[PATCH 6.6.y] PCI: endpoint: pci-epf-vntb: Stop cmd_handler work in epf_ntb_epc_cleanup

[Sasha Levin <sashal@kernel.org>]

From: Koichiro Den <den@valinux.co.jp>

[ Upstream commit d799984233a50abd2667a7d17a9a710a3f10ebe2 ]

Disable the delayed work before clearing BAR mappings and doorbells to
avoid running the handler after resources have been torn down.

  Unable to handle kernel paging request at virtual address ffff800083f46004
  [...]
  Internal error: Oops: 0000000096000007 [#1]  SMP
  [...]
  Call trace:
   epf_ntb_cmd_handler+0x54/0x200 [pci_epf_vntb] (P)
   process_one_work+0x154/0x3b0
   worker_thread+0x2c8/0x400
   kthread+0x148/0x210
   ret_from_fork+0x10/0x20

Fixes: e35f56bb0330 ("PCI: endpoint: Support NTB transfer between RC and EP")
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260226084142.2226875-4-den@valinux.co.jp
[ replaced disable_delayed_work_sync() with cancel_delayed_work_sync() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 33c3f9b980e68..75a654e2ba66d 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -810,6 +810,7 @@ static int epf_ntb_epc_init(struct epf_ntb *ntb)
  */
 static void epf_ntb_epc_cleanup(struct epf_ntb *ntb)
 {
+	cancel_delayed_work_sync(&ntb->cmd_handler);
 	epf_ntb_mw_bar_clear(ntb, ntb->num_mws);
 	epf_ntb_db_bar_clear(ntb);
 	epf_ntb_config_sspad_bar_clear(ntb);
-- 
2.53.0