[PATCH V2] bluetooth: btusb: Fix issue with suspend

[PATCH V2] bluetooth: btusb: Fix issue with suspend

[Larry Finger]

From: Champion Chen <champion_chen@realsil.com.cn>

Suspend could fail for some platforms because
btusb_suspend==> btusb_stop_traffic ==> usb_kill_anchored_urbs,

When btusb_bulk_complete returns before system suspend and resubmits an urb,
the system cannot enter suspend state.

Signed-off-by: Champion Chen <champion_chen@realsil.com.cn>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
---
V2 - Fix incorrect test as noted by Marcel.

---
Johan,

To help Champion with the process, I have formatted the patch in
the correct manner. I hope I understand the issue correctly and
stated it in a coherent manner in the commit message.

Larry
---
 drivers/bluetooth/btusb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Index: linux-2.6/drivers/bluetooth/btusb.c
===================================================================
--- linux-2.6.orig/drivers/bluetooth/btusb.c
+++ linux-2.6/drivers/bluetooth/btusb.c
@@ -330,6 +330,9 @@ static void btusb_intr_complete(struct u
 			BT_ERR("%s corrupted event packet", hdev->name);
 			hdev->stat.err_rx++;
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}
 
 	if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
@@ -418,6 +421,9 @@ static void btusb_bulk_complete(struct u
 			BT_ERR("%s corrupted ACL packet", hdev->name);
 			hdev->stat.err_rx++;
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}
 
 	if (!test_bit(BTUSB_BULK_RUNNING, &data->flags))
@@ -512,6 +518,9 @@ static void btusb_isoc_complete(struct u
 				hdev->stat.err_rx++;
 			}
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}
 
 	if (!test_bit(BTUSB_ISOC_RUNNING, &data->flags))

Re: [PATCH V2] bluetooth: btusb: Fix issue with suspend

[Marcel Holtmann]

Hi Larry,

> Suspend could fail for some platforms because
> btusb_suspend==> btusb_stop_traffic ==> usb_kill_anchored_urbs,
> 
> When btusb_bulk_complete returns before system suspend and resubmits an urb,
> the system cannot enter suspend state.
> 
> Signed-off-by: Champion Chen <champion_chen@realsil.com.cn>
> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
> ---
> V2 - Fix incorrect test as noted by Marcel.
> 
> ---
> Johan,
> 
> To help Champion with the process, I have formatted the patch in
> the correct manner. I hope I understand the issue correctly and
> stated it in a coherent manner in the commit message.
> 
> Larry
> ---
> drivers/bluetooth/btusb.c | 9 +++++++++
> 1 file changed, 9 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel

Re: [PATCH V2] bluetooth: btusb: Fix issue with suspend

[Larry Finger]

On 09/08/2014 08:25 PM, Marcel Holtmann wrote:
> Hi Larry,
>
>> Suspend could fail for some platforms because
>> btusb_suspend==> btusb_stop_traffic ==> usb_kill_anchored_urbs,
>>
>> When btusb_bulk_complete returns before system suspend and resubmits an urb,
>> the system cannot enter suspend state.
>>
>> Signed-off-by: Champion Chen <champion_chen@realsil.com.cn>
>> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
>> ---
>> V2 - Fix incorrect test as noted by Marcel.
>>
>> ---
>> Johan,
>>
>> To help Champion with the process, I have formatted the patch in
>> the correct manner. I hope I understand the issue correctly and
>> stated it in a coherent manner in the commit message.
>>
>> Larry
>> ---
>> drivers/bluetooth/btusb.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>
> patch has been applied to bluetooth-next tree.

Thanks,

Larry