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linux/drivers/usb/dwc2
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Marek Szyprowski 3120aac6d0 usb: dwc2: gadget: don't reset gadget's driver->bus 
UDC driver should not touch gadget's driver internals, especially it
should not reset driver->bus. This wasn't harmful so far, but since
commit fc274c1e99 ("USB: gadget: Add a new bus for gadgets") gadget
subsystem got it's own bus and messing with ->bus triggers the
following NULL pointer dereference:

dwc2 12480000.hsotg: bound driver g_ether
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in: ...
CPU: 0 PID: 620 Comm: modprobe Not tainted 5.18.0-rc5-next-20220504 #11862
Hardware name: Samsung Exynos (Flattened Device Tree)
PC is at module_add_driver+0x44/0xe8
LR is at sysfs_do_create_link_sd+0x84/0xe0
...
Process modprobe (pid: 620, stack limit = 0x(ptrval))
...
 module_add_driver from bus_add_driver+0xf4/0x1e4
 bus_add_driver from driver_register+0x78/0x10c
 driver_register from usb_gadget_register_driver_owner+0x40/0xb4
 usb_gadget_register_driver_owner from do_one_initcall+0x44/0x1e0
 do_one_initcall from do_init_module+0x44/0x1c8
 do_init_module from load_module+0x19b8/0x1b9c
 load_module from sys_finit_module+0xdc/0xfc
 sys_finit_module from ret_fast_syscall+0x0/0x54
Exception stack(0xf1771fa8 to 0xf1771ff0)
...
dwc2 12480000.hsotg: new device is high-speed
---[ end trace 0000000000000000 ]---

Fix this by removing driver->bus entry reset.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20220505104618.22729-1-m.szyprowski@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-05-05 21:52:16 +02:00
..
core_intr.c usb: dwc2: Skip clock gating on Samsung SoCs 2021-07-21 09:50:27 +02:00
core.c USB: dwc2: Add OTG support for Ingenic SoCs. 2022-04-21 19:22:00 +02:00
core.h USB: dwc2: Add OTG support for Ingenic SoCs. 2022-04-21 19:22:00 +02:00
debug.h USB: dwc2: Use the correct style for SPDX License Identifier 2020-05-05 10:58:50 +03:00
debugfs.c usb: dwc2: add otg_rev and otg_caps information for gadget driver 2021-10-25 09:20:26 +02:00
drd.c usb: dwc2: drd: fix soft connect when gadget is unconfigured 2022-02-17 16:10:21 +01:00
gadget.c usb: dwc2: gadget: don't reset gadget's driver->bus 2022-05-05 21:52:16 +02:00
hcd_ddma.c usb: dwc2: Modify dwc2_readl/writel functions prototype 2018-07-30 10:39:16 +03:00
hcd_intr.c usb: dwc2: Make "trimming xfer length" a debug message 2021-01-26 18:42:15 +01:00
hcd_queue.c usb: dwc2: hcd_queue: Fix use of floating point literal 2021-11-17 15:03:34 +01:00
hcd.c usb: dwc2: do not gate off the hardware if it does not support clock gating 2022-01-06 15:27:53 +01:00
hcd.h USB: dwc2: Use the correct style for SPDX License Identifier 2020-05-05 10:58:50 +03:00
hw.h usb: dwc2: Update enter and exit partial power down functions 2021-04-09 15:16:38 +02:00
Kconfig usb: dwc2: override PHY input signals with usb role switch support 2020-10-02 13:29:13 +03:00
Makefile usb: dwc2: override PHY input signals with usb role switch support 2020-10-02 13:29:13 +03:00
params.c USB: dwc2: Add OTG support for Ingenic SoCs. 2022-04-21 19:22:00 +02:00
pci.c usb: dwc2: pci: Fix possible copy/paste issue 2021-05-27 09:45:27 +02:00
platform.c Linux 5.16-rc6 2021-12-20 09:58:10 +01:00