmo_pool_rd_attr(name, var)                              \
 static ssize_t                                                          \
-cmo_##name##_##var##_show(struct bus_type *bt, char *buf)               \
+cmo_##name##_##var##_show(const struct bus_type *bt, char *buf)         \
 {                                                                       \
 	return sprintf(buf, "%lu\n", vio_cmo.name.var);                 \
 }                                                                       \
@@ -1030,12 +1030,12 @@ viobus_cmo_pool_rd_attr(reserve, size);
 viobus_cmo_pool_rd_attr(excess, size);
 viobus_cmo_pool_rd_attr(excess, free);
 
-static ssize_t cmo_high_show(struct bus_type *bt, char *buf)
+static ssize_t cmo_high_show(const struct bus_type *bt, char *buf)
 {
 	return sprintf(buf, "%lu\n", vio_cmo.high);
 }
 
-static ssize_t cmo_high_store(struct bus_type *bt, const char *buf,
+static ssize_t cmo_high_store(const struct bus_type *bt, const char *buf,
 			      size_t count)
 {
 	unsigned long flags;

drivers/ata/pata_parport/pata_parport.c

@@ -554,8 +554,7 @@ void pata_parport_unregister_driver(struct pi_protocol *pr)
 }
 EXPORT_SYMBOL_GPL(pata_parport_unregister_driver);
 
-static ssize_t new_device_store(struct bus_type *bus, const char *buf,
-				size_t count)
+static ssize_t new_device_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	char port[12] = "auto";
 	char protocol[8] = "auto";
@@ -630,8 +629,7 @@ static void pi_remove_one(struct device *dev)
 	/* pata_parport_dev_release will do kfree(pi) */
 }
 
-static ssize_t delete_device_store(struct bus_type *bus, const char *buf,
-				   size_t count)
+static ssize_t delete_device_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	struct device *dev;
 

drivers/base/bus.c

@@ -274,7 +274,7 @@ static ssize_t bind_store(struct device_driver *drv, const char *buf,
 }
 static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store);
 
-static ssize_t drivers_autoprobe_show(struct bus_type *bus, char *buf)
+static ssize_t drivers_autoprobe_show(const struct bus_type *bus, char *buf)
 {
 	struct subsys_private *sp = bus_to_subsys(bus);
 	int ret;
@@ -287,7 +287,7 @@ static ssize_t drivers_autoprobe_show(struct bus_type *bus, char *buf)
 	return ret;
 }
 
-static ssize_t drivers_autoprobe_store(struct bus_type *bus,
+static ssize_t drivers_autoprobe_store(const struct bus_type *bus,
 				       const char *buf, size_t count)
 {
 	struct subsys_private *sp = bus_to_subsys(bus);
@@ -304,7 +304,7 @@ static ssize_t drivers_autoprobe_store(struct bus_type *bus,
 	return count;
 }
 
-static ssize_t drivers_probe_store(struct bus_type *bus,
+static ssize_t drivers_probe_store(const struct bus_type *bus,
 				   const char *buf, size_t count)
 {
 	struct device *dev;
@@ -808,7 +808,7 @@ static void klist_devices_put(struct klist_node *n)
 	put_device(dev);
 }
 
-static ssize_t bus_uevent_store(struct bus_type *bus,
+static ssize_t bus_uevent_store(const struct bus_type *bus,
 				const char *buf, size_t count)
 {
 	struct subsys_private *sp = bus_to_subsys(bus);

drivers/block/rbd.c

@@ -491,12 +491,12 @@ static bool single_major = true;
 module_param(single_major, bool, 0444);
 MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)");
 
-static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count);
-static ssize_t remove_store(struct bus_type *bus, const char *buf,
+static ssize_t add_store(const struct bus_type *bus, const char *buf, size_t count);
+static ssize_t remove_store(const struct bus_type *bus, const char *buf,
 			    size_t count);
-static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
+static ssize_t add_single_major_store(const struct bus_type *bus, const char *buf,
 				      size_t count);
-static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
+static ssize_t remove_single_major_store(const struct bus_type *bus, const char *buf,
 					 size_t count);
 static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth);
 
@@ -538,7 +538,7 @@ static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
 	return is_lock_owner;
 }
 
-static ssize_t supported_features_show(struct bus_type *bus, char *buf)
+static ssize_t supported_features_show(const struct bus_type *bus, char *buf)
 {
 	return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
 }
@@ -6967,9 +6967,7 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
 	return ret;
 }
 
-static ssize_t do_rbd_add(struct bus_type *bus,
-			  const char *buf,
-			  size_t count)
+static ssize_t do_rbd_add(const char *buf, size_t count)
 {
 	struct rbd_device *rbd_dev = NULL;
 	struct ceph_options *ceph_opts = NULL;
@@ -7081,18 +7079,18 @@ static ssize_t do_rbd_add(struct bus_type *bus,
 	goto out;
 }
 
-static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t add_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	if (single_major)
 		return -EINVAL;
 
-	return do_rbd_add(bus, buf, count);
+	return do_rbd_add(buf, count);
 }
 
-static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
+static ssize_t add_single_major_store(const struct bus_type *bus, const char *buf,
 				      size_t count)
 {
-	return do_rbd_add(bus, buf, count);
+	return do_rbd_add(buf, count);
 }
 
 static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
@@ -7122,9 +7120,7 @@ static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
 	}
 }
 
-static ssize_t do_rbd_remove(struct bus_type *bus,
-			     const char *buf,
-			     size_t count)
+static ssize_t do_rbd_remove(const char *buf, size_t count)
 {
 	struct rbd_device *rbd_dev = NULL;
 	struct list_head *tmp;
@@ -7196,18 +7192,18 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
 	return count;
 }
 
-static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	if (single_major)
 		return -EINVAL;
 
-	return do_rbd_remove(bus, buf, count);
+	return do_rbd_remove(buf, count);
 }
 
-static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
+static ssize_t remove_single_major_store(const struct bus_type *bus, const char *buf,
 					 size_t count)
 {
-	return do_rbd_remove(bus, buf, count);
+	return do_rbd_remove(buf, count);
 }
 
 /*

drivers/bus/fsl-mc/fsl-mc-bus.c

@@ -231,7 +231,7 @@ static int scan_fsl_mc_bus(struct device *dev, void *data)
 	return 0;
 }
 
-static ssize_t rescan_store(struct bus_type *bus,
+static ssize_t rescan_store(const struct bus_type *bus,
 			    const char *buf, size_t count)
 {
 	unsigned long val;
@@ -284,7 +284,7 @@ static int fsl_mc_bus_get_autorescan(struct device *dev, void *data)
 	return 0;
 }
 
-static ssize_t autorescan_store(struct bus_type *bus,
+static ssize_t autorescan_store(const struct bus_type *bus,
 				const char *buf, size_t count)
 {
 	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan);
@@ -292,7 +292,7 @@ static ssize_t autorescan_store(struct bus_type *bus,
 	return count;
 }
 
-static ssize_t autorescan_show(struct bus_type *bus, char *buf)
+static ssize_t autorescan_show(const struct bus_type *bus, char *buf)
 {
 	bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan);
 	return strlen(buf);

drivers/cxl/core/port.c

@@ -1927,7 +1927,7 @@ bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd)
 EXPORT_SYMBOL_NS_GPL(schedule_cxl_memdev_detach, CXL);
 
 /* for user tooling to ensure port disable work has completed */
-static ssize_t flush_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t flush_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	if (sysfs_streq(buf, "1")) {
 		flush_workqueue(cxl_bus_wq);

drivers/hv/vmbus_drv.c

@@ -684,7 +684,7 @@ static const struct attribute_group vmbus_dev_group = {
 __ATTRIBUTE_GROUPS(vmbus_dev);
 
 /* Set up the attribute for /sys/bus/vmbus/hibernation */
-static ssize_t hibernation_show(struct bus_type *bus, char *buf)
+static ssize_t hibernation_show(const struct bus_type *bus, char *buf)
 {
 	return sprintf(buf, "%d\n", !!hv_is_hibernation_supported());
 }

drivers/net/netdevsim/bus.c

@@ -132,7 +132,7 @@ static struct nsim_bus_dev *
 nsim_bus_dev_new(unsigned int id, unsigned int port_count, unsigned int num_queues);
 
 static ssize_t
-new_device_store(struct bus_type *bus, const char *buf, size_t count)
+new_device_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	unsigned int id, port_count, num_queues;
 	struct nsim_bus_dev *nsim_bus_dev;
@@ -186,7 +186,7 @@ static BUS_ATTR_WO(new_device);
 static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);
 
 static ssize_t
-del_device_store(struct bus_type *bus, const char *buf, size_t count)
+del_device_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	struct nsim_bus_dev *nsim_bus_dev, *tmp;
 	unsigned int id;

drivers/pci/pci-sysfs.c

@@ -428,7 +428,7 @@ static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RW(msi_bus);
 
-static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t rescan_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	unsigned long val;
 	struct pci_bus *b = NULL;

drivers/pci/pci.c

@@ -6679,7 +6679,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 	}
 }
 
-static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
+static ssize_t resource_alignment_show(const struct bus_type *bus, char *buf)
 {
 	size_t count = 0;
 
@@ -6691,7 +6691,7 @@ static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
 	return count;
 }
 
-static ssize_t resource_alignment_store(struct bus_type *bus,
+static ssize_t resource_alignment_store(const struct bus_type *bus,
 					const char *buf, size_t count)
 {
 	char *param, *old, *end;

drivers/peci/sysfs.c

@@ -15,7 +15,7 @@ static int rescan_controller(struct device *dev, void *data)
 	return peci_controller_scan_devices(to_peci_controller(dev));
 }
 
-static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t rescan_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	bool res;
 	int ret;

drivers/rapidio/rio-sysfs.c

@@ -286,7 +286,7 @@ const struct attribute_group *rio_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t scan_store(struct bus_type *bus, const char *buf, size_t count)
+static ssize_t scan_store(const struct bus_type *bus, const char *buf, size_t count)
 {
 	long val;
 	int rc;

drivers/s390/crypto/ap_bus.c

@@ -1166,12 +1166,12 @@ EXPORT_SYMBOL(ap_parse_mask_str);
  * AP bus attributes.
  */
 
-static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
+static ssize_t ap_domain_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
 }
 
-static ssize_t ap_domain_store(struct bus_type *bus,
+static ssize_t ap_domain_store(const struct bus_type *bus,
 			       const char *buf, size_t count)
 {
 	int domain;
@@ -1193,7 +1193,7 @@ static ssize_t ap_domain_store(struct bus_type *bus,
 
 static BUS_ATTR_RW(ap_domain);
 
-static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
+static ssize_t ap_control_domain_mask_show(const struct bus_type *bus, char *buf)
 {
 	if (!ap_qci_info)	/* QCI not supported */
 		return scnprintf(buf, PAGE_SIZE, "not supported\n");
@@ -1208,7 +1208,7 @@ static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf)
 
 static BUS_ATTR_RO(ap_control_domain_mask);
 
-static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
+static ssize_t ap_usage_domain_mask_show(const struct bus_type *bus, char *buf)
 {
 	if (!ap_qci_info)	/* QCI not supported */
 		return scnprintf(buf, PAGE_SIZE, "not supported\n");
@@ -1223,7 +1223,7 @@ static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf)
 
 static BUS_ATTR_RO(ap_usage_domain_mask);
 
-static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
+static ssize_t ap_adapter_mask_show(const struct bus_type *bus, char *buf)
 {
 	if (!ap_qci_info)	/* QCI not supported */
 		return scnprintf(buf, PAGE_SIZE, "not supported\n");
@@ -1238,7 +1238,7 @@ static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf)
 
 static BUS_ATTR_RO(ap_adapter_mask);
 
-static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
+static ssize_t ap_interrupts_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n",
 			 ap_irq_flag ? 1 : 0);
@@ -1246,12 +1246,12 @@ static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
 
 static BUS_ATTR_RO(ap_interrupts);
 
-static ssize_t config_time_show(struct bus_type *bus, char *buf)
+static ssize_t config_time_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
 }
 
-static ssize_t config_time_store(struct bus_type *bus,
+static ssize_t config_time_store(const struct bus_type *bus,
 				 const char *buf, size_t count)
 {
 	int time;
@@ -1265,12 +1265,12 @@ static ssize_t config_time_store(struct bus_type *bus,
 
 static BUS_ATTR_RW(config_time);
 
-static ssize_t poll_thread_show(struct bus_type *bus, char *buf)
+static ssize_t poll_thread_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
 }
 
-static ssize_t poll_thread_store(struct bus_type *bus,
+static ssize_t poll_thread_store(const struct bus_type *bus,
 				 const char *buf, size_t count)
 {
 	int flag, rc;
@@ -1289,12 +1289,12 @@ static ssize_t poll_thread_store(struct bus_type *bus,
 
 static BUS_ATTR_RW(poll_thread);
 
-static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
+static ssize_t poll_timeout_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
 }
 
-static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
+static ssize_t poll_timeout_store(const struct bus_type *bus, const char *buf,
 				  size_t count)
 {
 	unsigned long long time;
@@ -1318,21 +1318,21 @@ static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
 
 static BUS_ATTR_RW(poll_timeout);
 
-static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
+static ssize_t ap_max_domain_id_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_domain_id);
 }
 
 static BUS_ATTR_RO(ap_max_domain_id);
 
-static ssize_t ap_max_adapter_id_show(struct bus_type *bus, char *buf)
+static ssize_t ap_max_adapter_id_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%d\n", ap_max_adapter_id);
 }
 
 static BUS_ATTR_RO(ap_max_adapter_id);
 
-static ssize_t apmask_show(struct bus_type *bus, char *buf)
+static ssize_t apmask_show(const struct bus_type *bus, char *buf)
 {
 	int rc;
 
@@ -1393,7 +1393,7 @@ static int apmask_commit(unsigned long *newapm)
 	return 0;
 }
 
-static ssize_t apmask_store(struct bus_type *bus, const char *buf,
+static ssize_t apmask_store(const struct bus_type *bus, const char *buf,
 			    size_t count)
 {
 	int rc, changes = 0;
@@ -1425,7 +1425,7 @@ static ssize_t apmask_store(struct bus_type *bus, const char *buf,
 
 static BUS_ATTR_RW(apmask);
 
-static ssize_t aqmask_show(struct bus_type *bus, char *buf)
+static ssize_t aqmask_show(const struct bus_type *bus, char *buf)
 {
 	int rc;
 
@@ -1486,7 +1486,7 @@ static int aqmask_commit(unsigned long *newaqm)
 	return 0;
 }
 
-static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
+static ssize_t aqmask_store(const struct bus_type *bus, const char *buf,
 			    size_t count)
 {
 	int rc, changes = 0;
@@ -1518,13 +1518,13 @@ static ssize_t aqmask_store(struct bus_type *bus, const char *buf,
 
 static BUS_ATTR_RW(aqmask);
 
-static ssize_t scans_show(struct bus_type *bus, char *buf)
+static ssize_t scans_show(const struct bus_type *bus, char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%llu\n",
 			 atomic64_read(&ap_scan_bus_count));
 }
 
-static ssize_t scans_store(struct bus_type *bus, const char *buf,
+static ssize_t scans_store(const struct bus_type *bus, const char *buf,
 			   size_t count)
 {
 	AP_DBF_INFO("%s force AP bus rescan\n", __func__);
@@ -1536,7 +1536,7 @@ static ssize_t scans_store(struct bus_type *bus, const char *buf,
 
 static BUS_ATTR_RW(scans);
 
-static ssize_t bindings_show(struct bus_type *bus, char *buf)
+static ssize_t bindings_show(const struct bus_type *bus, char *buf)
 {
 	int rc;
 	unsigned int apqns, n;

drivers/scsi/fcoe/fcoe_sysfs.c

@@ -659,17 +659,17 @@ static const struct device_type fcoe_fcf_device_type = {
 	.release = fcoe_fcf_device_release,
 };
 
-static ssize_t ctlr_create_store(struct bus_type *bus, const char *buf,
+static ssize_t ctlr_create_store(const struct bus_type *bus, const char *buf,
 				 size_t count)
 {
-	return fcoe_ctlr_create_store(bus, buf, count);
+	return fcoe_ctlr_create_store(buf, count);
 }
 static BUS_ATTR_WO(ctlr_create);
 
-static ssize_t ctlr_destroy_store(struct bus_type *bus, const char *buf,
+static ssize_t ctlr_destroy_store(const struct bus_type *bus, const char *buf,
 				  size_t count)
 {
-	return fcoe_ctlr_destroy_store(bus, buf, count);
+	return fcoe_ctlr_destroy_store(buf, count);
 }
 static BUS_ATTR_WO(ctlr_destroy);
 

drivers/scsi/fcoe/fcoe_transport.c

@@ -745,8 +745,7 @@ static int libfcoe_device_notification(struct notifier_block *notifier,
 	return NOTIFY_OK;
 }
 
-ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
-			       const char *buf, size_t count)
+ssize_t fcoe_ctlr_create_store(const char *buf, size_t count)
 {
 	struct net_device *netdev = NULL;
 	struct fcoe_transport *ft = NULL;
@@ -808,8 +807,7 @@ ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
 	return count;
 }
 
-ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus,
-				const char *buf, size_t count)
+ssize_t fcoe_ctlr_destroy_store(const char *buf, size_t count)
 {
 	int rc = -ENODEV;
 	struct net_device *netdev = NULL;

include/linux/device/bus.h

@@ -118,8 +118,8 @@ extern int __must_check bus_rescan_devices(struct bus_type *bus);
 
 struct bus_attribute {
 	struct attribute	attr;
-	ssize_t (*show)(struct bus_type *bus, char *buf);
-	ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
+	ssize_t (*show)(const struct bus_type *bus, char *buf);
+	ssize_t (*store)(const struct bus_type *bus, const char *buf, size_t count);
 };
 
 #define BUS_ATTR_RW(_name) \

include/scsi/libfcoe.h

@@ -397,10 +397,8 @@ int fcoe_transport_attach(struct fcoe_transport *ft);
 int fcoe_transport_detach(struct fcoe_transport *ft);
 
 /* sysfs store handler for ctrl_control interface */
-ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
-			       const char *buf, size_t count);
-ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus,
-				const char *buf, size_t count);
+ssize_t fcoe_ctlr_create_store(const char *buf, size_t count);
+ssize_t fcoe_ctlr_destroy_store(const char *buf, size_t count);
 
 #endif /* _LIBFCOE_H */