[v1] Bluetooth: Optimize devcoredump API hci_devcd_init()

Commit Message

Zijun Hu April 11, 2023, 11:49 a.m. UTC

API hci_devcd_init() stores u32 type to memory without specific byte
order, let us store with little endian in order to be loaded and
parsed by devcoredump core rightly.

Signed-off-by: Zijun Hu <[e-mail]>
---
 net/bluetooth/coredump.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Comments

[e-mail] April 11, 2023, 12:41 p.m. UTC | #1

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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=738746

---Test result---

Test Summary:
CheckPatch                    PASS      0.69 seconds
GitLint                       PASS      0.35 seconds
SubjectPrefix                 PASS      0.13 seconds
BuildKernel                   PASS      32.61 seconds
CheckAllWarning               PASS      35.87 seconds
CheckSparse                   PASS      40.72 seconds
CheckSmatch                   PASS      111.13 seconds
BuildKernel32                 PASS      31.55 seconds
TestRunnerSetup               PASS      448.09 seconds
TestRunner_l2cap-tester       PASS      16.55 seconds
TestRunner_iso-tester         PASS      16.25 seconds
TestRunner_bnep-tester        PASS      5.26 seconds
TestRunner_mgmt-tester        PASS      111.33 seconds
TestRunner_rfcomm-tester      PASS      8.35 seconds
TestRunner_sco-tester         PASS      7.69 seconds
TestRunner_ioctl-tester       PASS      8.95 seconds
TestRunner_mesh-tester        PASS      6.70 seconds
TestRunner_smp-tester         PASS      7.61 seconds
TestRunner_userchan-tester    PASS      5.46 seconds
IncrementalBuild              PASS      28.56 seconds



---
Regards,
Linux Bluetooth

Luiz Augusto von Dentz April 14, 2023, 9:03 p.m. UTC | #2

Hi Zijun,

On Tue, Apr 11, 2023 at 4:49 AM Zijun Hu <[e-mail]> wrote:
>
> API hci_devcd_init() stores u32 type to memory without specific byte
> order, let us store with little endian in order to be loaded and
> parsed by devcoredump core rightly.

This looks like a fix if devcoredump expects little endian, so I'd
suggest rephrasing to state it in the subject line, also add the Fixes
tag for the commit that introduces this problem.

> Signed-off-by: Zijun Hu <[e-mail]>
> ---
>  net/bluetooth/coredump.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/net/bluetooth/coredump.c b/net/bluetooth/coredump.c
> index 08fa98505454..d2d2624ec708 100644
> --- a/net/bluetooth/coredump.c
> +++ b/net/bluetooth/coredump.c
> @@ -5,6 +5,7 @@
>
>  #include <linux/devcoredump.h>
>
> +#include <asm/unaligned.h>
>  #include <net/bluetooth/bluetooth.h>
>  #include <net/bluetooth/hci_core.h>
>
> @@ -180,25 +181,25 @@ static int hci_devcd_prepare(struct hci_dev *hdev, u32 dump_size)
>
>  static void hci_devcd_handle_pkt_init(struct hci_dev *hdev, struct sk_buff *skb)
>  {
> -       u32 *dump_size;
> +       u32 dump_size;
>
>         if (hdev->dump.state != HCI_DEVCOREDUMP_IDLE) {
>                 DBG_UNEXPECTED_STATE();
>                 return;
>         }
>
> -       if (skb->len != sizeof(*dump_size)) {
> +       if (skb->len != sizeof(dump_size)) {
>                 bt_dev_dbg(hdev, "Invalid dump init pkt");
>                 return;
>         }
>
> -       dump_size = skb_pull_data(skb, sizeof(*dump_size));
> -       if (!*dump_size) {
> +       dump_size = get_unaligned_le32(skb_pull_data(skb, 4));
> +       if (!dump_size) {
>                 bt_dev_err(hdev, "Zero size dump init pkt");
>                 return;
>         }
>
> -       if (hci_devcd_prepare(hdev, *dump_size)) {
> +       if (hci_devcd_prepare(hdev, dump_size)) {
>                 bt_dev_err(hdev, "Failed to prepare for dump");
>                 return;
>         }
> @@ -441,7 +442,7 @@ int hci_devcd_init(struct hci_dev *hdev, u32 dump_size)
>                 return -ENOMEM;
>
>         hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_INIT;
> -       skb_put_data(skb, &dump_size, sizeof(dump_size));
> +       put_unaligned_le32(dump_size, skb_put(skb, 4));
>
>         skb_queue_tail(&hdev->dump.dump_q, skb);
>         queue_work(hdev->workqueue, &hdev->dump.dump_rx);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
>

[e-mail] April 17, 2023, 6:30 p.m. UTC | #3

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <[e-mail]>:

On Tue, 11 Apr 2023 19:49:38 +0800 you wrote:
> API hci_devcd_init() stores u32 type to memory without specific byte
> order, let us store with little endian in order to be loaded and
> parsed by devcoredump core rightly.
> 
> Signed-off-by: Zijun Hu <[e-mail]>
> ---
>  net/bluetooth/coredump.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)

Here is the summary with links:
  - [v1] Bluetooth: Optimize devcoredump API hci_devcd_init()
    https://git.kernel.org/bluetooth/bluetooth-next/c/61cad9af36db

You are awesome, thank you!

Patch

diff --git a/net/bluetooth/coredump.c b/net/bluetooth/coredump.c
index 08fa98505454..d2d2624ec708 100644
--- a/net/bluetooth/coredump.c
+++ b/net/bluetooth/coredump.c
@@ -5,6 +5,7 @@ 
 
 #include <linux/devcoredump.h>
 
+#include <asm/unaligned.h>
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
@@ -180,25 +181,25 @@  static int hci_devcd_prepare(struct hci_dev *hdev, u32 dump_size)
 
 static void hci_devcd_handle_pkt_init(struct hci_dev *hdev, struct sk_buff *skb)
 {
-	u32 *dump_size;
+	u32 dump_size;
 
 	if (hdev->dump.state != HCI_DEVCOREDUMP_IDLE) {
 		DBG_UNEXPECTED_STATE();
 		return;
 	}
 
-	if (skb->len != sizeof(*dump_size)) {
+	if (skb->len != sizeof(dump_size)) {
 		bt_dev_dbg(hdev, "Invalid dump init pkt");
 		return;
 	}
 
-	dump_size = skb_pull_data(skb, sizeof(*dump_size));
-	if (!*dump_size) {
+	dump_size = get_unaligned_le32(skb_pull_data(skb, 4));
+	if (!dump_size) {
 		bt_dev_err(hdev, "Zero size dump init pkt");
 		return;
 	}
 
-	if (hci_devcd_prepare(hdev, *dump_size)) {
+	if (hci_devcd_prepare(hdev, dump_size)) {
 		bt_dev_err(hdev, "Failed to prepare for dump");
 		return;
 	}
@@ -441,7 +442,7 @@  int hci_devcd_init(struct hci_dev *hdev, u32 dump_size)
 		return -ENOMEM;
 
 	hci_dmp_cb(skb)->pkt_type = HCI_DEVCOREDUMP_PKT_INIT;
-	skb_put_data(skb, &dump_size, sizeof(dump_size));
+	put_unaligned_le32(dump_size, skb_put(skb, 4));
 
 	skb_queue_tail(&hdev->dump.dump_q, skb);
 	queue_work(hdev->workqueue, &hdev->dump.dump_rx);