提交 26898afd 编写于 作者: J Jeff Mahoney 提交者: James Bottomley

[SCSI] st: clean up device file creation and removal

This patch cleans up the st device file creation and removal.
Reviewed-by: NLee Duncan <lduncan@suse.com>
Signed-off-by: NJeff Mahoney <jeffm@suse.com>
Acked-by: NKai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
上级 6c648d95
......@@ -193,7 +193,6 @@ static int st_remove(struct device *);
static int do_create_sysfs_files(void);
static void do_remove_sysfs_files(void);
static int do_create_class_files(struct scsi_tape *, int, int);
static struct scsi_driver st_template = {
.owner = THIS_MODULE,
......@@ -3990,16 +3989,98 @@ static const struct file_operations st_fops =
.llseek = noop_llseek,
};
static int create_one_cdev(struct scsi_tape *tape, int mode, int rew)
{
int i, error;
dev_t cdev_devno;
struct cdev *cdev;
struct device *dev;
struct st_modedef *STm = &(tape->modes[mode]);
char name[10];
int dev_num = tape->index;
cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew));
cdev = cdev_alloc();
if (!cdev) {
pr_err("st%d: out of memory. Device not attached.\n", dev_num);
error = -ENOMEM;
goto out;
}
cdev->owner = THIS_MODULE;
cdev->ops = &st_fops;
error = cdev_add(cdev, cdev_devno, 1);
if (error) {
pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num,
rew ? "non" : "auto", mode);
pr_err("st%d: Device not attached.\n", dev_num);
goto out_free;
}
STm->cdevs[rew] = cdev;
i = mode << (4 - ST_NBR_MODE_BITS);
snprintf(name, 10, "%s%s%s", rew ? "n" : "",
tape->disk->disk_name, st_formats[i]);
dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev,
cdev_devno, &tape->modes[mode], "%s", name);
if (IS_ERR(dev)) {
pr_err("st%d: device_create failed\n", dev_num);
error = PTR_ERR(dev);
goto out_free;
}
STm->devs[rew] = dev;
return 0;
out_free:
cdev_del(STm->cdevs[rew]);
STm->cdevs[rew] = NULL;
out:
return error;
}
static int create_cdevs(struct scsi_tape *tape)
{
int mode, error;
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
error = create_one_cdev(tape, mode, 0);
if (error)
return error;
error = create_one_cdev(tape, mode, 1);
if (error)
return error;
}
return sysfs_create_link(&tape->device->sdev_gendev.kobj,
&tape->modes[0].devs[0]->kobj, "tape");
}
static void remove_cdevs(struct scsi_tape *tape)
{
int mode, rew;
sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape");
for (mode = 0; mode < ST_NBR_MODES; mode++) {
struct st_modedef *STm = &(tape->modes[mode]);
for (rew = 0; rew < 2; rew++) {
if (STm->cdevs[rew])
cdev_del(STm->cdevs[rew]);
if (STm->devs[rew])
device_unregister(STm->devs[rew]);
}
}
}
static int st_probe(struct device *dev)
{
struct scsi_device *SDp = to_scsi_device(dev);
struct gendisk *disk = NULL;
struct cdev *cdev = NULL;
struct scsi_tape *tpnt = NULL;
struct st_modedef *STm;
struct st_partstat *STps;
struct st_buffer *buffer;
int i, j, mode, dev_num, error;
int i, dev_num, error;
char *stp;
if (SDp->type != TYPE_TAPE)
......@@ -4125,36 +4206,10 @@ static int st_probe(struct device *dev)
dev_set_drvdata(dev, tpnt);
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
STm = &(tpnt->modes[mode]);
for (j=0; j < 2; j++) {
cdev = cdev_alloc();
if (!cdev) {
printk(KERN_ERR
"st%d: out of memory. Device not attached.\n",
dev_num);
cdev_del(cdev);
goto out_free_tape;
}
cdev->owner = THIS_MODULE;
cdev->ops = &st_fops;
error = cdev_add(cdev,
MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, j)),
1);
if (error) {
printk(KERN_ERR "st%d: Can't add %s-rewind mode %d\n",
dev_num, j ? "non" : "auto", mode);
printk(KERN_ERR "st%d: Device not attached.\n", dev_num);
goto out_free_tape;
}
STm->cdevs[j] = cdev;
}
error = do_create_class_files(tpnt, dev_num, mode);
if (error)
goto out_free_tape;
}
error = create_cdevs(tpnt);
if (error)
goto out_remove_devs;
scsi_autopm_put_device(SDp);
sdev_printk(KERN_NOTICE, SDp,
......@@ -4165,20 +4220,8 @@ static int st_probe(struct device *dev)
return 0;
out_free_tape:
sysfs_remove_link(&tpnt->device->sdev_gendev.kobj,
"tape");
for (mode=0; mode < ST_NBR_MODES; mode++) {
STm = &(tpnt->modes[mode]);
for (j=0; j < 2; j++) {
if (STm->cdevs[j]) {
device_destroy(&st_sysfs_class,
MKDEV(SCSI_TAPE_MAJOR,
TAPE_MINOR(i, mode, j)));
cdev_del(STm->cdevs[j]);
}
}
}
out_remove_devs:
remove_cdevs(tpnt);
out_put_index:
spin_lock(&st_index_lock);
idr_remove(&st_index_idr, dev_num);
......@@ -4196,24 +4239,10 @@ static int st_probe(struct device *dev)
static int st_remove(struct device *dev)
{
struct scsi_tape *tpnt = dev_get_drvdata(dev);
int rew, mode;
dev_t cdev_devno;
struct cdev *cdev;
int index = tpnt->index;
scsi_autopm_get_device(to_scsi_device(dev));
sysfs_remove_link(&tpnt->device->sdev_gendev.kobj, "tape");
for (mode = 0; mode < ST_NBR_MODES; ++mode) {
for (rew = 0; rew < 2; rew++) {
cdev = tpnt->modes[mode].cdevs[rew];
if (!cdev)
continue;
cdev_devno = cdev->dev;
device_destroy(&st_sysfs_class, cdev_devno);
cdev_del(tpnt->modes[mode].cdevs[rew]);
tpnt->modes[mode].cdevs[rew] = NULL;
}
}
remove_cdevs(tpnt);
mutex_lock(&st_ref_mutex);
kref_put(&tpnt->kref, scsi_tape_release);
......@@ -4462,50 +4491,6 @@ static struct device_attribute st_dev_attrs[] = {
__ATTR_NULL,
};
static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
{
int i, rew, error;
char name[10];
struct device *st_class_member;
for (rew=0; rew < 2; rew++) {
/* Make sure that the minor numbers corresponding to the four
first modes always get the same names */
i = mode << (4 - ST_NBR_MODE_BITS);
snprintf(name, 10, "%s%s%s", rew ? "n" : "",
STp->disk->disk_name, st_formats[i]);
st_class_member =
device_create(&st_sysfs_class,
&STp->device->sdev_gendev,
MKDEV(SCSI_TAPE_MAJOR,
TAPE_MINOR(dev_num, mode, rew)),
&STp->modes[mode], "%s", name);
if (IS_ERR(st_class_member)) {
printk(KERN_WARNING "st%d: device_create failed\n",
dev_num);
error = PTR_ERR(st_class_member);
goto out;
}
if (mode == 0 && rew == 0) {
error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
&st_class_member->kobj,
"tape");
if (error) {
printk(KERN_ERR
"st%d: Can't create sysfs link from SCSI device.\n",
dev_num);
goto out;
}
}
}
return 0;
out:
return error;
}
/* The following functions may be useful for a larger audience. */
static int sgl_map_user_pages(struct st_buffer *STbp,
const unsigned int max_pages, unsigned long uaddr,
......
......@@ -67,6 +67,7 @@ struct st_modedef {
short default_density; /* Forced density, -1 = no value */
int default_blksize; /* Forced blocksize, -1 = no value */
struct scsi_tape *tape;
struct device *devs[2]; /* Auto-rewind and non-rewind devices */
struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
};
......
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