RDMA/irdma: Avoid free the non-cqp_request scratch

When creating ceq_0 during probing irdma, cqp.sc_cqp will be sent as a
cqp_request to cqp->sc_cqp.sq_ring. If the request is pending when
removing the irdma driver or unplugging its aux device, cqp.sc_cqp will be
dereferenced as wrong struct in irdma_free_pending_cqp_request().

  PID: 3669   TASK: ffff88aef892c000  CPU: 28  COMMAND: "kworker/28:0"
   #0 [fffffe0000549e38] crash_nmi_callback at ffffffff810e3a34
   Freescale#1 [fffffe0000549e40] nmi_handle at ffffffff810788b2
   Freescale#2 [fffffe0000549ea0] default_do_nmi at ffffffff8107938f
   Freescale#3 [fffffe0000549eb8] do_nmi at ffffffff81079582
   Freescale#4 [fffffe0000549ef0] end_repeat_nmi at ffffffff82e016b4
      [exception RIP: native_queued_spin_lock_slowpath+1291]
      RIP: ffffffff8127e72b  RSP: ffff88aa841ef778  RFLAGS: 00000046
      RAX: 0000000000000000  RBX: ffff88b01f849700  RCX: ffffffff8127e47e
      RDX: 0000000000000000  RSI: 0000000000000004  RDI: ffffffff83857ec0
      RBP: ffff88afe3e4efc8   R8: ffffed15fc7c9dfa   R9: ffffed15fc7c9dfa
      R10: 0000000000000001  R11: ffffed15fc7c9df9  R12: 0000000000740000
      R13: ffff88b01f849708  R14: 0000000000000003  R15: ffffed1603f092e1
      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0000
  -- <NMI exception stack> --
   Freescale#5 [ffff88aa841ef778] native_queued_spin_lock_slowpath at ffffffff8127e72b
   Freescale#6 [ffff88aa841ef7b0] _raw_spin_lock_irqsave at ffffffff82c22aa4
   Freescale#7 [ffff88aa841ef7c8] __wake_up_common_lock at ffffffff81257363
   Freescale#8 [ffff88aa841ef888] irdma_free_pending_cqp_request at ffffffffa0ba12cc [irdma]
   Freescale#9 [ffff88aa841ef958] irdma_cleanup_pending_cqp_op at ffffffffa0ba1469 [irdma]
   Freescale#10 [ffff88aa841ef9c0] irdma_ctrl_deinit_hw at ffffffffa0b2989f [irdma]
   Freescale#11 [ffff88aa841efa28] irdma_remove at ffffffffa0b252df [irdma]
   Freescale#12 [ffff88aa841efae8] auxiliary_bus_remove at ffffffff8219afdb
   Freescale#13 [ffff88aa841efb00] device_release_driver_internal at ffffffff821882e6
   Freescale#14 [ffff88aa841efb38] bus_remove_device at ffffffff82184278
   Freescale#15 [ffff88aa841efb88] device_del at ffffffff82179d23
   Freescale#16 [ffff88aa841efc48] ice_unplug_aux_dev at ffffffffa0eb1c14 [ice]
   Freescale#17 [ffff88aa841efc68] ice_service_task at ffffffffa0d88201 [ice]
   Freescale#18 [ffff88aa841efde8] process_one_work at ffffffff811c589a
   Freescale#19 [ffff88aa841efe60] worker_thread at ffffffff811c71ff
   Freescale#20 [ffff88aa841eff10] kthread at ffffffff811d87a0
   Freescale#21 [ffff88aa841eff50] ret_from_fork at ffffffff82e0022f

Fixes: 44d9e52 ("RDMA/irdma: Implement device initialization definitions")
Link: https://lore.kernel.org/r/[email protected]
Suggested-by: "Ismail, Mustafa" <[email protected]>
Signed-off-by: Shifeng Li <[email protected]>
Reviewed-by: Shiraz Saleem <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

drivers/infiniband/hw/irdma/hw.c

@@ -1184,7 +1184,6 @@ static int irdma_create_ceq(struct irdma_pci_f *rf, struct irdma_ceq *iwceq,
 	int status;
 	struct irdma_ceq_init_info info = {};
 	struct irdma_sc_dev *dev = &rf->sc_dev;
-	u64 scratch;
 	u32 ceq_size;
 
 	info.ceq_id = ceq_id;
@@ -1205,14 +1204,13 @@ static int irdma_create_ceq(struct irdma_pci_f *rf, struct irdma_ceq *iwceq,
 	iwceq->sc_ceq.ceq_id = ceq_id;
 	info.dev = dev;
 	info.vsi = vsi;
-	scratch = (uintptr_t)&rf->cqp.sc_cqp;
 	status = irdma_sc_ceq_init(&iwceq->sc_ceq, &info);
 	if (!status) {
 		if (dev->ceq_valid)
 			status = irdma_cqp_ceq_cmd(&rf->sc_dev, &iwceq->sc_ceq,
 						   IRDMA_OP_CEQ_CREATE);
 		else
-			status = irdma_sc_cceq_create(&iwceq->sc_ceq, scratch);
+			status = irdma_sc_cceq_create(&iwceq->sc_ceq, 0);
 	}
 
 	if (status) {