[PATCH v2] Bluetooth: btintel: Attempt to reset if Read Version fail during setup

[PATCH v2] Bluetooth: btintel: Attempt to reset if Read Version fail during setup

[Luiz Augusto von Dentz]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

During setup callback the code would attempt to send Read Version which
sometimes can fail due to ncmd being set to 0 which would block any
command from being send which is why INTEL_BROKEN_INITIAL_NCMD was
introduced.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 drivers/bluetooth/btintel.c | 70 ++++++++++++++++++++++++-------------
 1 file changed, 45 insertions(+), 25 deletions(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index a19ebe47bd95..b787540a1031 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -430,18 +430,18 @@ int btintel_set_event_mask_mfg(struct hci_dev *hdev, bool debug)
 }
 EXPORT_SYMBOL_GPL(btintel_set_event_mask_mfg);
 
+static struct sk_buff *btintel_read_version_skb(struct hci_dev *hdev,
+						u32 plen, const char *param)
+{
+	return __hci_cmd_sync(hdev, 0xfc05, plen, param, HCI_CMD_TIMEOUT);
+}
+
 int btintel_read_version(struct hci_dev *hdev, struct intel_version *ver)
 {
 	struct sk_buff *skb;
 
-	skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
-	if (IS_ERR(skb)) {
-		bt_dev_err(hdev, "Reading Intel version information failed (%ld)",
-			   PTR_ERR(skb));
-		return PTR_ERR(skb);
-	}
-
-	if (!skb || skb->len != sizeof(*ver)) {
+	skb = btintel_read_version_skb(hdev, 0, NULL);
+	if (IS_ERR(skb) || skb->len != sizeof(*ver)) {
 		bt_dev_err(hdev, "Intel version event size mismatch");
 		kfree_skb(skb);
 		return -EILSEQ;
@@ -655,12 +655,9 @@ static int btintel_read_version_tlv(struct hci_dev *hdev,
 	struct sk_buff *skb;
 	const u8 param[1] = { 0xFF };
 
-	if (!version)
-		return -EINVAL;
-
-	skb = __hci_cmd_sync(hdev, 0xfc05, 1, param, HCI_CMD_TIMEOUT);
+	skb = btintel_read_version_skb(hdev, sizeof(param), param);
 	if (IS_ERR(skb)) {
-		bt_dev_err(hdev, "Reading Intel version information failed (%ld)",
+		bt_dev_err(hdev, "Intel Read Version command failed (%ld)",
 			   PTR_ERR(skb));
 		return PTR_ERR(skb);
 	}
@@ -672,12 +669,44 @@ static int btintel_read_version_tlv(struct hci_dev *hdev,
 		return -EIO;
 	}
 
-	btintel_parse_version_tlv(hdev, version, skb);
+	if (version)
+		btintel_parse_version_tlv(hdev, version, skb);
 
 	kfree_skb(skb);
 	return 0;
 }
 
+static struct sk_buff *btintel_read_version_setup(struct hci_dev *hdev)
+{
+	int err;
+	struct sk_buff *skb;
+	const u8 param[1] = { 0xFF };
+
+	skb = btintel_read_version_skb(hdev, sizeof(param), param);
+	if (!IS_ERR(skb))
+		goto done;
+
+	/* Attempt to reset if the command times out since this could be
+	 * because the ncmd is set to 0 therefore no command will be able to be
+	 * sent.
+	 */
+	err = hci_reset_sync(hdev);
+	if (err)
+		return ERR_PTR(err);
+
+	skb = btintel_read_version_skb(hdev, sizeof(param), param);
+	if (IS_ERR(skb))
+		return skb;
+
+done:
+	if (skb->data[0]) {
+		kfree_skb(skb);
+		return ERR_PTR(-EIO);
+	}
+
+	return skb;
+}
+
 /* ------- REGMAP IBT SUPPORT ------- */
 
 #define IBT_REG_MODE_8BIT  0x00
@@ -2821,7 +2850,6 @@ static void btintel_print_fseq_info(struct hci_dev *hdev)
 
 static int btintel_setup_combined(struct hci_dev *hdev)
 {
-	const u8 param[1] = { 0xFF };
 	struct intel_version ver;
 	struct intel_version_tlv ver_tlv;
 	struct sk_buff *skb;
@@ -2862,18 +2890,10 @@ static int btintel_setup_combined(struct hci_dev *hdev)
 	 * command has a parameter and returns a correct version information.
 	 * So, it uses new format to support both legacy and new format.
 	 */
-	skb = __hci_cmd_sync(hdev, 0xfc05, 1, param, HCI_CMD_TIMEOUT);
+	skb = btintel_read_version_setup(hdev);
 	if (IS_ERR(skb)) {
-		bt_dev_err(hdev, "Reading Intel version command failed (%ld)",
+		bt_dev_err(hdev, "Intel Read Version command failed (%ld)",
 			   PTR_ERR(skb));
-		return PTR_ERR(skb);
-	}
-
-	/* Check the status */
-	if (skb->data[0]) {
-		bt_dev_err(hdev, "Intel Read Version command failed (%02x)",
-			   skb->data[0]);
-		err = -EIO;
 		goto exit_error;
 	}
 
-- 
2.44.0

RE: [v2] Bluetooth: btintel: Attempt to reset if Read Version fail during setup

[bluez.test.bot]

[-- Attachment #1: Type: text/plain, Size: 2312 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=842853

---Test result---

Test Summary:
CheckPatch                    PASS      0.67 seconds
GitLint                       PASS      0.30 seconds
SubjectPrefix                 PASS      0.11 seconds
BuildKernel                   PASS      30.38 seconds
CheckAllWarning               PASS      33.52 seconds
CheckSparse                   PASS      38.23 seconds
CheckSmatch                   FAIL      35.58 seconds
BuildKernel32                 PASS      30.23 seconds
TestRunnerSetup               PASS      527.92 seconds
TestRunner_l2cap-tester       PASS      18.27 seconds
TestRunner_iso-tester         PASS      28.21 seconds
TestRunner_bnep-tester        PASS      4.67 seconds
TestRunner_mgmt-tester        PASS      109.49 seconds
TestRunner_rfcomm-tester      PASS      7.28 seconds
TestRunner_sco-tester         PASS      14.98 seconds
TestRunner_ioctl-tester       PASS      7.61 seconds
TestRunner_mesh-tester        PASS      5.74 seconds
TestRunner_smp-tester         PASS      6.77 seconds
TestRunner_userchan-tester    PASS      4.89 seconds
IncrementalBuild              PASS      27.69 seconds

Details
##############################
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