Re: [PATCH 1/3] mfd: Add realtek USB card reader driver

From: Roger
Date: Mon Jan 20 2014 - 03:55:35 EST

On 01/16/2014 05:35 PM, Lee Jones wrote:
+static int rtsx_usb_bulk_transfer_sglist(struct rtsx_ucr *ucr,
+ unsigned int pipe, struct scatterlist *sg, int num_sg,
+ unsigned int length, unsigned int *act_len, int timeout)
+ int ret;
+ dev_dbg(&ucr->pusb_intf->dev, "%s: xfer %u bytes, %d entries\n",
+ __func__, length, num_sg);
+ ret = usb_sg_init(&ucr->current_sg, ucr->pusb_dev, pipe, 0,
+ sg, num_sg, length, GFP_NOIO);
+ if (ret)
+ return ret;
+ ucr->sg_timer.expires = jiffies + msecs_to_jiffies(timeout);
+ add_timer(&ucr->sg_timer);
+ usb_sg_wait(&ucr->current_sg);
+ del_timer(&ucr->sg_timer);
+ if (act_len)
+ *act_len = ucr->current_sg.bytes;
+ return ucr->current_sg.status;

Code looks fine, but shouldn't this live in a USB driver?

We have studied drivers in usb/storage, the place that most likely
to put the driver. All of them are for STANDARD usb mass storage
class(something like USB_CLASS_MASS_STORAGE). But this is not the
same case. This driver is for our vendor-class device with
completely different protocol. It is really an USB interfaced flash
card command converter(or channel) device rather than a real
storage. It also has two derived modules(rtsx_usb_sdmmc,
rtsx_usb_memstick) for other two subsystems.

We also have another driver: rtsx_pcr.c resident in mfd/ for similar
devices but of PCIe interface. It is nature for us to choose the
same place for this variant.

Very well, as long as it truly does not fit in drivers/usb. It would
be good to have one of the USB folk give the nod though.

I found Greg K-H is exactly one of the maintainers of USB subsystem as I read the MAINTAINERS document.

Greg, would you please comment this subsystem concern or introduce other members? Thanks.
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