On Wed, Sep 26, 2018 at 8:26 AM <laurentiu.tudor@xxxxxxx> wrote:
>
> From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
>
> Defer probe of qman portals after qman probing. This fixes the crash
> below, seen on NXP LS1043A SoCs:
>
> Unable to handle kernel NULL pointer dereference at virtual address
> 0000000000000004
> Mem abort info:
> ESR = 0x96000004
> Exception class = DABT (current EL), IL = 32 bits
> SET = 0, FnV = 0
> EA = 0, S1PTW = 0
> Data abort info:
> ISV = 0, ISS = 0x00000004
> CM = 0, WnR = 0
> [0000000000000004] user address but active_mm is swapper
> Internal error: Oops: 96000004 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 4.18.0-rc1-next-20180622-00200-g986f5c179185 #9
> Hardware name: LS1043A RDB Board (DT)
> pstate: 80000005 (Nzcv daif -PAN -UAO)
> pc : qman_set_sdest+0x74/0xa0
> lr : qman_portal_probe+0x22c/0x470
> sp : ffff00000803bbc0
> x29: ffff00000803bbc0 x28: 0000000000000000
> x27: ffff0000090c1b88 x26: ffff00000927cb68
> x25: ffff00000927c000 x24: ffff00000927cb60
> x23: 0000000000000000 x22: 0000000000000000
> x21: ffff0000090e9000 x20: ffff800073b5c810
> x19: ffff800027401298 x18: ffffffffffffffff
> x17: 0000000000000001 x16: 0000000000000000
> x15: ffff0000090e96c8 x14: ffff80002740138a
> x13: ffff0000090f2000 x12: 0000000000000030
> x11: ffff000008f25000 x10: 0000000000000000
> x9 : ffff80007bdfd2c0 x8 : 0000000000004000
> x7 : ffff80007393cc18 x6 : 0040000000000001
> x5 : 0000000000000000 x4 : ffffffffffffffff
> x3 : 0000000000000004 x2 : ffff00000927c900
> x1 : 0000000000000000 x0 : 0000000000000004
> Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
> Call trace:
> qman_set_sdest+0x74/0xa0
> platform_drv_probe+0x50/0xa8
> driver_probe_device+0x214/0x2f8
> __driver_attach+0xd8/0xe0
> bus_for_each_dev+0x68/0xc8
> driver_attach+0x20/0x28
> bus_add_driver+0x108/0x228
> driver_register+0x60/0x110
> __platform_driver_register+0x40/0x48
> qman_portal_driver_init+0x20/0x84
> do_one_initcall+0x58/0x168
> kernel_init_freeable+0x184/0x22c
> kernel_init+0x10/0x108
> ret_from_fork+0x10/0x18
> Code: f9400443 11001000 927e4800 8b000063 (b9400063)
> ---[ end trace 4f6d50489ecfb930 ]---
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
As this is part of a bug fix for v4.19, applied on soc/fsl for fix.
> ---
> drivers/soc/fsl/qbman/qman_portal.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/soc/fsl/qbman/qman_portal.c b/drivers/soc/fsl/qbman/qman_portal.c
> index 6d9da3b1b5ad..eef93cab84f1 100644
> --- a/drivers/soc/fsl/qbman/qman_portal.c
> +++ b/drivers/soc/fsl/qbman/qman_portal.c
> @@ -229,6 +229,14 @@ static int qman_portal_probe(struct platform_device *pdev)
> int irq, cpu, err;
> u32 val;
>
> + err = qman_is_probed();
> + if (!err)
> + return -EPROBE_DEFER;
> + if (err < 0) {
> + dev_err(&pdev->dev, "failing probe due to qman probe error\n");
> + return -ENODEV;
> + }
> +
> pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
> if (!pcfg)
> return -ENOMEM;
> --
> 2.17.1
>
