device_get_path(): handle case when dev is root

PR:	266862
Based on submission by:	takawata
Reviewed by:	jhb, takawata
Disscussed with:	imp
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D36899

This commit is contained in:

Konstantin Belousov

2022-10-06 22:46:30 +03:00

parent d9c5a9ea49

commit 8cf783bde3

1 changed files with 7 additions and 1 deletions

									
										sys/kern/subr_bus.c
									
		+7
		-1
	
												View File
												
				@@ -5309,11 +5309,17 @@ device_get_path(device_t dev, const char *locator, char **rvp)

				{

					struct sbuf *sb;

					char *s;

					device_t parent;

					ssize_t len;

					int error;

					parent = device_get_parent(dev);

					if (parent == NULL) {

						*rvp = strdup_flags("/", M_BUS, M_NOWAIT);

						return (*rvp == NULL ? ENOMEM : 0);

					}

					sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND | SBUF_INCLUDENUL);

					error = BUS_GET_DEVICE_PATH(device_get_parent(dev), dev, locator, sb);

					error = BUS_GET_DEVICE_PATH(parent, dev, locator, sb);

					sbuf_finish(sb);	/* Note: errors checked with sbuf_len() below */

					if (error == 0) {

						len = sbuf_len(sb);