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66f6c20e45
The ifx_pcie_bus_enum_hack() function is called in ifx_pcie_read_config() while holding the ifx_pcie_lock spinlock. The ifx_pcie_bus_enum_hack() function calls pci_get_slot() which could sleep. Add a new function for pci_get_slot() which does not use a semaphore, the mutex should be sufficient. This fixes the sleep in atomic context which could cause a hang of the system. This fixes the following warning seen with CONFIG_KERNEL_DEBUG_ATOMIC_SLEEP=y. [ 12.264300] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff] [ 12.272226] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1487 [ 12.280684] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 9, name: kworker/u4:0 [ 12.288781] CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 5.15.134 #0 [ 12.295135] Workqueue: events_unbound deferred_probe_work_func [ 12.300964] Stack : 80e70000 8008ac80 00000000 00000004 807c776c 8145b9ec 81424c00 800520ec [ 12.309316] 808a0000 8145ba2b 8145b844 8145b838 80414178 00000001 8145b9f8 81439ea0 [ 12.317674] 00000000 00000000 807c776c 8145b838 ffffefff 00000000 00000000 ffffffea [ 12.326030] 00000081 8145b844 00000081 808a6f50 807c776c 00000000 00000000 80910000 [ 12.334391] 00111bef 00000000 00000001 00000000 00000018 00000030 00000000 80e40000 [ 12.342741] ... [ 12.345177] Call Trace: [ 12.347613] [<8000c1d0>] show_stack+0x28/0xf0 [ 12.351974] [<8038ba1c>] dump_stack_lvl+0x60/0x80 [ 12.356667] [<8005eefc>] ___might_sleep+0x124/0x138 [ 12.361547] [<806daf30>] down_read+0x24/0x88 [ 12.365807] [<803cdd20>] pci_get_slot+0x2c/0xc0 [ 12.370333] [<806d56ac>] ifx_pcie_read_config+0x164/0x330 [ 12.375735] [<803be610>] pci_bus_read_config_dword+0x6c/0xd0 [ 12.381399] [<803c20cc>] pci_bus_generic_read_dev_vendor_id+0x3c/0x1a8 [ 12.387915] [<803c27ec>] pci_scan_single_device+0x88/0x154 [ 12.393404] [<803c2928>] pci_scan_slot+0x70/0x134 [ 12.398099] [<803c3bf0>] pci_scan_child_bus_extend+0x5c/0x320 [ 12.403849] [<803c4178>] pci_scan_root_bus_bridge+0xd0/0xec [ 12.409414] [<806d45a8>] pcibios_scanbus+0xe4/0x21c [ 12.414293] [<806d4908>] register_pci_controller+0xb8/0x11c [ 12.419858] [<806d5f9c>] ifx_pcie_bios_probe+0x724/0x940 [ 12.425174] [<80417574>] platform_probe+0x38/0x90 [ 12.429868] [<80414d68>] really_probe.part.0+0xac/0x354 [ 12.435103] [<80415298>] driver_probe_device+0x4c/0x154 [ 12.440313] [<80415904>] __device_attach_driver+0xd0/0x15c [ 12.445802] [<804129d8>] bus_for_each_drv+0x70/0xb0 [ 12.450676] [<80415610>] __device_attach+0xdc/0x194 [ 12.455545] [<80413ca8>] bus_probe_device+0x9c/0xb8 [ 12.460419] [<8041420c>] deferred_probe_work_func+0x94/0xd4 [ 12.465995] [<8004fcb4>] process_one_work+0x27c/0x4c8 [ 12.471044] [<80050710>] worker_thread+0x34c/0x5f8 [ 12.475825] [<800587a8>] kthread+0x168/0x18c [ 12.480090] [<80006ef8>] ret_from_kernel_thread+0x14/0x1c Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
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| airoha | ||
| apm821xx | ||
| archs38 | ||
| armsr | ||
| at91 | ||
| ath25 | ||
| ath79 | ||
| bcm27xx | ||
| bcm47xx | ||
| bcm53xx | ||
| bcm63xx | ||
| bcm4908 | ||
| bmips | ||
| gemini | ||
| generic | ||
| imx | ||
| ipq40xx | ||
| ipq806x | ||
| kirkwood | ||
| lantiq | ||
| layerscape | ||
| malta | ||
| mediatek | ||
| mpc85xx | ||
| mvebu | ||
| mxs | ||
| octeon | ||
| octeontx | ||
| omap | ||
| oxnas | ||
| pistachio | ||
| qoriq | ||
| qualcommax | ||
| ramips | ||
| realtek | ||
| rockchip | ||
| sifiveu | ||
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| uml | ||
| x86 | ||
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| Makefile | ||