[v2] Bluetooth: fix connection setup in l2cap_connect

The amp_id argument of l2cap_connect() was removed in
commit 84a4bb6548a2 ("Bluetooth: HCI: Remove HCI_AMP support")

It was always called with amp_id == 0, i.e. AMP_ID_BREDR == 0x00 (ie.
non-AMP controller).  In the above commit, the code path for amp_id != 0
was preserved, although it should have used the amp_id == 0 one.

Restore the previous behavior of the non-AMP code path, to fix problems
with L2CAP connections.

Fixes: 84a4bb6548a2 ("Bluetooth: HCI: Remove HCI_AMP support")
Signed-off-by: Pauli Virtanen <pav@iki.fi>
---

Notes:
    v2: do the change in the actually right if branch
    
    Tried proofreading the commit, and this part seemed suspicious.
    Can you try if this fixes the problem?

 net/bluetooth/l2cap_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=860256

---Test result---

Test Summary:
CheckPatch                    PASS      0.79 seconds
GitLint                       FAIL      0.54 seconds
SubjectPrefix                 PASS      0.13 seconds
BuildKernel                   PASS      30.75 seconds
CheckAllWarning               PASS      33.22 seconds
CheckSparse                   PASS      39.03 seconds
CheckSmatch                   FAIL      35.74 seconds
BuildKernel32                 PASS      28.69 seconds
TestRunnerSetup               PASS      520.59 seconds
TestRunner_l2cap-tester       PASS      20.24 seconds
TestRunner_iso-tester         PASS      32.85 seconds
TestRunner_bnep-tester        PASS      4.74 seconds
TestRunner_mgmt-tester        PASS      112.00 seconds
TestRunner_rfcomm-tester      PASS      7.42 seconds
TestRunner_sco-tester         PASS      14.92 seconds
TestRunner_ioctl-tester       PASS      7.73 seconds
TestRunner_mesh-tester        PASS      5.82 seconds
TestRunner_smp-tester         PASS      6.79 seconds
TestRunner_userchan-tester    PASS      4.90 seconds
IncrementalBuild              PASS      27.56 seconds

Details
##############################
Test: GitLint - FAIL
Desc: Run gitlint
Output:
[v2] Bluetooth: fix connection setup in l2cap_connect

WARNING: I3 - ignore-body-lines: gitlint will be switching from using Python regex 'match' (match beginning) to 'search' (match anywhere) semantics. Please review your ignore-body-lines.regex option accordingly. To remove this warning, set general.regex-style-search=True. More details: https://jorisroovers.github.io/gitlint/configuration/#regex-style-search
18: B2 Line has trailing whitespace: "    "
##############################
Test: CheckSmatch - FAIL
Desc: Run smatch tool with source
Output:

Segmentation fault (core dumped)
make[4]: *** [scripts/Makefile.build:244: net/bluetooth/hci_core.o] Error 139
make[4]: *** Deleting file 'net/bluetooth/hci_core.o'
make[3]: *** [scripts/Makefile.build:485: net/bluetooth] Error 2
make[2]: *** [scripts/Makefile.build:485: net] Error 2
make[2]: *** Waiting for unfinished jobs....
Segmentation fault (core dumped)
make[4]: *** [scripts/Makefile.build:244: drivers/bluetooth/bcm203x.o] Error 139
make[4]: *** Deleting file 'drivers/bluetooth/bcm203x.o'
make[4]: *** Waiting for unfinished jobs....
make[3]: *** [scripts/Makefile.build:485: drivers/bluetooth] Error 2
make[2]: *** [scripts/Makefile.build:485: drivers] Error 2
make[1]: *** [/github/workspace/src/src/Makefile:1919: .] Error 2
make: *** [Makefile:240: __sub-make] Error 2


---
Regards,
Linux Bluetooth

Hi Pauli,

On Sun, Jun 9, 2024 at 11:06 AM Pauli Virtanen <pav@iki.fi> wrote:
>
> The amp_id argument of l2cap_connect() was removed in
> commit 84a4bb6548a2 ("Bluetooth: HCI: Remove HCI_AMP support")
>
> It was always called with amp_id == 0, i.e. AMP_ID_BREDR == 0x00 (ie.
> non-AMP controller).  In the above commit, the code path for amp_id != 0
> was preserved, although it should have used the amp_id == 0 one.
>
> Restore the previous behavior of the non-AMP code path, to fix problems
> with L2CAP connections.

While at it we could create a test case to cover this code path with
l2cap-tester.

> Fixes: 84a4bb6548a2 ("Bluetooth: HCI: Remove HCI_AMP support")
> Signed-off-by: Pauli Virtanen <pav@iki.fi>
> ---
>
> Notes:
>     v2: do the change in the actually right if branch
>
>     Tried proofreading the commit, and this part seemed suspicious.
>     Can you try if this fixes the problem?
>
>  net/bluetooth/l2cap_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> index c49e0d4b3c0d..aed025734d04 100644
> --- a/net/bluetooth/l2cap_core.c
> +++ b/net/bluetooth/l2cap_core.c
> @@ -4011,8 +4011,8 @@ static void l2cap_connect(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd,
>                                 status = L2CAP_CS_AUTHOR_PEND;
>                                 chan->ops->defer(chan);
>                         } else {
> -                               l2cap_state_change(chan, BT_CONNECT2);
> -                               result = L2CAP_CR_PEND;
> +                               l2cap_state_change(chan, BT_CONFIG);
> +                               result = L2CAP_CR_SUCCESS;
>                                 status = L2CAP_CS_NO_INFO;
>                         }
>                 } else {
> --
> 2.45.2
>
>