scsi: ipr: Use kobj_to_dev()

Use kobj_to_dev() instead of open-coding it.

Link: https://lore.kernel.org/r/20220510105113.1351891-1-chi.minghao@zte.com.cnReported-by: NZeal Robot <zealci@zte.com.cn>
Acked-by: NBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: NMinghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ipr.c

@@ -3456,7 +3456,7 @@ static ssize_t ipr_read_trace(struct file *filp, struct kobject *kobj,
 			      struct bin_attribute *bin_attr,
 			      char *buf, loff_t off, size_t count)
 {
-	struct device *dev = container_of(kobj, struct device, kobj);
+	struct device *dev = kobj_to_dev(kobj);
 	struct Scsi_Host *shost = class_to_shost(dev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	unsigned long lock_flags = 0;
@@ -4182,7 +4182,7 @@ static ssize_t ipr_read_async_err_log(struct file *filep, struct kobject *kobj,
 				struct bin_attribute *bin_attr, char *buf,
 				loff_t off, size_t count)
 {
-	struct device *cdev = container_of(kobj, struct device, kobj);
+	struct device *cdev = kobj_to_dev(kobj);
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	struct ipr_hostrcb *hostrcb;
@@ -4206,7 +4206,7 @@ static ssize_t ipr_next_async_err_log(struct file *filep, struct kobject *kobj,
 				struct bin_attribute *bin_attr, char *buf,
 				loff_t off, size_t count)
 {
-	struct device *cdev = container_of(kobj, struct device, kobj);
+	struct device *cdev = kobj_to_dev(kobj);
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	struct ipr_hostrcb *hostrcb;
@@ -4267,7 +4267,7 @@ static ssize_t ipr_read_dump(struct file *filp, struct kobject *kobj,
 			     struct bin_attribute *bin_attr,
 			     char *buf, loff_t off, size_t count)
 {
-	struct device *cdev = container_of(kobj, struct device, kobj);
+	struct device *cdev = kobj_to_dev(kobj);
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	struct ipr_dump *dump;
@@ -4456,7 +4456,7 @@ static ssize_t ipr_write_dump(struct file *filp, struct kobject *kobj,
 			      struct bin_attribute *bin_attr,
 			      char *buf, loff_t off, size_t count)
 {
-	struct device *cdev = container_of(kobj, struct device, kobj);
+	struct device *cdev = kobj_to_dev(kobj);
 	struct Scsi_Host *shost = class_to_shost(cdev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	int rc;