[PATCH 2/5] driver core: make struct class.devnode() take a const *

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

The devnode() in struct class should not be modifying the device that is
passed into it, so mark it as a const * and propagate the function
signature changes out into all relevant subsystems that use this
callback.

Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Justin Sanders <justin@coraid.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: John Stultz <jstultz@google.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Sean Young <sean@mess.org>
Cc: Frank Haverkamp <haver@linux.ibm.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Xie Yongji <xieyongji@bytedance.com>
Cc: Gautam Dawar <gautam.dawar@xilinx.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Eli Cohen <elic@nvidia.com>
Cc: Parav Pandit <parav@nvidia.com>
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: alsa-devel@alsa-project.org
Cc: dri-devel@lists.freedesktop.org
Cc: kvm@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: linux-block@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org
Cc: linux-rdma@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c  | 4 ++--
 arch/x86/kernel/cpuid.c                    | 2 +-
 arch/x86/kernel/msr.c                      | 2 +-
 block/bsg.c                                | 2 +-
 drivers/block/aoe/aoechr.c                 | 2 +-
 drivers/char/mem.c                         | 2 +-
 drivers/char/misc.c                        | 4 ++--
 drivers/dma-buf/dma-heap.c                 | 2 +-
 drivers/gpu/drm/drm_sysfs.c                | 2 +-
 drivers/infiniband/core/user_mad.c         | 2 +-
 drivers/infiniband/core/uverbs_main.c      | 2 +-
 drivers/infiniband/hw/hfi1/device.c        | 4 ++--
 drivers/input/input.c                      | 2 +-
 drivers/media/dvb-core/dvbdev.c            | 4 ++--
 drivers/media/pci/ddbridge/ddbridge-core.c | 4 ++--
 drivers/media/rc/rc-main.c                 | 2 +-
 drivers/misc/genwqe/card_base.c            | 2 +-
 drivers/tty/tty_io.c                       | 2 +-
 drivers/usb/core/file.c                    | 2 +-
 drivers/vdpa/vdpa_user/vduse_dev.c         | 2 +-
 drivers/vfio/vfio_main.c                   | 2 +-
 fs/pstore/pmsg.c                           | 2 +-
 include/linux/device/class.h               | 2 +-
 sound/sound_core.c                         | 2 +-
 24 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index d961ae3ed96e..4e4231a58f38 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -1560,9 +1560,9 @@ static const struct file_operations pseudo_lock_dev_fops = {
 	.mmap =		pseudo_lock_dev_mmap,
 };
 
-static char *pseudo_lock_devnode(struct device *dev, umode_t *mode)
+static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
 {
-	struct rdtgroup *rdtgrp;
+	const struct rdtgroup *rdtgrp;
 
 	rdtgrp = dev_get_drvdata(dev);
 	if (mode)
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
index 6f7b8cc1bc9f..621ba9c0f17a 100644
--- a/arch/x86/kernel/cpuid.c
+++ b/arch/x86/kernel/cpuid.c
@@ -139,7 +139,7 @@ static int cpuid_device_destroy(unsigned int cpu)
 	return 0;
 }
 
-static char *cpuid_devnode(struct device *dev, umode_t *mode)
+static char *cpuid_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));
 }
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index ed8ac6bcbafb..708751311786 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -250,7 +250,7 @@ static int msr_device_destroy(unsigned int cpu)
 	return 0;
 }
 
-static char *msr_devnode(struct device *dev, umode_t *mode)
+static char *msr_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "cpu/%u/msr", MINOR(dev->devt));
 }
diff --git a/block/bsg.c b/block/bsg.c
index 2ab1351eb082..08046bd9207d 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -232,7 +232,7 @@ struct bsg_device *bsg_register_queue(struct request_queue *q,
 }
 EXPORT_SYMBOL_GPL(bsg_register_queue);
 
-static char *bsg_devnode(struct device *dev, umode_t *mode)
+static char *bsg_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev));
 }
diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 8eea2529da20..7a368c90467d 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -273,7 +273,7 @@ static const struct file_operations aoe_fops = {
 	.llseek = noop_llseek,
 };
 
-static char *aoe_devnode(struct device *dev, umode_t *mode)
+static char *aoe_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "etherd/%s", dev_name(dev));
 }
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 5611d127363e..83bf2a4dcb57 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -746,7 +746,7 @@ static const struct file_operations memory_fops = {
 	.llseek = noop_llseek,
 };
 
-static char *mem_devnode(struct device *dev, umode_t *mode)
+static char *mem_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode && devlist[MINOR(dev->devt)].mode)
 		*mode = devlist[MINOR(dev->devt)].mode;
diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index cba19bfdc44d..88c6995b9a3d 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -254,9 +254,9 @@ void misc_deregister(struct miscdevice *misc)
 }
 EXPORT_SYMBOL(misc_deregister);
 
-static char *misc_devnode(struct device *dev, umode_t *mode)
+static char *misc_devnode(const struct device *dev, umode_t *mode)
 {
-	struct miscdevice *c = dev_get_drvdata(dev);
+	const struct miscdevice *c = dev_get_drvdata(dev);
 
 	if (mode && c->mode)
 		*mode = c->mode;
diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index 8f5848aa144f..4d7150791315 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -299,7 +299,7 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 	return err_ret;
 }
 
-static char *dma_heap_devnode(struct device *dev, umode_t *mode)
+static char *dma_heap_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
 }
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 430e00b16eec..14bf156b3f1b 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -90,7 +90,7 @@ static void drm_sysfs_acpi_register(void) { }
 static void drm_sysfs_acpi_unregister(void) { }
 #endif
 
-static char *drm_devnode(struct device *dev, umode_t *mode)
+static char *drm_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
 }
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index 98cb594cd9a6..f83954180a33 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -1224,7 +1224,7 @@ static struct attribute *umad_class_dev_attrs[] = {
 };
 ATTRIBUTE_GROUPS(umad_class_dev);
 
-static char *umad_devnode(struct device *dev, umode_t *mode)
+static char *umad_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 }
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index d54434088727..bdb179a09d77 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -1237,7 +1237,7 @@ static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
 	put_device(&uverbs_dev->dev);
 }
 
-static char *uverbs_devnode(struct device *dev, umode_t *mode)
+static char *uverbs_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0666;
diff --git a/drivers/infiniband/hw/hfi1/device.c b/drivers/infiniband/hw/hfi1/device.c
index 8ceff7141baf..1f4496032170 100644
--- a/drivers/infiniband/hw/hfi1/device.c
+++ b/drivers/infiniband/hw/hfi1/device.c
@@ -72,7 +72,7 @@ const char *class_name(void)
 	return hfi1_class_name;
 }
 
-static char *hfi1_devnode(struct device *dev, umode_t *mode)
+static char *hfi1_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0600;
@@ -85,7 +85,7 @@ static const char *class_name_user(void)
 	return hfi1_class_name_user;
 }
 
-static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
+static char *hfi1_user_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0666;
diff --git a/drivers/input/input.c b/drivers/input/input.c
index ebb2b7f0f8ff..50597165dc54 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1913,7 +1913,7 @@ static const struct device_type input_dev_type = {
 #endif
 };
 
-static char *input_devnode(struct device *dev, umode_t *mode)
+static char *input_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
 }
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index 6ef18bab9648..e73f5240cc2c 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -1018,9 +1018,9 @@ static int dvb_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-static char *dvb_devnode(struct device *dev, umode_t *mode)
+static char *dvb_devnode(const struct device *dev, umode_t *mode)
 {
-	struct dvb_device *dvbdev = dev_get_drvdata(dev);
+	const struct dvb_device *dvbdev = dev_get_drvdata(dev);
 
 	return kasprintf(GFP_KERNEL, "dvb/adapter%d/%s%d",
 		dvbdev->adapter->num, dnames[dvbdev->type], dvbdev->id);
diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c b/drivers/media/pci/ddbridge/ddbridge-core.c
index fe833f39698a..ee8087f29b2c 100644
--- a/drivers/media/pci/ddbridge/ddbridge-core.c
+++ b/drivers/media/pci/ddbridge/ddbridge-core.c
@@ -2716,9 +2716,9 @@ static const struct file_operations ddb_fops = {
 	.release        = ddb_release,
 };
 
-static char *ddb_devnode(struct device *device, umode_t *mode)
+static char *ddb_devnode(const struct device *device, umode_t *mode)
 {
-	struct ddb *dev = dev_get_drvdata(device);
+	const struct ddb *dev = dev_get_drvdata(device);
 
 	return kasprintf(GFP_KERNEL, "ddbridge/card%d", dev->nr);
 }
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index eba0cd30e314..527d9324742b 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1017,7 +1017,7 @@ static void ir_close(struct input_dev *idev)
 }
 
 /* class for /sys/class/rc */
-static char *rc_devnode(struct device *dev, umode_t *mode)
+static char *rc_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
 }
diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c
index 693981891870..0f00687f72d4 100644
--- a/drivers/misc/genwqe/card_base.c
+++ b/drivers/misc/genwqe/card_base.c
@@ -1349,7 +1349,7 @@ static struct pci_driver genwqe_driver = {
  * Default mode should be rw for everybody. Do not change default
  * device name.
  */
-static char *genwqe_devnode(struct device *dev, umode_t *mode)
+static char *genwqe_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0666;
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index de06c3c2ff70..aad8171f6c21 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3494,7 +3494,7 @@ void tty_default_fops(struct file_operations *fops)
 	*fops = tty_fops;
 }
 
-static char *tty_devnode(struct device *dev, umode_t *mode)
+static char *tty_devnode(const struct device *dev, umode_t *mode)
 {
 	if (!mode)
 		return NULL;
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 558890ada0e5..da7d88e069e6 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -62,7 +62,7 @@ static struct usb_class {
 	struct class *class;
 } *usb_class;
 
-static char *usb_devnode(struct device *dev, umode_t *mode)
+static char *usb_devnode(const struct device *dev, umode_t *mode)
 {
 	struct usb_class_driver *drv;
 
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 35dceee3ed56..0dd3c1f291da 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1656,7 +1656,7 @@ static const struct file_operations vduse_ctrl_fops = {
 	.llseek		= noop_llseek,
 };
 
-static char *vduse_devnode(struct device *dev, umode_t *mode)
+static char *vduse_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "vduse/%s", dev_name(dev));
 }
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 6e8804fe0095..5bf4b3454918 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -1812,7 +1812,7 @@ EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare);
 /*
  * Module/class support
  */
-static char *vfio_devnode(struct device *dev, umode_t *mode)
+static char *vfio_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
 }
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index d8542ec2f38c..b31c9c72d90b 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -46,7 +46,7 @@ static int pmsg_major;
 #undef pr_fmt
 #define pr_fmt(fmt) PMSG_NAME ": " fmt
 
-static char *pmsg_devnode(struct device *dev, umode_t *mode)
+static char *pmsg_devnode(const struct device *dev, umode_t *mode)
 {
 	if (mode)
 		*mode = 0220;
diff --git a/include/linux/device/class.h b/include/linux/device/class.h
index 94b1107258e5..42cc3fb44a84 100644
--- a/include/linux/device/class.h
+++ b/include/linux/device/class.h
@@ -60,7 +60,7 @@ struct class {
 	struct kobject			*dev_kobj;
 
 	int (*dev_uevent)(const struct device *dev, struct kobj_uevent_env *env);
-	char *(*devnode)(struct device *dev, umode_t *mode);
+	char *(*devnode)(const struct device *dev, umode_t *mode);
 
 	void (*class_release)(struct class *class);
 	void (*dev_release)(struct device *dev);
diff --git a/sound/sound_core.c b/sound/sound_core.c
index 3332fe321737..3e7dd6fcb7cf 100644
--- a/sound/sound_core.c
+++ b/sound/sound_core.c
@@ -30,7 +30,7 @@ MODULE_DESCRIPTION("Core sound module");
 MODULE_AUTHOR("Alan Cox");
 MODULE_LICENSE("GPL");
 
-static char *sound_devnode(struct device *dev, umode_t *mode)
+static char *sound_devnode(const struct device *dev, umode_t *mode)
 {
 	if (MAJOR(dev->devt) == SOUND_MAJOR)
 		return NULL;
-- 
2.38.1