Re: [PATCH] Revert "usb: musb: musb_host: Enable HCD_BH flag to handle urb return in bottom half"

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On Fri, 6 Nov 2015, Bin Liu wrote:

> This reverts commit 2035772010db634ec8566b658fb1cd87ec47ac77.
> 
> Commit 20357720 claims throughput improvement for MSC/UVC, but I
> don't see much improvement. Following are the MSC measurement using
> dd on AM335x GP EVM.
> 
> with BCD_BH:    read: 14.9MB/s, write: 20.9MB/s
> without BCD_BH: read: 15.2MB/s, write: 21.2MB/s
> 
> However with this commit the following regressions have been observed.
> 
> 1. ASIX usb-ethernet dongle is completely broken on UDP RX.
> 
> 2. Unpluging a 3G modem, which uses option driver, behind a hub causes
>    console log flooding with the following message.
> 
>    option_instat_callback: error -71

Did you do any debugging to figure out why these problems occur with 
HCD_BH but don't occur without it?

Alan Stern

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