[PATCH] USB: don't allocate dma pools for PIO HCDs

USB: don't allocate dma pools for PIO HCDs

hcd_buffer_alloc() and hcd_buffer_free() have a similar dma_mask
check and revert to kmalloc()/kfree(), but hcd_buffer_create()
doesn't check dma_mask and allocates unused dma pools.
Signed-off-by: NChris Humbert <mahadri-kernel@drigon.com>
Acked-by: NDavid Brownell <david-b@pacbell.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/buffer.c

@@ -55,6 +55,9 @@ int hcd_buffer_create (struct usb_hcd *hcd)
 	char		name [16];
 	int 		i, size;
 
+	if (!hcd->self.controller->dma_mask)
+		return 0;
+
 	for (i = 0; i < HCD_BUFFER_POOLS; i++) { 
 		if (!(size = pool_max [i]))
 			continue;