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linux/drivers/usb/dwc3
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Peter Chen 4bf584a03e usb: dwc3: core: fix kernel panic when do reboot 
When do system reboot, it calls dwc3_shutdown and the whole debugfs
for dwc3 has removed first, when the gadget tries to do deinit, and
remove debugfs for its endpoints, it meets NULL pointer dereference
issue when call debugfs_lookup. Fix it by removing the whole dwc3
debugfs later than dwc3_drd_exit.

[ 2924.958838] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000002
....
[ 2925.030994] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[ 2925.037005] pc : inode_permission+0x2c/0x198
[ 2925.041281] lr : lookup_one_len_common+0xb0/0xf8
[ 2925.045903] sp : ffff80001276ba70
[ 2925.049218] x29: ffff80001276ba70 x28: ffff0000c01f0000 x27: 0000000000000000
[ 2925.056364] x26: ffff800011791e70 x25: 0000000000000008 x24: dead000000000100
[ 2925.063510] x23: dead000000000122 x22: 0000000000000000 x21: 0000000000000001
[ 2925.070652] x20: ffff8000122c6188 x19: 0000000000000000 x18: 0000000000000000
[ 2925.077797] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000004
[ 2925.084943] x14: ffffffffffffffff x13: 0000000000000000 x12: 0000000000000030
[ 2925.092087] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f x9 : ffff8000102b2420
[ 2925.099232] x8 : 7f7f7f7f7f7f7f7f x7 : feff73746e2f6f64 x6 : 0000000000008080
[ 2925.106378] x5 : 61c8864680b583eb x4 : 209e6ec2d263dbb7 x3 : 000074756f307065
[ 2925.113523] x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff8000122c6188
[ 2925.120671] Call trace:
[ 2925.123119]  inode_permission+0x2c/0x198
[ 2925.127042]  lookup_one_len_common+0xb0/0xf8
[ 2925.131315]  lookup_one_len_unlocked+0x34/0xb0
[ 2925.135764]  lookup_positive_unlocked+0x14/0x50
[ 2925.140296]  debugfs_lookup+0x68/0xa0
[ 2925.143964]  dwc3_gadget_free_endpoints+0x84/0xb0
[ 2925.148675]  dwc3_gadget_exit+0x28/0x78
[ 2925.152518]  dwc3_drd_exit+0x100/0x1f8
[ 2925.156267]  dwc3_remove+0x11c/0x120
[ 2925.159851]  dwc3_shutdown+0x14/0x20
[ 2925.163432]  platform_shutdown+0x28/0x38
[ 2925.167360]  device_shutdown+0x15c/0x378
[ 2925.171291]  kernel_restart_prepare+0x3c/0x48
[ 2925.175650]  kernel_restart+0x1c/0x68
[ 2925.179316]  __do_sys_reboot+0x218/0x240
[ 2925.183247]  __arm64_sys_reboot+0x28/0x30
[ 2925.187262]  invoke_syscall+0x48/0x100
[ 2925.191017]  el0_svc_common.constprop.0+0x48/0xc8
[ 2925.195726]  do_el0_svc+0x28/0x88
[ 2925.199045]  el0_svc+0x20/0x30
[ 2925.202104]  el0_sync_handler+0xa8/0xb0
[ 2925.205942]  el0_sync+0x148/0x180
[ 2925.209270] Code: a9025bf5 2a0203f5 121f0056 370802b5 (79400660)
[ 2925.215372] ---[ end trace 124254d8e485a58b ]---
[ 2925.220012] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 2925.227676] Kernel Offset: disabled
[ 2925.231164] CPU features: 0x00001001,20000846
[ 2925.235521] Memory Limit: none
[ 2925.238580] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Fixes: 8d396bb0a5 ("usb: dwc3: debugfs: Add and remove endpoint dirs dynamically")
Cc: Jack Pham <jackp@codeaurora.org>
Tested-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20210608105656.10795-1-peter.chen@kernel.org
(cherry picked from commit 2a04276781)
Link: https://lore.kernel.org/r/20210615080847.GA10432@jackp-linux.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-15 12:20:26 +02:00
..
core.c usb: dwc3: core: fix kernel panic when do reboot 2021-06-15 12:20:26 +02:00
core.h usb: dwc3: gadget: Rename EOPF event macros to Suspend 2021-05-10 14:45:49 +02:00
debug.h usb: dwc3: debugfs: Add and remove endpoint dirs dynamically 2021-06-03 20:28:23 +02:00
debugfs.c usb: dwc3: debugfs: Add and remove endpoint dirs dynamically 2021-06-03 20:28:23 +02:00
drd.c usb: dwc3: drd: Improve dwc3_get_extcon() style 2020-12-28 15:51:40 +01:00
dwc3-exynos.c usb: dwc3: exynos: fix incorrect kernel-doc comment syntax 2021-04-02 15:20:54 +02:00
dwc3-haps.c usb: dwc3: haps: Constify the software node 2021-02-04 15:42:06 +01:00
dwc3-imx8mp.c usb: dwc3: imx8mp: fix error return code in dwc3_imx8mp_probe() 2021-05-10 14:58:41 +02:00
dwc3-keystone.c usb: dwc3: fix incorrect kernel-doc comment syntax in files 2021-04-02 15:20:51 +02:00
dwc3-meson-g12a.c usb: dwc3-meson-g12a: fix usb2 PHY glue init when phy0 is disabled 2021-06-04 12:58:55 +02:00
dwc3-of-simple.c usb: dwc3: Add driver for Xilinx platforms 2021-03-23 12:48:14 +01:00
dwc3-omap.c usb: dwc3: omap: improve extcon initialization 2021-05-10 15:04:37 +02:00
dwc3-pci.c usb: dwc3: pci: Enable usb2-gadget-lpm-disable for Intel Merrifield 2021-05-10 14:40:21 +02:00
dwc3-qcom.c usb: dwc3: qcom: Detect DWC3 DT-nodes using compatible string 2021-04-10 10:46:09 +02:00
dwc3-st.c usb: dwc3: st: fix incorrect kernel-doc comment syntax in file 2021-04-02 15:20:46 +02:00
dwc3-xilinx.c usb: dwc3: xilinx: Remove the extra freeing of clocks 2021-04-09 16:05:32 +02:00
ep0.c usb: dwc3: ep0: fix NULL pointer exception 2021-06-09 11:03:32 +02:00
gadget.c usb: dwc3: debugfs: Add and remove endpoint dirs dynamically 2021-06-03 20:28:23 +02:00
gadget.h usb: dwc3: add cancelled reasons for dwc3 requests 2021-04-02 15:27:36 +02:00
host.c usb: dwc3: host: Use software node API with the properties 2021-02-05 10:08:19 +01:00
io.h usb: dwc3: fix incorrect kernel-doc comment syntax in files 2021-04-02 15:20:51 +02:00
Kconfig usb: dwc3: Add driver for Xilinx platforms 2021-03-23 12:48:14 +01:00
Makefile usb: dwc3: Add driver for Xilinx platforms 2021-03-23 12:48:14 +01:00
trace.c usb: dwc3: fix incorrect kernel-doc comment syntax in files 2021-04-02 15:20:51 +02:00
trace.h usb: dwc3: fix incorrect kernel-doc comment syntax in files 2021-04-02 15:20:51 +02:00
ulpi.c usb: dwc3: ulpi: Fix USB2.0 HS/FS/LS PHY suspend regression 2020-12-28 15:55:44 +01:00