--- zzzz-none-000/linux-4.4.271/drivers/scsi/sg.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/scsi/sg.c	2023-04-19 10:22:29.000000000 +0000
@@ -545,7 +545,7 @@
 		old_hdr->result = EIO;
 		break;
 	case DID_ERROR:
-		old_hdr->result = (srp->sense_b[0] == 0 && 
+		old_hdr->result = (srp->sense_b[0] == 0 &&
 				  hp->masked_status == GOOD) ? 0 : EIO;
 		break;
 	default:
@@ -942,8 +942,10 @@
 			return -ENXIO;
 		if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
 			return -EFAULT;
+		mutex_lock(&sfp->parentdp->open_rel_lock);
 		result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
 				 1, read_only, 1, &srp);
+		mutex_unlock(&sfp->parentdp->open_rel_lock);
 		if (result < 0)
 			return result;
 		result = wait_event_interruptible(sfp->read_wait,
@@ -1043,8 +1045,8 @@
 		result = get_user(val, ip);
 		if (result)
 			return result;
-                if (val < 0)
-                        return -EINVAL;
+		if (val < 0)
+			return -EINVAL;
 		val = min_t(int, val,
 			    max_sectors_bytes(sdp->device->request_queue));
 		mutex_lock(&sfp->f_mutex);
@@ -1055,8 +1057,10 @@
 				return -EBUSY;
 			}
 
+			mutex_lock(&sfp->parentdp->open_rel_lock);
 			sg_remove_scat(sfp, &sfp->reserve);
 			sg_build_reserve(sfp, val);
+			mutex_unlock(&sfp->parentdp->open_rel_lock);
 		}
 		mutex_unlock(&sfp->f_mutex);
 		return 0;
@@ -1183,14 +1187,14 @@
 		return -ENXIO;
 
 	sdev = sdp->device;
-	if (sdev->host->hostt->compat_ioctl) { 
+	if (sdev->host->hostt->compat_ioctl) {
 		int ret;
 
 		ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
 
 		return ret;
 	}
-	
+
 	return -ENOIOCTLCMD;
 }
 #endif
@@ -1684,7 +1688,7 @@
 	else
 		def_reserved_size = sg_big_buff;
 
-	rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 
+	rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
 				    SG_MAX_DEVS, "sg");
 	if (rc)
 		return rc;
@@ -2346,7 +2350,7 @@
 };
 
 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
-static ssize_t sg_proc_write_dressz(struct file *filp, 
+static ssize_t sg_proc_write_dressz(struct file *filp,
 		const char __user *buffer, size_t count, loff_t *off);
 static const struct file_operations dressz_fops = {
 	.owner = THIS_MODULE,
@@ -2486,7 +2490,7 @@
 	return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
 }
 
-static ssize_t 
+static ssize_t
 sg_proc_write_adio(struct file *filp, const char __user *buffer,
 		   size_t count, loff_t *off)
 {
@@ -2507,7 +2511,7 @@
 	return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
 }
 
-static ssize_t 
+static ssize_t
 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
 		     size_t count, loff_t *off)
 {