From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jaehoon Chung <jh80.chung@samsung.com>
Subject: [RFC] dw_mmc: didn't support multiple blocks of weird length?
Date: Fri, 25 Feb 2011 16:35:00 +0900
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To: "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>
Cc: will.newton@imgtec.com, Kyungmin Park <kyungmin.park@samsung.com>, Chris Ball <cjb@laptop.org>

Hi..

I didn't understand this point..
Plz let me explain this code..
why need this function (dw_mci_queue_request(host, slot, mrq)?


static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
				 struct mmc_request *mrq)
{
	dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
		 host->state);

	spin_lock_bh(&host->lock);
	slot->mrq = mrq;

	if (host->state == STATE_IDLE) {
		host->state = STATE_SENDING_CMD;
		dw_mci_start_request(host, slot);
	} else {
		list_add_tail(&slot->queue_node, &host->queue);
	}

	spin_unlock_bh(&host->lock);
}

static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct dw_mci_slot *slot = mmc_priv(mmc);
	struct dw_mci *host = slot->host;

	WARN_ON(slot->mrq);

	if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
		mrq->cmd->error = -ENOMEDIUM;
		mmc_request_done(mmc, mrq);
		return;
	}

	/* We don't support multiple blocks of weird lengths. */
	dw_mci_queue_request(host, slot, mrq);
}