diff options
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 7943b762c12d..3aee9464a7bf 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -382,7 +382,7 @@ static ssize_t show_host_busy(struct device *dev, struct device_attribute *attr, char *buf) { struct Scsi_Host *shost = class_to_shost(dev); - return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy)); + return snprintf(buf, 20, "%d\n", scsi_host_busy(shost)); } static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL); @@ -722,8 +722,24 @@ static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - if (device_remove_file_self(dev, attr)) - scsi_remove_device(to_scsi_device(dev)); + struct kernfs_node *kn; + + kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); + WARN_ON_ONCE(!kn); + /* + * Concurrent writes into the "delete" sysfs attribute may trigger + * concurrent calls to device_remove_file() and scsi_remove_device(). + * device_remove_file() handles concurrent removal calls by + * serializing these and by ignoring the second and later removal + * attempts. Concurrent calls of scsi_remove_device() are + * serialized. The second and later calls of scsi_remove_device() are + * ignored because the first call of that function changes the device + * state into SDEV_DEL. + */ + device_remove_file(dev, attr); + scsi_remove_device(to_scsi_device(dev)); + if (kn) + sysfs_unbreak_active_protection(kn); return count; }; static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); |