Hello Greg,

On Fri, 25 Nov 2022 at 17:25, Mauro Carvalho Chehab mchehab@kernel.org wrote:

Em Wed, 23 Nov 2022 13:25:20 +0100 Greg Kroah-Hartman gregkh@linuxfoundation.org escreveu:

...

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.

Acked-by: Mauro Carvalho Chehab mchehab@kernel.org

...

Please feel free to add my Acked-by: Sumit Semwal sumit.semwal@linaro.org for the dma-buf portion.

Best, Sumit.

...

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;