[RESEND PATCH v2] Bluetooth: hci_uart: fix race during initialization

[RESEND PATCH v2] Bluetooth: hci_uart: fix race during initialization

[Arseniy Krasnov]

'hci_register_dev()' calls power up function, which is executed by
kworker - 'hci_power_on()'. This function does access to bluetooth chip
using callbacks from 'hci_ldisc.c', for example 'hci_uart_send_frame()'.
Now 'hci_uart_send_frame()' checks 'HCI_UART_PROTO_READY' bit set, and
if not - it fails. Problem is that 'HCI_UART_PROTO_READY' is set after
'hci_register_dev()', and there is tiny chance that 'hci_power_on()' will
be executed before setting this bit. In that case HCI init logic fails.

Patch moves setting of 'HCI_UART_PROTO_READY' before calling function
'hci_uart_register_dev()'.

Signed-off-by: Arseniy Krasnov <oxffffaa@gmail.com>
---
 Changelog v1->v2:
 * Move 'set_bit()' before 'hci_uart_register_dev()' instead of
   adding new bit 'HCI_UART_PROTO_INIT'.

 drivers/bluetooth/hci_ldisc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 30192bb083549..07b9aa09bbe2e 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -704,12 +704,13 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
 
 	hu->proto = p;
 
+	set_bit(HCI_UART_PROTO_READY, &hu->flags);
+
 	err = hci_uart_register_dev(hu);
 	if (err) {
 		return err;
 	}
 
-	set_bit(HCI_UART_PROTO_READY, &hu->flags);
 	return 0;
 }
 
-- 
2.30.1

RE: [RESEND,v2] Bluetooth: hci_uart: fix race during initialization

[bluez.test.bot]

[-- Attachment #1: Type: text/plain, Size: 2028 bytes --]

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=929721

---Test result---

Test Summary:
CheckPatch                    PENDING   0.29 seconds
GitLint                       PENDING   0.19 seconds
SubjectPrefix                 PASS      0.09 seconds
BuildKernel                   PASS      24.53 seconds
CheckAllWarning               PASS      27.01 seconds
CheckSparse                   PASS      30.67 seconds
BuildKernel32                 PASS      24.47 seconds
TestRunnerSetup               PASS      428.20 seconds
TestRunner_l2cap-tester       PASS      23.35 seconds
TestRunner_iso-tester         PASS      33.47 seconds
TestRunner_bnep-tester        PASS      4.72 seconds
TestRunner_mgmt-tester        FAIL      118.88 seconds
TestRunner_rfcomm-tester      PASS      7.58 seconds
TestRunner_sco-tester         PASS      9.33 seconds
TestRunner_ioctl-tester       PASS      7.97 seconds
TestRunner_mesh-tester        PASS      5.85 seconds
TestRunner_smp-tester         PASS      6.93 seconds
TestRunner_userchan-tester    PASS      4.97 seconds
IncrementalBuild              PENDING   0.76 seconds

Details
##############################
Test: CheckPatch - PENDING
Desc: Run checkpatch.pl script
Output:

##############################
Test: GitLint - PENDING
Desc: Run gitlint
Output:

##############################
Test: TestRunner_mgmt-tester - FAIL
Desc: Run mgmt-tester with test-runner
Output:
Total: 490, Passed: 484 (98.8%), Failed: 2, Not Run: 4

Failed Test Cases
LL Privacy - Add Device 2 (2 Devices to AL)          Failed       0.162 seconds
LL Privacy - Add Device 3 (AL is full)               Failed       0.193 seconds
##############################
Test: IncrementalBuild - PENDING
Desc: Incremental build with the patches in the series
Output:



---
Regards,
Linux Bluetooth

Re: [RESEND PATCH v2] Bluetooth: hci_uart: fix race during initialization

[patchwork-bot+bluetooth]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@intel.com>:

On Sat, 1 Feb 2025 19:24:31 +0300 you wrote:
> 'hci_register_dev()' calls power up function, which is executed by
> kworker - 'hci_power_on()'. This function does access to bluetooth chip
> using callbacks from 'hci_ldisc.c', for example 'hci_uart_send_frame()'.
> Now 'hci_uart_send_frame()' checks 'HCI_UART_PROTO_READY' bit set, and
> if not - it fails. Problem is that 'HCI_UART_PROTO_READY' is set after
> 'hci_register_dev()', and there is tiny chance that 'hci_power_on()' will
> be executed before setting this bit. In that case HCI init logic fails.
> 
> [...]

Here is the summary with links:
  - [RESEND,v2] Bluetooth: hci_uart: fix race during initialization
    https://git.kernel.org/bluetooth/bluetooth-next/c/c411c62cc133

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

[RESEND PATCH v2] Bluetooth: hci_uart: fix race during initialization

[Arseniy Krasnov]

'hci_register_dev()' calls power up function, which is executed by
kworker - 'hci_power_on()'. This function does access to bluetooth chip
using callbacks from 'hci_ldisc.c', for example 'hci_uart_send_frame()'.
Now 'hci_uart_send_frame()' checks 'HCI_UART_PROTO_READY' bit set, and
if not - it fails. Problem is that 'HCI_UART_PROTO_READY' is set after
'hci_register_dev()', and there is tiny chance that 'hci_power_on()' will
be executed before setting this bit. In that case HCI init logic fails.

Patch moves setting of 'HCI_UART_PROTO_READY' before calling function
'hci_uart_register_dev()'.

Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
---
 Changelog v1->v2:
 * Move 'set_bit()' before 'hci_uart_register_dev()' instead of
   adding new bit 'HCI_UART_PROTO_INIT'.

 drivers/bluetooth/hci_ldisc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 30192bb083549..07b9aa09bbe2e 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -704,12 +704,13 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
 
 	hu->proto = p;
 
+	set_bit(HCI_UART_PROTO_READY, &hu->flags);
+
 	err = hci_uart_register_dev(hu);
 	if (err) {
 		return err;
 	}
 
-	set_bit(HCI_UART_PROTO_READY, &hu->flags);
 	return 0;
 }
 
-- 
2.30.1

RE: [RESEND,v2] Bluetooth: hci_uart: fix race during initialization

[bluez.test.bot]

[-- Attachment #1: Type: text/plain, Size: 1948 bytes --]

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=929318

---Test result---

Test Summary:
CheckPatch                    PENDING   0.24 seconds
GitLint                       PENDING   0.19 seconds
SubjectPrefix                 PASS      0.11 seconds
BuildKernel                   PASS      24.52 seconds
CheckAllWarning               PASS      26.96 seconds
CheckSparse                   PASS      30.12 seconds
BuildKernel32                 PASS      24.45 seconds
TestRunnerSetup               PASS      422.74 seconds
TestRunner_l2cap-tester       PASS      20.28 seconds
TestRunner_iso-tester         PASS      29.18 seconds
TestRunner_bnep-tester        PASS      4.83 seconds
TestRunner_mgmt-tester        FAIL      119.73 seconds
TestRunner_rfcomm-tester      PASS      7.42 seconds
TestRunner_sco-tester         PASS      9.31 seconds
TestRunner_ioctl-tester       PASS      8.02 seconds
TestRunner_mesh-tester        PASS      5.96 seconds
TestRunner_smp-tester         PASS      7.02 seconds
TestRunner_userchan-tester    PASS      4.99 seconds
IncrementalBuild              PENDING   0.43 seconds

Details
##############################
Test: CheckPatch - PENDING
Desc: Run checkpatch.pl script
Output:

##############################
Test: GitLint - PENDING
Desc: Run gitlint
Output:

##############################
Test: TestRunner_mgmt-tester - FAIL
Desc: Run mgmt-tester with test-runner
Output:
Total: 490, Passed: 485 (99.0%), Failed: 1, Not Run: 4

Failed Test Cases
LL Privacy - Set Flags 3 (2 Devices to RL)           Failed       0.198 seconds
##############################
Test: IncrementalBuild - PENDING
Desc: Incremental build with the patches in the series
Output:



---
Regards,
Linux Bluetooth