[Bug 220061] [REGRESSION, BISECTED] Multiple Bluetooth devices cannot be paired under Linux 6.14.4

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220061

--- Comment #5 from frederic.danis@collabora.com ---
BlueZ is replying to L2CAP connection before encryption key size has been
returned by the chipset:

< HCI Command: Read Encryption Key.. (0x05|0x0008) plen 2  #51 [hci0] 14.630430
        Handle: 71 Address: 40:1B:5F:B9:B2:8B (WEIFANG GOERTEK ELECTRONICS
CO.,>
> ACL Data RX: Handle 71 flags 0x02 dlen 12                #52 [hci0] 14.632472
      L2CAP: Connection Request (0x02) ident 4 len 4
        PSM: 17 (0x0011)
        Source CID: 65
< ACL Data TX: Handle 71 flags 0x00 dlen 16                #53 [hci0] 14.632509
      L2CAP: Connection Response (0x03) ident 4 len 8
        Destination CID: 0
        Source CID: 65
        Result: Connection refused - security block (0x0003)
        Status: No further information available (0x0000)
> HCI Event: Command Complete (0x0e) plen 7                #54 [hci0] 14.635400
      Read Encryption Key Size (0x05|0x0008) ncmd 1
        Status: Success (0x00)
        Handle: 71 Address: 40:1B:5F:B9:B2:8B (WEIFANG GOERTEK ELECTRONICS
CO.,>
        Key size: 16

When testing DS4 connection with my setup I got:

< HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2 #37 [hci0]
9.315363
        Handle: 11 Address: 58:10:31:47:09:CF (OUI 58-10-31)
> HCI Event: Command Complete (0x0e) plen 7                  #38 [hci0]
> 9.315883
      Read Encryption Key Size (0x05|0x0008) ncmd 1
        Status: Success (0x00)
        Handle: 11 Address: 58:10:31:47:09:CF (OUI 58-10-31)
        Key size: 16
> ACL Data RX: Handle 11 flags 0x02 dlen 12                  #39 [hci0]
> 9.428060
      L2CAP: Connection Request (0x02) ident 4 len 4
        PSM: 17 (0x0011)
        Source CID: 65
< ACL Data TX: Handle 11 flags 0x00 dlen 16                  #40 [hci0]
9.428106
      L2CAP: Connection Response (0x03) ident 4 len 8
        Destination CID: 64
        Source CID: 65
        Result: Connection successful (0x0000)
        Status: No further information available (0x0000)

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