[PATCH 2/6] block: genhd: add 'groups' argument to device_add_disk

Hannes Reinecke
2018-07-30T07:12:23Z

Update device_add_disk() to take an 'groups' argument so that
individual drivers can register a device with additional sysfs
attributes.
This avoids race condition the driver would otherwise have if these
groups were to be created with sysfs_add_groups().

Signed-off-by: Martin Wilck <martin.wilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
---
arch/um/drivers/ubd_kern.c | 2 +-
block/genhd.c | 21 +++++++++++++++------
drivers/block/floppy.c | 2 +-
drivers/block/mtip32xx/mtip32xx.c | 2 +-
drivers/block/ps3disk.c | 2 +-
drivers/block/ps3vram.c | 2 +-
drivers/block/rsxx/dev.c | 2 +-
drivers/block/skd_main.c | 2 +-
drivers/block/sunvdc.c | 2 +-
drivers/block/virtio_blk.c | 2 +-
drivers/block/xen-blkfront.c | 2 +-
drivers/ide/ide-cd.c | 2 +-
drivers/ide/ide-gd.c | 2 +-
drivers/memstick/core/ms_block.c | 2 +-
drivers/memstick/core/mspro_block.c | 2 +-
drivers/mmc/core/block.c | 2 +-
drivers/mtd/mtd_blkdevs.c | 2 +-
drivers/nvdimm/blk.c | 2 +-
drivers/nvdimm/btt.c | 2 +-
drivers/nvdimm/pmem.c | 2 +-
drivers/nvme/host/core.c | 2 +-
drivers/nvme/host/multipath.c | 2 +-
drivers/s390/block/dasd_genhd.c | 2 +-
drivers/s390/block/dcssblk.c | 2 +-
drivers/s390/block/scm_blk.c | 2 +-
drivers/scsi/sd.c | 2 +-
drivers/scsi/sr.c | 2 +-
include/linux/genhd.h | 5 +++--
28 files changed, 44 insertions(+), 34 deletions(-)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 83c470364dfb..6ee4c56032f7 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -891,7 +891,7 @@ static int ubd_disk_register(int major, u64 size, int unit,

disk->private_data = &ubd_devs[unit];
disk->queue = ubd_devs[unit].queue;
- device_add_disk(parent, disk);
+ device_add_disk(parent, disk, NULL);

*disk_out = disk;
return 0;
diff --git a/block/genhd.c b/block/genhd.c
index 62aba3d8ae19..500c2e8d6345 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -567,7 +567,8 @@ static int exact_lock(dev_t devt, void *data)
return 0;
}

-static void register_disk(struct device *parent, struct gendisk *disk)
+static void register_disk(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups)
{
struct device *ddev = disk_to_dev(disk);
struct block_device *bdev;
@@ -582,6 +583,10 @@ static void register_disk(struct device *parent, struct gendisk *disk)
/* delay uevents, until we scanned partition table */
dev_set_uevent_suppress(ddev, 1);

+ if (groups) {
+ WARN_ON(ddev->groups);
+ ddev->groups = groups;
+ }
if (device_add(ddev))
return;
if (!sysfs_deprecated) {
@@ -647,13 +652,15 @@ static void register_disk(struct device *parent, struct gendisk *disk)
* __device_add_disk - add disk information to kernel list
* @parent: parent device for the disk
* @disk: per-device partitioning information
+ * @groups: Additional per-device sysfs groups
*
* This function registers the partitioning information in @disk
* with the kernel.
*
* FIXME: error handling
*/
-static void __device_add_disk(struct device *parent, struct gendisk *disk)
+static void __device_add_disk(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups)
{
dev_t devt;
int retval;
@@ -696,12 +703,13 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk)
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
}
- register_disk(parent, disk);
+ register_disk(parent, disk, groups);
}

-void device_add_disk(struct device *parent, struct gendisk *disk)
+void device_add_disk(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups)
{
- __device_add_disk(parent, disk);
+ __device_add_disk(parent, disk, groups);

blk_register_queue(disk);

@@ -718,7 +726,8 @@ EXPORT_SYMBOL(device_add_disk);

void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk)
{
- __device_add_disk(parent, disk);
+ __device_add_disk(parent, disk, NULL);
+
/*
* Take an extra ref on queue which will be put on disk_release()
* so that it sticks around as long as @disk is there.
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 48f622728ce6..1bc99e9dfaee 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4676,7 +4676,7 @@ static int __init do_floppy_init(void)
/* to be cleaned up... */
disks[drive]->private_data = (void *)(long)drive;
disks[drive]->flags |= GENHD_FL_REMOVABLE;
- device_add_disk(&floppy_device[drive].dev, disks[drive]);
+ device_add_disk(&floppy_device[drive].dev, disks[drive], NULL);
}

return 0;
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index c73626decb46..ac3b19ad8544 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3873,7 +3873,7 @@ static int mtip_block_initialize(struct driver_data *dd)
set_capacity(dd->disk, capacity);

/* Enable the block device and add it to /dev */
- device_add_disk(&dd->pdev->dev, dd->disk);
+ device_add_disk(&dd->pdev->dev, dd->disk, NULL);

dd->bdev = bdget_disk(dd->disk, 0);
/*
diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
index afe1508d82c6..29a4419e8ba3 100644
--- a/drivers/block/ps3disk.c
+++ b/drivers/block/ps3disk.c
@@ -500,7 +500,7 @@ static int ps3disk_probe(struct ps3_system_bus_device *_dev)
gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
get_capacity(gendisk) >> 11);

- device_add_disk(&dev->sbd.core, gendisk);
+ device_add_disk(&dev->sbd.core, gendisk, NULL);
return 0;

fail_cleanup_queue:
diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c
index 1e3d5de9d838..c0c50816a10b 100644
--- a/drivers/block/ps3vram.c
+++ b/drivers/block/ps3vram.c
@@ -769,7 +769,7 @@ static int ps3vram_probe(struct ps3_system_bus_device *dev)
dev_info(&dev->core, "%s: Using %lu MiB of GPU memory\n",
gendisk->disk_name, get_capacity(gendisk) >> 11);

- device_add_disk(&dev->core, gendisk);
+ device_add_disk(&dev->core, gendisk, NULL);
return 0;

fail_cleanup_queue:
diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c
index 1a92f9e65937..3894aa0f350b 100644
--- a/drivers/block/rsxx/dev.c
+++ b/drivers/block/rsxx/dev.c
@@ -226,7 +226,7 @@ int rsxx_attach_dev(struct rsxx_cardinfo *card)
set_capacity(card->gendisk, card->size8 >> 9);
else
set_capacity(card->gendisk, 0);
- device_add_disk(CARD_TO_DEV(card), card->gendisk);
+ device_add_disk(CARD_TO_DEV(card), card->gendisk, NULL);
card->bdev_attached = 1;
}

diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index 87b9e7fbf062..a85c9a622c41 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -3104,7 +3104,7 @@ static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
static int skd_bdev_attach(struct device *parent, struct skd_device *skdev)
{
dev_dbg(&skdev->pdev->dev, "add_disk\n");
- device_add_disk(parent, skdev->disk);
+ device_add_disk(parent, skdev->disk, NULL);
return 0;
}

diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 5ca56bfae63c..09409edce384 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -850,7 +850,7 @@ static int probe_disk(struct vdc_port *port)
port->vdisk_size, (port->vdisk_size >> (20 - 9)),
port->vio.ver.major, port->vio.ver.minor);

- device_add_disk(&port->vio.vdev->dev, g);
+ device_add_disk(&port->vio.vdev->dev, g, NULL);

return 0;
}
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 23752dc99b00..fe80560000a1 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -780,7 +780,7 @@ static int virtblk_probe(struct virtio_device *vdev)
virtblk_update_capacity(vblk, false);
virtio_device_ready(vdev);

- device_add_disk(&vdev->dev, vblk->disk);
+ device_add_disk(&vdev->dev, vblk->disk, NULL);
err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
if (err)
goto out_del_disk;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index b5cedccb5d7d..020f570072cf 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2402,7 +2402,7 @@ static void blkfront_connect(struct blkfront_info *info)
for (i = 0; i < info->nr_rings; i++)
kick_pending_request_queues(&info->rinfo[i]);

- device_add_disk(&info->xbdev->dev, info->gd);
+ device_add_disk(&info->xbdev->dev, info->gd, NULL);

info->is_ready = 1;
return;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 5f178384876f..d9b42ad7253b 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1788,7 +1788,7 @@ static int ide_cd_probe(ide_drive_t *drive)
ide_cd_read_toc(drive, &sense);
g->fops = &idecd_ops;
g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
- device_add_disk(&drive->gendev, g);
+ device_add_disk(&drive->gendev, g, NULL);
return 0;

out_free_disk:
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
index e823394ed543..04e008e8f6f9 100644
--- a/drivers/ide/ide-gd.c
+++ b/drivers/ide/ide-gd.c
@@ -416,7 +416,7 @@ static int ide_gd_probe(ide_drive_t *drive)
if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
g->flags = GENHD_FL_REMOVABLE;
g->fops = &ide_gd_ops;
- device_add_disk(&drive->gendev, g);
+ device_add_disk(&drive->gendev, g, NULL);
return 0;

out_free_disk:
diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index 716fc8ed31d3..8a02f11076f9 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -2146,7 +2146,7 @@ static int msb_init_disk(struct memstick_dev *card)
set_disk_ro(msb->disk, 1);

msb_start(card);
- device_add_disk(&card->dev, msb->disk);
+ device_add_disk(&card->dev, msb->disk, NULL);
dbg("Disk added");
return 0;

diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
index 5ee932631fae..0cd30dcb6801 100644
--- a/drivers/memstick/core/mspro_block.c
+++ b/drivers/memstick/core/mspro_block.c
@@ -1236,7 +1236,7 @@ static int mspro_block_init_disk(struct memstick_dev *card)
set_capacity(msb->disk, capacity);
dev_dbg(&card->dev, "capacity set %ld\n", capacity);

- device_add_disk(&card->dev, msb->disk);
+ device_add_disk(&card->dev, msb->disk, NULL);
msb->active = 1;
return 0;

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index a0b9102c4c6e..de8e1a8be690 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2698,7 +2698,7 @@ static int mmc_add_disk(struct mmc_blk_data *md)
int ret;
struct mmc_card *card = md->queue.card;

- device_add_disk(md->parent, md->disk);
+ device_add_disk(md->parent, md->disk, NULL);
md->force_ro.show = force_ro_show;
md->force_ro.store = force_ro_store;
sysfs_attr_init(&md->force_ro.attr);
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 29c0bfd74e8a..6a41dfa3c36b 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -447,7 +447,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
if (new->readonly)
set_disk_ro(gd, 1);

- device_add_disk(&new->mtd->dev, gd);
+ device_add_disk(&new->mtd->dev, gd, NULL);

if (new->disk_attributes) {
ret = sysfs_create_group(&disk_to_dev(gd)->kobj,
diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
index 62e9cb167aad..db45c6bbb7bb 100644
--- a/drivers/nvdimm/blk.c
+++ b/drivers/nvdimm/blk.c
@@ -290,7 +290,7 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk)
}

set_capacity(disk, available_disk_size >> SECTOR_SHIFT);
- device_add_disk(dev, disk);
+ device_add_disk(dev, disk, NULL);
revalidate_disk(disk);
return 0;
}
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 0360c015f658..b123b0dcf274 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1556,7 +1556,7 @@ static int btt_blk_init(struct btt *btt)
}
}
set_capacity(btt->btt_disk, btt->nlba * btt->sector_size >> 9);
- device_add_disk(&btt->nd_btt->dev, btt->btt_disk);
+ device_add_disk(&btt->nd_btt->dev, btt->btt_disk, NULL);
btt->nd_btt->size = btt->nlba * (u64)btt->sector_size;
revalidate_disk(btt->btt_disk);

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index dd17acd8fe68..dad84a1d23db 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -445,7 +445,7 @@ static int pmem_attach_disk(struct device *dev,
gendev = disk_to_dev(disk);
gendev->groups = pmem_attribute_groups;

- device_add_disk(dev, disk);
+ device_add_disk(dev, disk, NULL);
if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
return -ENOMEM;

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e482f223f8fd..f1b61ebceaf1 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3061,7 +3061,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)

nvme_get_ctrl(ctrl);

- device_add_disk(ctrl->device, ns->disk);
+ device_add_disk(ctrl->device, ns->disk, NULL);
if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
&nvme_ns_id_attr_group))
pr_warn("%s: failed to create sysfs group for identification\n",
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 2c131340b813..e4d786467129 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -282,7 +282,7 @@ static void nvme_mpath_set_live(struct nvme_ns *ns)
return;

if (!(head->disk->flags & GENHD_FL_UP)) {
- device_add_disk(&head->subsys->dev, head->disk);
+ device_add_disk(&head->subsys->dev, head->disk, NULL);
if (sysfs_create_group(&disk_to_dev(head->disk)->kobj,
&nvme_ns_id_attr_group))
dev_warn(&head->subsys->dev,
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c
index 7036a6c6f86f..5542d9eadfe0 100644
--- a/drivers/s390/block/dasd_genhd.c
+++ b/drivers/s390/block/dasd_genhd.c
@@ -76,7 +76,7 @@ int dasd_gendisk_alloc(struct dasd_block *block)
gdp->queue = block->request_queue;
block->gdp = gdp;
set_capacity(block->gdp, 0);
- device_add_disk(&base->cdev->dev, block->gdp);
+ device_add_disk(&base->cdev->dev, block->gdp, NULL);
return 0;
}

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index ed607288e696..a0738c6c4eab 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -685,7 +685,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
}

get_device(&dev_info->dev);
- device_add_disk(&dev_info->dev, dev_info->gd);
+ device_add_disk(&dev_info->dev, dev_info->gd, NULL);

switch (dev_info->segment_type) {
case SEG_TYPE_SR:
diff --git a/drivers/s390/block/scm_blk.c b/drivers/s390/block/scm_blk.c
index b1fcb76dd272..7559ac40f01b 100644
--- a/drivers/s390/block/scm_blk.c
+++ b/drivers/s390/block/scm_blk.c
@@ -499,7 +499,7 @@ int scm_blk_dev_setup(struct scm_blk_dev *bdev, struct scm_device *scmdev)

/* 512 byte sectors */
set_capacity(bdev->gendisk, scmdev->size >> 9);
- device_add_disk(&scmdev->dev, bdev->gendisk);
+ device_add_disk(&scmdev->dev, bdev->gendisk, NULL);
return 0;

out_queue:
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 9421d9877730..cc80a3d2cd1a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3271,7 +3271,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
}

blk_pm_runtime_init(sdp->request_queue, dev);
- device_add_disk(dev, gd);
+ device_add_disk(dev, gd, NULL);
if (sdkp->capacity)
sd_dif_config_host(sdkp);

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 3f3cb72e0c0c..f628b04e0920 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -745,7 +745,7 @@ static int sr_probe(struct device *dev)

dev_set_drvdata(dev, cd);
disk->flags |= GENHD_FL_REMOVABLE;
- device_add_disk(&sdev->sdev_gendev, disk);
+ device_add_disk(&sdev->sdev_gendev, disk, NULL);

sdev_printk(KERN_DEBUG, sdev,
"Attached scsi CD-ROM %s\n", cd->cdi.name);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 57864422a2c8..0b820ff05839 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -399,10 +399,11 @@ static inline void free_part_info(struct hd_struct *part)
extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);

/* block/genhd.c */
-extern void device_add_disk(struct device *parent, struct gendisk *disk);
+extern void device_add_disk(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups);
static inline void add_disk(struct gendisk *disk)
{
- device_add_disk(NULL, disk);
+ device_add_disk(NULL, disk, NULL);
}
extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
static inline void add_disk_no_queue_reg(struct gendisk *disk)
--
2.12.3