[PATCH net 2/9] idpf: improve locking around idpf_vc_xn_push_free()

[Tony Nguyen <anthony.l.nguyen@intel.com>]

From: Emil Tantilov <emil.s.tantilov@intel.com>

Protect the set_bit() operation for the free_xn bitmask in
idpf_vc_xn_push_free(), to make the locking consistent with rest of the
code and avoid potential races in that logic.

Fixes: 34c21fa894a1 ("idpf: implement virtchnl transaction manager")
Cc: stable@vger.kernel.org
Reported-by: Ray Zhang <sgzhang@google.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/idpf/idpf_virtchnl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
index 582e0c8e9dc0..fbd5a15b015c 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
@@ -402,7 +402,9 @@ static void idpf_vc_xn_push_free(struct idpf_vc_xn_manager *vcxn_mngr,
 				 struct idpf_vc_xn *xn)
 {
 	idpf_vc_xn_release_bufs(xn);
+	spin_lock_bh(&vcxn_mngr->xn_bm_lock);
 	set_bit(xn->idx, vcxn_mngr->free_xn_bm);
+	spin_unlock_bh(&vcxn_mngr->xn_bm_lock);
 }
 
 /**
-- 
2.47.1