git: 6e23ef9c5784 - stable/12 - debug_put_get: don't crash on null pointers

The branch stable/12 has been updated by vmaffione:

URL: https://cgit.FreeBSD.org/src/commit/?id=6e23ef9c5784af2d924b035b40805685db47163b

commit 6e23ef9c5784af2d924b035b40805685db47163b
Author:     Vincenzo Maffione <vmaffione@FreeBSD.org>
AuthorDate: 2022-12-24 15:31:36 +0000
Commit:     Vincenzo Maffione <vmaffione@FreeBSD.org>
CommitDate: 2022-12-31 12:14:25 +0000

    debug_put_get: don't crash on null pointers
    
    MFC after:      7 days
    
    (cherry picked from commit 92e8b4a6301cc4ff4481e981c95c5b30b2a44506)
---
 sys/dev/netmap/netmap_kern.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sys/dev/netmap/netmap_kern.h b/sys/dev/netmap/netmap_kern.h
index b6f0f70c8ac8..ea124a332af8 100644
--- a/sys/dev/netmap/netmap_kern.h
+++ b/sys/dev/netmap/netmap_kern.h
@@ -1573,8 +1573,8 @@ void __netmap_adapter_get(struct netmap_adapter *na);
 #define netmap_adapter_get(na) 				\
 	do {						\
 		struct netmap_adapter *__na = na;	\
-		nm_prinf("getting %p:%s (%d)", __na, (__na)->name, (__na)->na_refcount);	\
 		__netmap_adapter_get(__na);		\
+		nm_prinf("getting %p:%s -> %d", __na, (__na)->name, (__na)->na_refcount);	\
 	} while (0)
 
 int __netmap_adapter_put(struct netmap_adapter *na);
@@ -1582,8 +1582,11 @@ int __netmap_adapter_put(struct netmap_adapter *na);
 #define netmap_adapter_put(na)				\
 	({						\
 		struct netmap_adapter *__na = na;	\
-		nm_prinf("putting %p:%s (%d)", __na, (__na)->name, (__na)->na_refcount);	\
-		__netmap_adapter_put(__na);		\
+		if (__na == NULL)			\
+			nm_prinf("putting NULL");	\
+		else					\
+			nm_prinf("putting %p:%s -> %d", __na, (__na)->name, (__na)->na_refcount - 1);	\
+		__netmap_adapter_put(__na);	\
 	})
 
 #else /* !NM_DEBUG_PUTGET */