mirror of https://gitee.com/openkylin/linux.git
[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
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@ -195,9 +195,9 @@ static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
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static int st_probe(struct device *);
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static int st_remove(struct device *);
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static void do_create_driverfs_files(void);
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static int do_create_driverfs_files(void);
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static void do_remove_driverfs_files(void);
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static void do_create_class_files(struct scsi_tape *, int, int);
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static int do_create_class_files(struct scsi_tape *, int, int);
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static struct scsi_driver st_template = {
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.owner = THIS_MODULE,
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@ -4048,7 +4048,9 @@ static int st_probe(struct device *dev)
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STm->cdevs[j] = cdev;
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}
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do_create_class_files(tpnt, dev_num, mode);
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error = do_create_class_files(tpnt, dev_num, mode);
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if (error)
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goto out_free_tape;
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}
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sdev_printk(KERN_WARNING, SDp,
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@ -4157,32 +4159,45 @@ static void scsi_tape_release(struct kref *kref)
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static int __init init_st(void)
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{
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int err;
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validate_options();
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printk(KERN_INFO
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"st: Version %s, fixed bufsize %d, s/g segs %d\n",
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printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n",
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verstr, st_fixed_buffer_size, st_max_sg_segs);
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st_sysfs_class = class_create(THIS_MODULE, "scsi_tape");
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if (IS_ERR(st_sysfs_class)) {
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st_sysfs_class = NULL;
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printk(KERN_ERR "Unable create sysfs class for SCSI tapes\n");
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return 1;
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return PTR_ERR(st_sysfs_class);
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}
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if (!register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
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ST_MAX_TAPE_ENTRIES, "st")) {
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if (scsi_register_driver(&st_template.gendrv) == 0) {
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do_create_driverfs_files();
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return 0;
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}
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unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
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ST_MAX_TAPE_ENTRIES);
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err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
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ST_MAX_TAPE_ENTRIES, "st");
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if (err) {
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printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",
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SCSI_TAPE_MAJOR);
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goto err_class;
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}
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err = scsi_register_driver(&st_template.gendrv);
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if (err)
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goto err_chrdev;
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err = do_create_driverfs_files();
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if (err)
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goto err_scsidrv;
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return 0;
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err_scsidrv:
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scsi_unregister_driver(&st_template.gendrv);
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err_chrdev:
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unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0),
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ST_MAX_TAPE_ENTRIES);
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err_class:
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class_destroy(st_sysfs_class);
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printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", SCSI_TAPE_MAJOR);
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return 1;
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return err;
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}
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static void __exit exit_st(void)
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@ -4225,14 +4240,33 @@ static ssize_t st_version_show(struct device_driver *ddd, char *buf)
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}
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static DRIVER_ATTR(version, S_IRUGO, st_version_show, NULL);
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static void do_create_driverfs_files(void)
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static int do_create_driverfs_files(void)
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{
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struct device_driver *driverfs = &st_template.gendrv;
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int err;
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driver_create_file(driverfs, &driver_attr_try_direct_io);
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driver_create_file(driverfs, &driver_attr_fixed_buffer_size);
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driver_create_file(driverfs, &driver_attr_max_sg_segs);
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driver_create_file(driverfs, &driver_attr_version);
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err = driver_create_file(driverfs, &driver_attr_try_direct_io);
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if (err)
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return err;
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err = driver_create_file(driverfs, &driver_attr_fixed_buffer_size);
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if (err)
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goto err_try_direct_io;
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err = driver_create_file(driverfs, &driver_attr_max_sg_segs);
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if (err)
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goto err_attr_fixed_buf;
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err = driver_create_file(driverfs, &driver_attr_version);
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if (err)
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goto err_attr_max_sg;
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return 0;
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err_attr_max_sg:
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driver_remove_file(driverfs, &driver_attr_max_sg_segs);
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err_attr_fixed_buf:
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driver_remove_file(driverfs, &driver_attr_fixed_buffer_size);
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err_try_direct_io:
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driver_remove_file(driverfs, &driver_attr_try_direct_io);
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return err;
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}
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static void do_remove_driverfs_files(void)
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@ -4293,15 +4327,12 @@ static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf)
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CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
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static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
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static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
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{
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int i, rew, error;
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char name[10];
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struct class_device *st_class_member;
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if (!st_sysfs_class)
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return;
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for (rew=0; rew < 2; rew++) {
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/* Make sure that the minor numbers corresponding to the four
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first modes always get the same names */
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@ -4316,18 +4347,24 @@ static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
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if (IS_ERR(st_class_member)) {
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printk(KERN_WARNING "st%d: class_device_create failed\n",
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dev_num);
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error = PTR_ERR(st_class_member);
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goto out;
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}
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class_set_devdata(st_class_member, &STp->modes[mode]);
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class_device_create_file(st_class_member,
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&class_device_attr_defined);
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class_device_create_file(st_class_member,
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&class_device_attr_default_blksize);
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class_device_create_file(st_class_member,
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&class_device_attr_default_density);
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class_device_create_file(st_class_member,
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&class_device_attr_default_compression);
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error = class_device_create_file(st_class_member,
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&class_device_attr_defined);
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if (error) goto out;
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error = class_device_create_file(st_class_member,
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&class_device_attr_default_blksize);
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if (error) goto out;
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error = class_device_create_file(st_class_member,
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&class_device_attr_default_density);
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if (error) goto out;
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error = class_device_create_file(st_class_member,
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&class_device_attr_default_compression);
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if (error) goto out;
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if (mode == 0 && rew == 0) {
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error = sysfs_create_link(&STp->device->sdev_gendev.kobj,
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&st_class_member->kobj,
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@ -4336,11 +4373,15 @@ static void do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
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printk(KERN_ERR
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"st%d: Can't create sysfs link from SCSI device.\n",
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dev_num);
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goto out;
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}
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}
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}
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out:
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return;
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return 0;
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out:
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return error;
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}
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/* The following functions may be useful for a larger audience. */
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