RE: [PATCH v2] RDMA/irdma: Avoid free the non-cqp_request scratch

[Saleem, Shiraz]

> Subject: [PATCH v2] 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().
> 
> crash> bt 3669
> PID: 3669   TASK: ffff88aef892c000  CPU: 28  COMMAND: "kworker/28:0"
>  #0 [fffffe0000549e38] crash_nmi_callback at ffffffff810e3a34
>  #1 [fffffe0000549e40] nmi_handle at ffffffff810788b2
>  #2 [fffffe0000549ea0] default_do_nmi at ffffffff8107938f
>  #3 [fffffe0000549eb8] do_nmi at ffffffff81079582
>  #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> ---
>  #5 [ffff88aa841ef778] native_queued_spin_lock_slowpath at ffffffff8127e72b
>  #6 [ffff88aa841ef7b0] _raw_spin_lock_irqsave at ffffffff82c22aa4
>  #7 [ffff88aa841ef7c8] __wake_up_common_lock at ffffffff81257363
>  #8 [ffff88aa841ef888] irdma_free_pending_cqp_request at ffffffffa0ba12cc
> [irdma]
>  #9 [ffff88aa841ef958] irdma_cleanup_pending_cqp_op at ffffffffa0ba1469 [irdma]
>  #10 [ffff88aa841ef9c0] irdma_ctrl_deinit_hw at ffffffffa0b2989f [irdma]
>  #11 [ffff88aa841efa28] irdma_remove at ffffffffa0b252df [irdma]
>  #12 [ffff88aa841efae8] auxiliary_bus_remove at ffffffff8219afdb
>  #13 [ffff88aa841efb00] device_release_driver_internal at ffffffff821882e6
>  #14 [ffff88aa841efb38] bus_remove_device at ffffffff82184278
>  #15 [ffff88aa841efb88] device_del at ffffffff82179d23
>  #16 [ffff88aa841efc48] ice_unplug_aux_dev at ffffffffa0eb1c14 [ice]
>  #17 [ffff88aa841efc68] ice_service_task at ffffffffa0d88201 [ice]
>  #18 [ffff88aa841efde8] process_one_work at ffffffff811c589a
>  #19 [ffff88aa841efe60] worker_thread at ffffffff811c71ff
>  #20 [ffff88aa841eff10] kthread at ffffffff811d87a0
>  #21 [ffff88aa841eff50] ret_from_fork at ffffffff82e0022f
> 
> Fixes: 44d9e52977a1 ("RDMA/irdma: Implement device initialization definitions")
> Suggested-by: Leon Romanovsky <leon@xxxxxxxxxx>
> Signed-off-by: Shifeng Li <lishifeng@xxxxxxxxxxxxxx>
> ---
>  drivers/infiniband/hw/irdma/hw.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 

Other than the suggested-by tag being incorrect, looks good to me.

Reviewed-by: Shiraz Saleem <shiraz.saleem@xxxxxxxxx>