Driver error with Petalinux 2020.2

[drew-os]

I was able to follow the guide and build the project with Petalinux 2019.2 without error, then run the example on a ZCU111. I then ported it to Petalinux 2020.2, generated the SDK, and built the project again without build errors. Now I get errors from the driver on boot, and the example won't run. I'm not familiar with kernel modules, so any help with diagnosing what is going wrong is appreciated.

Here it seems like it can't find the "rx" DMA device, but is able to find "tx".
Boot errors:

[    7.639431] srs_dma_driver: loading out-of-tree module taints kernel.
[    7.639433] srs_dma_driver: loading out-of-tree module taints kernel.
[    7.646698] srs_dma_driver srs_rx_dma: Probing srs-dma driver...
[    7.658384] srs_dma_driver srs_rx_dma: Couldn't find DMA channel: rx
[    7.664733] srs_dma_driver srs_rx_dma: Successfully probed!
[    7.670356] srs_dma_driver srs_tx_dma: Probing srs-dma driver...
[    7.678287] srs_dma_driver srs_tx_dma: found dma channel: name="tx", direction="tx"
[    7.686223] srs_dma_driver srs_tx_dma: created character device /dev/srs_tx_dma
[    7.693655] srs_dma_driver srs_tx_dma: Successfully probed!

[   13.040924] ------------[ cut here ]------------
[   13.045553] refcount_t: increment on 0; use-after-free.
[   13.050849] WARNING: CPU: 3 PID: 716 at lib/refcount.c:156 refcount_inc_checked+0x40/0x48
[   13.059016] Modules linked in: srs_dma_driver(O)
[   13.063629] CPU: 3 PID: 716 Comm: python3 Tainted: G           O      5.4.0-xilinx-v2020.2 #1
[   13.072140] Hardware name: ZynqMP ZCU111 RevA (DT)
[   13.076916] pstate: 60000005 (nZCv daif -PAN -UAO)
[   13.081701] pc : refcount_inc_checked+0x40/0x48
[   13.086221] lr : refcount_inc_checked+0x40/0x48
[   13.090740] sp : ffff80001195ba80
[   13.094039] x29: ffff80001195ba80 x28: ffff800011269950
[   13.099342] x27: ffff80001023e838 x26: 0000000000000000
[   13.104638] x25: 00000000000000f2 x24: ffff80001195bb84
[   13.109941] x23: 000000000f200000 x22: ffff00087a842000
[   13.115245] x21: 0000000000000000 x20: 0000000000000000
[   13.120556] x19: ffff800011269950 x18: 0000000000000010
[   13.125860] x17: 0000000000000000 x16: 0000000000000000
[   13.131164] x15: ffff00087a310728 x14: ffffffffffffffff
[   13.136468] x13: ffff80009195b7c7 x12: ffff80001195b7d0
[   13.141770] x11: ffff800011186000 x10: 0000000000000000
[   13.147066] x9 : ffff80001122a000 x8 : 00000000000001cf
[   13.152376] x7 : 0000000000000006 x6 : ffff80001122a19a
[   13.157672] x5 : 0000000000000001 x4 : 0000000000000000
[   13.162967] x3 : 0000000000000000 x2 : 00000000ffffffff
[   13.168263] x1 : 2404589073113d00 x0 : 0000000000000000
[   13.173566] Call trace:
[   13.176003]  refcount_inc_checked+0x40/0x48
[   13.180176]  kobject_get+0x24/0x50
[   13.183569]  cdev_get+0x30/0x78
[   13.186700]  exact_lock+0x10/0x20
[   13.190010]  kobj_lookup+0xb0/0x140
[   13.193489]  chrdev_open+0x138/0x200
[   13.197057]  do_dentry_open+0x104/0x398
[   13.200889]  vfs_open+0x28/0x30
[   13.204018]  path_openat+0x4a0/0x1248
[   13.207671]  do_filp_open+0x74/0xf8
[   13.211144]  do_sys_open+0x168/0x218
[   13.214713]  __arm64_sys_openat+0x20/0x28
[   13.218717]  el0_svc_common.constprop.0+0x68/0x160
[   13.223498]  el0_svc_handler+0x6c/0x88
[   13.227237]  el0_svc+0x8/0xc
[   13.230110] ---[ end trace 7448125a3183e74e ]---

Device tree addition:

/include/ "system-conf.dtsi"
    / {
        srs_rx_dma {
            compatible = "srs,txrx_dma";
            dmas = <&radio_srs_timestamping_axi_dma_0 0x00>;
            dma-names = "rx";
            dma-direction = "rx";
            dma-coherent;
        };
     
        srs_tx_dma {
            compatible = "srs,txrx_dma";
            dmas = <&radio_srs_timestamping_axi_dma_1 0x00>;
            dma-names = "tx";
            dma-direction = "tx";
        };
    };

txrx_test example output:

root@zcu111:~/bin_app# nice -20 ./txrx_test -f 2400000000 -a n_prb=6 -p 6 -g 40 -o test_txrx_zcu.bin
Opening RF device...
Active RF plugins: libsrsran_rf_rfdc.so
Inactive RF plugins:
Supported RF device list: RFdc
Trying to open RF device 'RFdc'
CH0 n_prb=6
metal: info:      Registered shmem provider linux_shm.
metal: info:    [  369.369127] genirq: Flags mismatch irq 51. 00000004 (usp_rf_data_converter) vs. 00000004 (fabric)
  Registered shmem provider ion.reserved.
metal: info:      Reg[  369.383034] uio_pdrv_genirq a00c0000.usp_rf_data_converter: unable to register uio device
istered shmem provider ion.ion_system_contig_heap.
metal: info:[  369.396604] uio_pdrv_genirq: probe of a00c0000.usp_rf_data_converter failed with error -16
      Registered shmem provider ion.ion_system_heap.
metal: info:      metal_linux_dev_open: checking driver vfio-platform,a00c0000.usp_rf_data_converter,(null)
metal: error:     failed to open file , timeout.
[  369.479223] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000240
[  369.491973] Mem abort info:
[  369.494764]   ESR = 0x96000004
[  369.497817]   EC = 0x25: DABT (current EL), IL = 32 bits
[  369.503121]   SET = 0, FnV = 0
[  369.506165]   EA = 0, S1PTW = 0
[  369.509300] Data abort info:
[  369.512167]   ISV = 0, ISS = 0x00000004
[  369.515993]   CM = 0, WnR = 0
[  369.518954] user pgtable: 4k pages, 48-bit VAs, pgdp=000000087639b000
[  369.525391] [0000000000000240] pgd=0000000000000000
[  369.530266] Internal error: Oops: 96000004 [#1] SMP
[  369.535126] Modules linked in: srs_dma_driver(O)
[  369.539731] CPU: 3 PID: 895 Comm: txrx_test Tainted: G        W  O      5.4.0-xilinx-v2020.2 #1
[  369.548415] Hardware name: ZynqMP ZCU111 RevA (DT)
[  369.553191] pstate: 60000005 (nZCv daif -PAN -UAO)
[  369.557971] pc : uio_dmem_genirq_probe+0x194/0x390
[  369.562748] lr : uio_dmem_genirq_probe+0xf4/0x390
[  369.567433] sp : ffff80001138bb40
[  369.570732] x29: ffff80001138bb40 x28: ffff00087a025200
[  369.576026] x27: 0000000000000000 x26: 0000000000000007
[  369.581321] x25: ffff0008760fa480 x24: ffff0008784c7400
[  369.586616] x23: 0000000000000000 x22: ffff0008784c7530
[  369.591911] x21: ffff00087ab9dc10 x20: ffff00087ab9dc00
[  369.597206] x19: ffff0008784c7450 x18: 0000000000000001
[  369.602500] x17: 0000000000000000 x16: 0000000000000000
[  369.607795] x15: ffff00087a025628 x14: ffffffffffffffff
[  369.613090] x13: ffff0008760fa48a x12: 0000000000000030
[  369.618385] x11: 0000000000000038 x10: 0000000000000040
[  369.623680] x9 : 0000000000000000 x8 : ffff0008760fa500
[  369.628975] x7 : 0000000000000001 x6 : 0000000000000002
[  369.634270] x5 : 0000000000000404 x4 : ffff00087ab99800
[  369.639564] x3 : 0000000000000040 x2 : ffff00087ab99840
[  369.644859] x1 : 0000000000000002 x0 : 0000000000000001
[  369.650154] Call trace:
[  369.652588]  uio_dmem_genirq_probe+0x194/0x390
[  369.657024]  platform_drv_probe+0x50/0xa0
[  369.661023]  really_probe+0xd8/0x2f8
[  369.664582]  driver_probe_device+0x54/0xe8
[  369.668662]  __device_attach_driver+0x80/0xb8
[  369.673003]  bus_for_each_drv+0x74/0xc0
[  369.676830]  __device_attach+0xdc/0x138
[  369.680649]  device_attach+0x10/0x18
[  369.684208]  bus_rescan_devices_helper+0x48/0x88
[  369.688808]  drivers_probe_store+0x34/0x68
[  369.692890]  bus_attr_store+0x24/0x38
[  369.696544]  sysfs_kf_write+0x40/0x50
[  369.700188]  kernfs_fop_write+0xe4/0x1d8
[  369.704096]  __vfs_write+0x18/0x40
[  369.707487]  vfs_write+0xcc/0x1b8
[  369.710786]  ksys_write+0x68/0xf0
[  369.714084]  __arm64_sys_write+0x18/0x20
[  369.717993]  el0_svc_common.constprop.0+0x68/0x160
[  369.722774]  el0_svc_handler+0x6c/0x88
[  369.726506]  el0_svc+0x8/0xc
[  369.729374] Code: f2db6da0 f2edb6c0 1b007f40 b9002320 (b94242e0)
[  369.735456] ---[ end trace 9fc8dfc0e2335c0b ]---

Any ideas?