Hi Alan,
Alan Stern wrote:
> Greg:
>
> Rather than using a home-brewed test (dev->dma_mask != NULL) to
> indicate which host controller devices use DMA, this patch (as770)
> invokes the standard dma_supported() API and caches the result.
>
[snip]
> Index: usb-2.6/include/linux/usb.h
> ===================================================================
> --- usb-2.6.orig/include/linux/usb.h
> +++ usb-2.6/include/linux/usb.h
> @@ -270,6 +270,7 @@ struct usb_bus {
> struct device *controller; /* host/master side hardware */
> int busnum; /* Bus number (in order of reg) */
> char *bus_name; /* stable id (PCI slot_name etc) */
> + u8 uses_dma; /* Does the host controller use DMA? */
Why using 'u8' (which is likely expanded to an int) ? Can we use a bit field
instead as defined below ?
> unsigned is_b_host:1; /* true during some HNP roleswitches */
> unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
>
Franck
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