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device_get_path(): handle case when dev is root

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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
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8
sys/kern/subr_bus.c
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@ -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);