mmc: sdhci: fix dma memory leak in sdhci_pre_req()

Currently one mrq->data maybe execute dma_map_sg() twice
when mmc subsystem prepare over one new request, and the
following log show up:
	sdhci[sdhci_pre_dma_transfer] invalid cookie: 24, next-cookie 25

In this condition, mrq->date map a dma-memory(1) in sdhci_pre_req
for the first time, and map another dma-memory(2) in sdhci_prepare_data
for the second time. But driver only unmap the dma-memory(2), and
dma-memory(1) never unmapped, which cause the dma memory leak issue.

This patch use another method to map the dma memory for the mrq->data
which can fix this dma memory leak issue.

Fixes: 348487cb28 ("mmc: sdhci: use pipeline mmc requests to improve performance")
Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.h

@@ -309,9 +309,10 @@ struct sdhci_adma2_64_desc {
  */
 #define SDHCI_MAX_SEGS		128
 
-struct sdhci_host_next {
-	unsigned int	sg_count;
-	s32		cookie;
+enum sdhci_cookie {
+	COOKIE_UNMAPPED,
+	COOKIE_MAPPED,
+	COOKIE_GIVEN,
 };
 
 struct sdhci_host {
@@ -505,7 +506,6 @@ struct sdhci_host {
 	unsigned int		tuning_mode;	/* Re-tuning mode supported by host */
 #define SDHCI_TUNING_MODE_1	0
 
-	struct sdhci_host_next	next_data;
 	unsigned long private[0] ____cacheline_aligned;
 };