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Ludovico de Nittis aacecaee1b Bluetooth: hci_event: Treat UNKNOWN_CONN_ID on disconnect as success 
[ Upstream commit 2f050a5392 ]

When the host sends an HCI_OP_DISCONNECT command, the controller may
respond with the status HCI_ERROR_UNKNOWN_CONN_ID (0x02). E.g. this can
happen on resume from suspend, if the link was terminated by the remote
device before the event mask was correctly set.

This is a btmon snippet that shows the issue:
```
> ACL Data RX: Handle 3 flags 0x02 dlen 12
      L2CAP: Disconnection Request (0x06) ident 5 len 4
        Destination CID: 65
        Source CID: 72
< ACL Data TX: Handle 3 flags 0x00 dlen 12
      L2CAP: Disconnection Response (0x07) ident 5 len 4
        Destination CID: 65
        Source CID: 72
> ACL Data RX: Handle 3 flags 0x02 dlen 12
      L2CAP: Disconnection Request (0x06) ident 6 len 4
        Destination CID: 64
        Source CID: 71
< ACL Data TX: Handle 3 flags 0x00 dlen 12
      L2CAP: Disconnection Response (0x07) ident 6 len 4
        Destination CID: 64
        Source CID: 71
< HCI Command: Set Event Mask (0x03|0x0001) plen 8
        Mask: 0x3dbff807fffbffff
          Inquiry Complete
          Inquiry Result
          Connection Complete
          Connection Request
          Disconnection Complete
          Authentication Complete
[...]
< HCI Command: Disconnect (0x01|0x0006) plen 3
        Handle: 3 Address: 78:20:A5:4A:DF:28 (Nintendo Co.,Ltd)
        Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4
      Disconnect (0x01|0x0006) ncmd 1
        Status: Unknown Connection Identifier (0x02)
```

Currently, the hci_cs_disconnect function treats any non-zero status
as a command failure. This can be misleading because the connection is
indeed being terminated and the controller is confirming that is has no
knowledge of that connection handle. Meaning that the initial request of
disconnecting a device should be treated as done.

With this change we allow the function to proceed, following the success
path, which correctly calls `mgmt_device_disconnected` and ensures a
consistent state.

Link: https://github.com/bluez/bluez/issues/1226
Fixes: 182ee45da0 ("Bluetooth: hci_sync: Rework hci_suspend_notifier")
Signed-off-by: Ludovico de Nittis <ludovico.denittis@collabora.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-09-04 15:31:46 +02:00
arch powerpc/kvm: Fix ifdef to remove build warning 2025-09-04 15:31:45 +02:00
block block: Introduce bio_needs_zone_write_plugging() 2025-08-20 18:30:51 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: jitter - fix intermediary handling 2025-08-20 18:30:42 +02:00
Documentation mptcp: disable add_addr retransmission when timeout is 0 2025-08-28 16:31:07 +02:00
drivers net: macb: fix unregister_netdev call order in macb_remove() 2025-09-04 15:31:46 +02:00
fs erofs: fix atomic context detection when !CONFIG_DEBUG_LOCK_ALLOC 2025-09-04 15:31:44 +02:00
include of: reserved_mem: Restructure call site for dma_contiguous_early_fixup() 2025-09-04 15:31:45 +02:00
init io_uring: fix breakage in EXPERT menu 2025-08-15 12:13:32 +02:00
io_uring io_uring/futex: ensure io_futex_wait() cleans up properly on failure 2025-08-28 16:31:05 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel of: reserved_mem: Restructure call site for dma_contiguous_early_fixup() 2025-09-04 15:31:45 +02:00
lib lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-20 18:30:49 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/memory-failure: fix infinite UCE for VM_PFNMAP pfn 2025-08-28 16:31:05 +02:00
net Bluetooth: hci_event: Treat UNKNOWN_CONN_ID on disconnect as success 2025-09-04 15:31:46 +02:00
rust rust: alloc: fix rusttest by providing Cmalloc::aligned_layout too 2025-08-28 16:31:13 +02:00
samples samples: mei: Fix building on musl libc 2025-08-15 12:13:38 +02:00
scripts kconfig: lxdialog: fix 'space' to (de)select options 2025-08-20 18:30:48 +02:00
security apparmor: Fix 8-byte alignment for initial dfa blob streams 2025-08-28 16:30:56 +02:00
sound ASoC: codecs: tx-macro: correct tx_macro_component_drv name 2025-09-04 15:31:44 +02:00
tools perf symbol-minimal: Fix ehdr reading in filename__read_build_id 2025-09-04 15:31:43 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-07-17 18:37:08 +02:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -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 self from DSA entry 2024-11-03 12:52:38 -08:00
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: Update Alexey Makhalov's email address 2025-05-22 14:29:46 +02:00
Makefile Linux 6.12.44 2025-08-28 16:31:16 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.