Attempted to work around the driver crash by unloading and reloading iwlmvm.ko. This results in a "Error, can not clear persistence bit" message in the kernel message log upon restart. It appears that following the initial crash the 7260 hardware is no longer responding to the kernel driver. Is there some way short of reboot to reset the 7260 device so that the kernel driver can re-initialize?

Unload and reload sequence:

modprobe -r iwlmvm
modprobe iwlmvm

dmesg output:

[19553.559632] Intel(R) Wireless WiFi driver for Linux
[19553.559633] Copyright(c) 2003- 2015 Intel Corporation
[19553.560176] iwlwifi 0000:03:00.0: firmware: direct-loading firmware iwlwifi-7260-17.ucode
[19553.560300] iwlwifi 0000:03:00.0: loaded firmware version 17.3216344376.0 op_mode iwlmvm
[19553.569183] iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0xFFFFFFFF
[19553.569196] iwlwifi 0000:03:00.0: Error, can not clear persistence bit
[19553.587422] ------------[ cut here ]------------
[19553.587423] Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
[19553.587436] WARNING: CPU: 5 PID: 2212 at drivers/net/wireless/intel/iwlwifi/pcie/trans.c:2033 iwl_trans_pcie_grab_nic_access+0x1e8/0x220 [iwlwifi]
[19553.587437] Modules linked in: iwlmvm(+) iwlwifi mac80211 cfg80211 cpufreq_powersave cpufreq_conservative cpufreq_userspace snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic intel_rapl ccm algif_aead cbc des_generic arc4 algif_skcipher cmac sha512_ssse3 sha512_generic x86_pkg_temp_thermal intel_powerclamp md4 algif_hash coretemp af_alg kvm_intel kvm snd_hda_intel snd_hda_codec btusb irqbypass btrtl crct10dif_pclmul btbcm i915 crc32_pclmul snd_hda_core btintel ghash_clmulni_intel snd_hwdep intel_cstate bluetooth drm_kms_helper snd_pcm intel_uncore drbg snd_timer mei_wdt ansi_cprng snd evdev ppdev drm pcc_cpufreq intel_rapl_perf soundcore pcspkr ecdh_generic sg mei_me iTCO_wdt mei iTCO_vendor_support rfkill i2c_algo_bit parport_pc parport button video nfsd auth_rpcgss nfs_acl lockd grace
[19553.587451]  sunrpc ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb sd_mod crc32c_intel ahci libahci libata nvme xhci_pci aesni_intel xhci_hcd ehci_pci e1000e ehci_hcd scsi_mod aes_x86_64 crypto_simd usbcore cryptd i2c_i801 glue_helper nvme_core lpc_ich mfd_core usb_common thermal fan [last unloaded: cfg80211]
[19553.587459] CPU: 5 PID: 2212 Comm: modprobe Tainted: G        W         4.19.0-10-amd64 #1 Debian 4.19.132-1
[19553.587459] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./IMB-170, BIOS P1.90 04/30/2018
[19553.587463] RIP: 0010:iwl_trans_pcie_grab_nic_access+0x1e8/0x220 [iwlwifi]
[19553.587464] Code: 09 dd 49 8d 56 08 bf 00 02 00 00 e8 a2 de ff db e9 33 ff ff ff 89 c6 48 c7 c7 80 75 eb c0 c6 05 69 46 02 00 01 e8 c2 0a fe db <0f> 0b e9 ee fe ff ff 48 8b 7b 30 48 c7 c1 e8 75 eb c0 31 d2 31 f6
[19553.587465] RSP: 0018:ffff9b5840d57b40 EFLAGS: 00010086
[19553.587466] RAX: 0000000000000000 RBX: ffff8de5b4840018 RCX: 0000000000000006
[19553.587466] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff8de5d65566b0
[19553.587467] RBP: 0000000000000000 R08: 00000000000004cc R09: 0000000000000004
[19553.587467] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8de5b484a258
[19553.587468] R13: ffff9b5840d57b70 R14: 00000000ffffffff R15: 0000000fffffffe0
[19553.587468] FS:  00007ff1f6988480(0000) GS:ffff8de5d6540000(0000) knlGS:0000000000000000
[19553.587469] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[19553.587469] CR2: 00007ffc6a472888 CR3: 00000002125a8002 CR4: 00000000001606e0
[19553.587470] Call Trace:
[19553.587475]  iwl_read_prph+0x32/0x90 [iwlwifi]
[19553.587479]  iwl_pcie_apm_init+0x15a/0x210 [iwlwifi]
[19553.587482]  iwl_pcie_apm_stop+0x324/0x360 [iwlwifi]
[19553.587485]  iwl_trans_pcie_op_mode_leave+0x86/0x150 [iwlwifi]
[19553.587491]  iwl_op_mode_mvm_start+0x8f0/0x990 [iwlmvm]
[19553.587494]  iwl_opmode_register+0x7c/0xf0 [iwlwifi]
[19553.587496]  ? 0xffffffffc0ac9000
[19553.587501]  iwl_mvm_init+0x34/0x1000 [iwlmvm]
[19553.587503]  do_one_initcall+0x46/0x1c3
[19553.587505]  ? free_unref_page_commit+0x91/0x100
[19553.587507]  ? _cond_resched+0x15/0x30
[19553.587509]  ? kmem_cache_alloc_trace+0x15e/0x1e0
[19553.587512]  do_init_module+0x5a/0x210
[19553.587513]  load_module+0x2167/0x23d0
[19553.587515]  ? __do_sys_finit_module+0xad/0x110
[19553.587516]  __do_sys_finit_module+0xad/0x110
[19553.587518]  do_syscall_64+0x53/0x110
[19553.587519]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[19553.587520] RIP: 0033:0x7ff1f6aa2f59
[19553.587521] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
[19553.587522] RSP: 002b:00007ffc6a475978 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[19553.587523] RAX: ffffffffffffffda RBX: 0000556256d32e10 RCX: 00007ff1f6aa2f59
[19553.587523] RDX: 0000000000000000 RSI: 00005562558893f0 RDI: 0000000000000006
[19553.587523] RBP: 00005562558893f0 R08: 0000000000000000 R09: 0000000000000000
[19553.587524] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000
[19553.587524] R13: 0000556256d32f40 R14: 0000000000040000 R15: 0000556256d32e10
[19553.587525] ---[ end trace bdb25fc91c9d5a21 ]---
[19553.587527] iwlwifi 0000:03:00.0: iwlwifi transaction failed, dumping registers
[19553.587529] iwlwifi 0000:03:00.0: iwlwifi device config registers:
[19553.587572] iwlwifi 0000:03:00.0: 00000000: 08b18086 00100406 028000bb 00000000 00000004 00000000 00000000 00000000
[19553.587575] iwlwifi 0000:03:00.0: 00000020: 00000000 00000000 00000000 40708086 00000000 000000c8 00000000 00000100
[19553.587577] iwlwifi 0000:03:00.0: iwlwifi device memory mapped registers:
[19553.587613] iwlwifi 0000:03:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[19553.587615] iwlwifi 0000:03:00.0: 00000020: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[19553.587620] iwlwifi 0000:03:00.0: iwlwifi device AER capability structure:
[19553.587648] iwlwifi 0000:03:00.0: 00000000: 14010001 00100000 00000000 00462031 000031c1 00002000 00000014 40000001
[19553.587650] iwlwifi 0000:03:00.0: 00000020: 0000000f f7a00460 00000000
[19553.587652] iwlwifi 0000:03:00.0: iwlwifi parent port (0000:00:1c.2) config registers:
[19553.587669] iwlwifi 0000:00:1c.2: 00000000: 1e148086 00100007 060400c4 00810010 00000000 00000000 00030300 200000f0
[19553.587671] iwlwifi 0000:00:1c.2: 00000020: f7a0f7a0 0001fff1 00000000 00000000 00000000 00000040 00000000 0010030b