Basically the same fix to smb_locksmbhdr(), if already locked, don't sleep.

src/smblib/smblib.c

@@ -352,8 +352,10 @@ int SMBCALL smb_locksmbhdr(smb_t* smb)
 		/* In case we've already locked it */
 		if(unlock(fileno(smb->shd_fp),0L,sizeof(smbhdr_t)+sizeof(smbstatus_t))==0)
 			smb->locked=FALSE;
+		else {
 			SLEEP(smb->retry_delay);
 		}
+	}
 	safe_snprintf(smb->last_error,sizeof(smb->last_error),"timeout locking header");
 	return(SMB_ERR_TIMEOUT);
 }
@@ -475,9 +477,10 @@ int SMBCALL smb_lockmsghdr(smb_t* smb, smbmsg_t* msg)
 			if(time(NULL)-start>=(time_t)smb->retry_time) 
 				break;
 		/* In case we've already locked it */
-		if(unlock(fileno(smb->shd_fp),msg->idx.offset,sizeof(msghdr_t))!=0)
+		if(unlock(fileno(smb->shd_fp),msg->idx.offset,sizeof(msghdr_t))!=0) {
 			SLEEP(smb->retry_delay);
 		}
+	}
 	safe_snprintf(smb->last_error,sizeof(smb->last_error),"timeout locking header");
 	return(SMB_ERR_TIMEOUT);
 }