Re: [PATCH] Revert "serial: 8250_dma: don't bother DMA with small transfers"

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Hi Andy,

>>>> It's customary to mail the commit author in patches which revert
>>>> their work.
>>>> 
>>>>> This commit prevents from sending "big" file using Bluetooth.
>>>>> When sending a lot of data quickly through the Bluetooth 
>>>>> interface, 
>>>>> and
>>>>> after a variable amount of data sent, transfer fails with 
>>>>> error:
>>>>>    kernel: [  415.247453] Bluetooth: hci0 hardware error 0x00
> 
> Frederic, I forgot to ask how exactly the hw setup looks like?
> 
> The message above is not present in the kernel (the closest what I
> found is 
> 
> drivers/bluetooth/btintel.c:98: BT_ERR("%s: Hardware error 0x%2.2x",
> hdev->name, code);
> 
> which makes me think you have USB BT adapter attached to the same
> machine. Am I wrong?

the Bluetooth core will generate that error in case the driver does not provide hdev->hw_error callback. We have not hocked that up for the UART driver yet. Look at net/bluetooth/hci_core.c to find the common error message.

Regards

Marcel

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