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Stefan Wahren e92f79d582 usb: dwc2: Fix HCD port connection race 
commit 1cf1bd88f1 upstream.

On Raspberry Pis without onboard USB hub frequent device reconnects
can trigger a interrupt storm after DWC2 entered host clock gating.
This is caused by a race between _dwc2_hcd_suspend() and the port
interrupt, which sets port_connect_status. The issue occurs if
port_connect_status is still 1, but there is no connection anymore:

usb 1-1: USB disconnect, device number 25
dwc2 3f980000.usb: _dwc2_hcd_suspend: port_connect_status: 1
dwc2 3f980000.usb: Entering host clock gating.
Disabling IRQ #66
irq 66: nobody cared (try booting with the "irqpoll" option)
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-gc1bb81b13202-dirty #322
Hardware name: BCM2835
Call trace:
 unwind_backtrace from show_stack+0x10/0x14
 show_stack from dump_stack_lvl+0x50/0x64
 dump_stack_lvl from __report_bad_irq+0x38/0xc0
 __report_bad_irq from note_interrupt+0x2ac/0x2f4
 note_interrupt from handle_irq_event+0x88/0x8c
 handle_irq_event from handle_level_irq+0xb4/0x1ac
 handle_level_irq from generic_handle_domain_irq+0x24/0x34
 generic_handle_domain_irq from bcm2836_chained_handle_irq+0x24/0x28
 bcm2836_chained_handle_irq from generic_handle_domain_irq+0x24/0x34
 generic_handle_domain_irq from generic_handle_arch_irq+0x34/0x44
 generic_handle_arch_irq from __irq_svc+0x88/0xb0
 Exception stack(0xc1d01f20 to 0xc1d01f68)
 1f20: 0004ef3c 00000001 00000000 00000000 c1d09780 c1f6bb5c c1d04e54 c1c60ca8
 1f40: c1d04e94 00000000 00000000 c1d092a8 c1f6af20 c1d01f70 c1211b98 c1212f40
 1f60: 60000013 ffffffff
 __irq_svc from default_idle_call+0x1c/0xb0
 default_idle_call from do_idle+0x21c/0x284
 do_idle from cpu_startup_entry+0x28/0x2c
 cpu_startup_entry from kernel_init+0x0/0x12c
handlers:
 [<e3a25c00>] dwc2_handle_common_intr
 [<58bf98a3>] usb_hcd_irq
Disabling IRQ #66

So avoid this by reading the connection status directly.

Fixes: 113f86d0c3 ("usb: dwc2: Update partial power down entering by system suspend")
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Link: https://lore.kernel.org/r/20241202001631.75473-4-wahrenst@gmx.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-19 18:08:49 +01:00
arch arm64: smccc: Remove broken support for SMCCCv1.3 SVE discard hint 2024-12-14 19:54:53 +01:00
block blk-cgroup: Fix UAF in blkcg_unpin_online() 2024-12-19 18:08:48 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: api - Add crypto_clone_tfm 2024-12-14 19:53:51 +01:00
Documentation PCI: Add 'reset_subordinate' to reset hierarchy below bridge 2024-12-14 19:54:48 +01:00
drivers usb: dwc2: Fix HCD port connection race 2024-12-19 18:08:49 +01:00
fs ksmbd: fix racy issue from session lookup and expire 2024-12-19 18:08:48 +01:00
include PM / devfreq: Fix build issues with devfreq disabled 2024-12-14 19:54:55 +01:00
init initramfs: avoid filename buffer overrun 2024-12-14 19:53:14 +01:00
io_uring io_uring: wake up optimisations 2024-12-14 19:54:52 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-14 19:54:06 +01:00
kernel bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors 2024-12-19 18:08:48 +01:00
lib lib: stackinit: hide never-taken branch from compiler 2024-12-14 19:54:37 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: call the security_mmap_file() LSM hook in remap_file_pages() 2024-12-14 19:54:53 +01:00
net tcp: check space before adding MPTCP SYN options 2024-12-19 18:08:48 +01:00
rust rust: macros: provide correct provenance when constructing THIS_MODULE 2024-10-17 15:22:24 +02:00
samples samples/bpf: Fix a resource leak 2024-12-14 19:54:40 +01:00
scripts modpost: Add .irqentry.text to OTHER_SECTIONS 2024-12-14 19:54:35 +01:00
security apparmor: test: Fix memory leak for aa_unpack_strdup() 2024-12-14 19:53:59 +01:00
sound ALSA: usb-audio: Add implicit feedback quirk for Yamaha THR5 2024-12-19 18:08:48 +01:00
tools verification/dot2: Improve dot parser robustness 2024-12-14 19:54:47 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:21:15 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add leah to 6.1 MAINTAINERS file 2024-05-17 11:56:16 +02:00
Makefile Linux 6.1.120 2024-12-14 19:54:56 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.