forked from Minki/linux
[SCSI] SCSI st: fix error handling in module init, sysfs
- Notice and handle sysfs errors in module init, tape init - Properly unwind errors in module init - Remove bogus st_sysfs_class==NULL test, it is guaranteed !NULL at that point Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Jeff Garzik
James Bottomley
parent
5e4009ba3d
commit
13026a6b98
@ -195,9 +195,9 @@ static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
|
||||
static int st_probe(struct device *);
|
||||
static int st_remove(struct device *);
|
||||
|
||||
static void do_create_driverfs_files(void);
|
||||
static int do_create_driverfs_files(void);
|
||||
static void do_remove_driverfs_files(void);
|
||||
static void do_create_class_files(struct scsi_tape *, int, int);
|
||||
static int do_create_class_files(struct scsi_tape *, int, int);
|
||||
|
||||
static struct scsi_driver st_template = {
|
||||
.owner = THIS_MODULE,
|
||||
@ -4048,7 +4048,9 @@ static int st_probe(struct device *dev)
|
||||
STm->cdevs[j] = cdev;
|
||||
|
||||
}
|
||||
do_create_class_files(tpnt, dev_num, mode);
|
||||
error = do_create_class_files(tpnt, dev_num, mode);
|
||||
if (error)
|
||||
goto out_free_tape;
|
||||
}
|
||||
|
||||
sdev_printk(KERN_WARNING, SDp,
|
||||
@ -4157,32 +4159,45 @@ static void scsi_tape_release(struct kref *kref)
|
||||
|
||||
static int __init init_st(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
validate_options();
|
||||
|
||||
printk(KERN_INFO
|
||||
"st: Version %s, fixed bufsize %d, s/g segs %d\n",
|
||||
printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
|
||||
verstr, st_fixed_buffer_size, st_max_sg_segs);
|
||||
|
||||
st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
|
||||
if (IS_ERR(st_sysfs_class)) {
|
||||
st_sysfs_class = NULL;
|
||||
printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
|
||||
return 1;
|
||||
return PTR_ERR(st_sysfs_class);
|
||||
}
|
||||
|
||||
if (!register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
|
||||
ST_MAX_TAPE_ENTRIES, "st")) {
|
||||
if (scsi_register_driver(&st_template.gendrv) == 0) {
|
||||
do_create_driverfs_files();
|
||||
return 0;
|
||||
}
|
||||
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
|
||||
ST_MAX_TAPE_ENTRIES);
|
||||
err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
|
||||
ST_MAX_TAPE_ENTRIES, "st");
|
||||
if (err) {
|
||||
printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
|
||||
SCSI_TAPE_MAJOR);
|
||||
goto err_class;
|
||||
}
|
||||
|
||||
err = scsi_register_driver(&st_template.gendrv);
|
||||
if (err)
|
||||
goto err_chrdev;
|
||||
|
||||
err = do_create_driverfs_files();
|
||||
if (err)
|
||||
goto err_scsidrv;
|
||||
|
||||
return 0;
|
||||
|
||||
err_scsidrv:
|
||||
scsi_unregister_driver(&st_template.gendrv);
|
||||
err_chrdev:
|
||||
unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
|
||||
ST_MAX_TAPE_ENTRIES);
|
||||
err_class:
|
||||
class_destroy(st_sysfs_class);
|
||||
|
||||
printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR);
|
||||
return 1;
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit exit_st(void)
|
||||
@ -4225,14 +4240,33 @@ static ssize_t st_version_show(struct device_driver *ddd, char *buf)
|
||||
}
|
||||
static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
|
||||
|
||||
static void do_create_driverfs_files(void)
|
||||
static int do_create_driverfs_files(void)
|
||||
{
|
||||
struct device_driver *driverfs = &st_template.gendrv;
|
||||
int err;
|
||||
|
||||
driver_create_file(driverfs, &driver_attr_try_direct_io);
|
||||
driver_create_file(driverfs, &driver_attr_fixed_buffer_size);
|
||||
driver_create_file(driverfs, &driver_attr_max_sg_segs);
|
||||
driver_create_file(driverfs, &driver_attr_version);
|
||||
err = driver_create_file(driverfs, &driver_attr_try_direct_io);
|
||||
if (err)
|
||||
return err;
|
||||
err = driver_create_file(driverfs, &driver_attr_fixed_buffer_size);
|
||||
if (err)
|
||||
goto err_try_direct_io;
|
||||
err = driver_create_file(driverfs, &driver_attr_max_sg_segs);
|
||||
if (err)
|
||||
goto err_attr_fixed_buf;
|
||||
err = driver_create_file(driverfs, &driver_attr_version);
|
||||
if (err)
|
||||
goto err_attr_max_sg;
|
||||
|
||||
return 0;
|
||||
|
||||
err_attr_max_sg:
|
||||
driver_remove_file(driverfs, &driver_attr_max_sg_segs);
|
||||
err_attr_fixed_buf:
|
||||
driver_remove_file(driverfs, &driver_attr_fixed_buffer_size);
|
||||
err_try_direct_io:
|
||||
driver_remove_file(driverfs, &driver_attr_try_direct_io);
|
||||
return err;
|
||||
}
|
||||
|
||||
static void do_remove_driverfs_files(void)
|
||||
@ -4293,15 +4327,12 @@ static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf)
|
||||
|
||||
CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
|
||||
|
||||
static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
|
||||
static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
|
||||
{
|
||||
int i, rew, error;
|
||||
char name[10];
|
||||
struct class_device *st_class_member;
|
||||
|
||||
if (!st_sysfs_class)
|
||||
return;
|
||||
|
||||
for (rew=0; rew < 2; rew++) {
|
||||
/* Make sure that the minor numbers corresponding to the four
|
||||
first modes always get the same names */
|
||||
@ -4316,18 +4347,24 @@ static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
|
||||
if (IS_ERR(st_class_member)) {
|
||||
printk(KERN_WARNING "st%d: class_device_create failed\n",
|
||||
dev_num);
|
||||
error = PTR_ERR(st_class_member);
|
||||
goto out;
|
||||
}
|
||||
class_set_devdata(st_class_member, &STp->modes[mode]);
|
||||
|
||||
class_device_create_file(st_class_member,
|
||||
&class_device_attr_defined);
|
||||
class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_blksize);
|
||||
class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_density);
|
||||
class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_compression);
|
||||
error = class_device_create_file(st_class_member,
|
||||
&class_device_attr_defined);
|
||||
if (error) goto out;
|
||||
error = class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_blksize);
|
||||
if (error) goto out;
|
||||
error = class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_density);
|
||||
if (error) goto out;
|
||||
error = class_device_create_file(st_class_member,
|
||||
&class_device_attr_default_compression);
|
||||
if (error) goto out;
|
||||
|
||||
if (mode == 0 && rew == 0) {
|
||||
error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
|
||||
&st_class_member->kobj,
|
||||
@ -4336,11 +4373,15 @@ static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
|
||||
printk(KERN_ERR
|
||||
"st%d: Can't create sysfs link from SCSI device.\n",
|
||||
dev_num);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
}
|
||||
out:
|
||||
return;
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
return error;
|
||||
}
|
||||
|
||||
/* The following functions may be useful for a larger audience. */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user