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authorDavid Howells <dhowells@redhat.com>2018-04-09 23:12:31 +0300
committerDavid Howells <dhowells@redhat.com>2018-04-09 23:12:31 +0300
commitfe342cf77bc3c3ba89e8bb1e4eddbe614df4efa4 (patch)
treed47c6b4998b585a3c845d70617669119a4456877 /fs/afs/server.c
parenta09acf4b43b90581bf53b0c03cc84ed693bf27e2 (diff)
downloadlinux-fe342cf77bc3c3ba89e8bb1e4eddbe614df4efa4.tar.xz
afs: Fix checker warnings
Fix warnings raised by checker, including: (*) Warnings raised by unequal comparison for the purposes of sorting, where the endianness doesn't matter: fs/afs/addr_list.c:246:21: warning: restricted __be16 degrades to integer fs/afs/addr_list.c:246:30: warning: restricted __be16 degrades to integer fs/afs/addr_list.c:248:21: warning: restricted __be32 degrades to integer fs/afs/addr_list.c:248:49: warning: restricted __be32 degrades to integer fs/afs/addr_list.c:283:21: warning: restricted __be16 degrades to integer fs/afs/addr_list.c:283:30: warning: restricted __be16 degrades to integer (*) afs_set_cb_interest() is not actually used and can be removed. (*) afs_cell_gc_delay() should be provided with a sysctl. (*) afs_cell_destroy() needs to use rcu_access_pointer() to read cell->vl_addrs. (*) afs_init_fs_cursor() should be static. (*) struct afs_vnode::permit_cache needs to be marked __rcu. (*) afs_server_rcu() needs to use rcu_access_pointer(). (*) afs_destroy_server() should use rcu_access_pointer() on server->addresses as the server object is no longer accessible. (*) afs_find_server() casts __be16/__be32 values to int in order to directly compare them for the purpose of finding a match in a list, but is should also annotate the cast with __force to avoid checker warnings. (*) afs_check_permit() accesses vnode->permit_cache outside of the RCU readlock, though it doesn't then access the value; the extraneous access is deleted. False positives: (*) Conditional locking around the code in xdr_decode_AFSFetchStatus. This can be dealt with in a separate patch. fs/afs/fsclient.c:148:9: warning: context imbalance in 'xdr_decode_AFSFetchStatus' - different lock contexts for basic block (*) Incorrect handling of seq-retry lock context balance: fs/afs/inode.c:455:38: warning: context imbalance in 'afs_getattr' - different lock contexts for basic block fs/afs/server.c:52:17: warning: context imbalance in 'afs_find_server' - different lock contexts for basic block fs/afs/server.c:128:17: warning: context imbalance in 'afs_find_server_by_uuid' - different lock contexts for basic block Errors: (*) afs_lookup_cell_rcu() needs to break out of the seq-retry loop, not go round again if it successfully found the workstation cell. (*) Fix UUID decode in afs_deliver_cb_probe_uuid(). (*) afs_cache_permit() has a missing rcu_read_unlock() before one of the jumps to the someone_else_changed_it label. Move the unlock to after the label. (*) afs_vl_get_addrs_u() is using ntohl() rather than htonl() when encoding to XDR. (*) afs_deliver_yfsvl_get_endpoints() is using htonl() rather than ntohl() when decoding from XDR. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/server.c')
-rw-r--r--fs/afs/server.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/afs/server.c b/fs/afs/server.c
index a43ef77dabae..e23be63998a8 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -59,7 +59,8 @@ struct afs_server *afs_find_server(struct afs_net *net,
alist = rcu_dereference(server->addresses);
for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
b = &alist->addrs[i].transport.sin6;
- diff = (u16)a->sin6_port - (u16)b->sin6_port;
+ diff = ((u16 __force)a->sin6_port -
+ (u16 __force)b->sin6_port);
if (diff == 0)
diff = memcmp(&a->sin6_addr,
&b->sin6_addr,
@@ -79,10 +80,11 @@ struct afs_server *afs_find_server(struct afs_net *net,
alist = rcu_dereference(server->addresses);
for (i = 0; i < alist->nr_ipv4; i++) {
b = &alist->addrs[i].transport.sin6;
- diff = (u16)a->sin6_port - (u16)b->sin6_port;
+ diff = ((u16 __force)a->sin6_port -
+ (u16 __force)b->sin6_port);
if (diff == 0)
- diff = ((u32)a->sin6_addr.s6_addr32[3] -
- (u32)b->sin6_addr.s6_addr32[3]);
+ diff = ((u32 __force)a->sin6_addr.s6_addr32[3] -
+ (u32 __force)b->sin6_addr.s6_addr32[3]);
if (diff == 0)
goto found;
if (diff < 0) {
@@ -381,7 +383,7 @@ static void afs_server_rcu(struct rcu_head *rcu)
{
struct afs_server *server = container_of(rcu, struct afs_server, rcu);
- afs_put_addrlist(server->addresses);
+ afs_put_addrlist(rcu_access_pointer(server->addresses));
kfree(server);
}
@@ -390,7 +392,7 @@ static void afs_server_rcu(struct rcu_head *rcu)
*/
static void afs_destroy_server(struct afs_net *net, struct afs_server *server)
{
- struct afs_addr_list *alist = server->addresses;
+ struct afs_addr_list *alist = rcu_access_pointer(server->addresses);
struct afs_addr_cursor ac = {
.alist = alist,
.addr = &alist->addrs[0],