Matthieu CASTET a écrit : > Hi, > > Patra, Nilkesh a écrit : >> On the latest version of MUSB, DMA is not working properly if the Data in the packet doesn't start at 32bit aligned address. This issue was found while using MUSB as g_ether. The basic ping does not work, if the data in the Ethernet packet does not start at 32bit aligned address. >> >> To overcome this issue, we found one solution mentioned in the below patch. This patch moves data (skb->data) by 2 bytes backwards in ethernet packet, which is nothing but skb->head. >> >> I want to know, if there are any better approaches to fix this issue. >> > What dma_mask are you using ? > >>From what I understand, dma_map_single will use it to know if the dma > buffer need to be aligned [1]. > So you need to set the last 2 bits to 0 and it should do everything for you. > Forget what I said it is only true in CONFIG_DMABOUNCE case... -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
