If an osd has no requests and no linger requests, __reset_osd()
will just remove it with a call to __remove_osd(). That drops
a reference to the osd, and therefore the osd may have been free
by the time __reset_osd() returns. That function offers no
indication this may have occurred, and as a result the osd will
continue to be used even when it's no longer valid.
Change__reset_osd() so it returns an error (ENODEV) when it
deletes the osd being reset. And change __kick_osd_requests() so it
returns immediately (before referencing osd again) if __reset_osd()
returns *any* error.
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
---
net/ceph/osd_client.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index d1177ec..79a071b 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -507,7 +507,7 @@ static void __kick_osd_requests(struct
ceph_osd_client *osdc,
dout("__kick_osd_requests osd%d\n", osd->o_osd);
err = __reset_osd(osdc, osd);
- if (err == -EAGAIN)
+ if (err)
return;
list_for_each_entry(req, &osd->o_requests, r_osd_item) {
@@ -671,6 +671,7 @@ static int __reset_osd(struct ceph_osd_client *osdc,
struct ceph_osd *osd)
if (list_empty(&osd->o_requests) &&
list_empty(&osd->o_linger_requests)) {
__remove_osd(osdc, osd);
+ ret = -ENODEV;
} else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
&osd->o_con.peer_addr,
sizeof(osd->o_con.peer_addr)) == 0 &&
--
1.7.9.5
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