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Date: Sat, 31 May 2014 18:22:39 +0100 From: Kieran Kunhya <kieran618@...glemail.com> To: linux-kernel@...r.kernel.org Subject: Block device questions Hello, I'm writing a driver for Sony SxS cards, which is an Expresscard based flash memory card used in Sony cameras with an eventual goal of submitting the code to mainline. The code in its current working but ugly state can be found here: https://github.com/kierank/sxs-linux/blob/master/sxs.c I had some questions about the block device layer: As far as I can tell from reverse engineering the device, it doesn't support full scatter/gather but can do multiple block reads to one address of DMA memory of a suitable size. Is there a way of coalescing adjacent segments and letting the device write to one large slab of DMA memory? Or do I have to handle each segment individually? Also how many minor numbers am I meant to allocate with alloc_disk()? Regards, Kieran Kunhya -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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