git: e44e611e31c3 - stable/13 - nfs: do not panic on bootpc_init when no interfaces are found

The branch stable/13 has been updated by alfredo:

URL: https://cgit.FreeBSD.org/src/commit/?id=e44e611e31c3ac3c36ee33af37e7159b5dd2be13

commit e44e611e31c3ac3c36ee33af37e7159b5dd2be13
Author:     Alfredo Dal'Ava Junior <alfredo@FreeBSD.org>
AuthorDate: 2022-04-07 22:33:26 +0000
Commit:     Alfredo Dal'Ava Junior <alfredo@FreeBSD.org>
CommitDate: 2022-05-06 12:14:28 +0000

    nfs: do not panic on bootpc_init when no interfaces are found
    
    Replaces panic with a warning message to allow kernel continue
    when no bootp eligible network interfaces are found.
    
    This avoids having to build a custom kernel when using a local root
    file system on targets like powerpcspe that expects bootp/NFS by
    default.
    
    Reviewed by:    rmacklem
    MFC after:      2 weeks
    Sponsored by:   Instituto de Pesquisas Eldorado (eldorado.org.br)
    Differential Revision:  https://reviews.freebsd.org/D34567
    
    (cherry picked from commit 0b1b30d66450b20bf18fb4ab39bc6d4f5a6a28fe)
---
 sys/nfs/bootp_subr.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/sys/nfs/bootp_subr.c b/sys/nfs/bootp_subr.c
index a012bc914aa5..a05f33a55a71 100644
--- a/sys/nfs/bootp_subr.c
+++ b/sys/nfs/bootp_subr.c
@@ -1504,7 +1504,7 @@ bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
 void
 bootpc_init(void)
 {
-	struct bootpc_ifcontext *ifctx;		/* Interface BOOTP contexts */
+	struct bootpc_ifcontext *ifctx = NULL;	/* Interface BOOTP contexts */
 	struct bootpc_globalcontext *gctx; 	/* Global BOOTP context */
 	struct ifnet *ifp;
 	struct sockaddr_dl *sdl;
@@ -1574,9 +1574,13 @@ bootpc_init(void)
 		}
 		ifcnt++;
 	}
+
 	IFNET_RUNLOCK();
-	if (ifcnt == 0)
-		panic("%s: no eligible interfaces", __func__);
+	if (ifcnt == 0) {
+		printf("WARNING: BOOTP found no eligible network interfaces, skipping!\n");
+		goto out;
+	}
+
 	for (; ifcnt > 0; ifcnt--)
 		allocifctx(gctx);
 #endif