mmc: fix the use of kunmap_atomic() in tmio_mmc.h

kunmap_atomic() takes the cookie, returned by the kmap_atomic() as its
argument and not the page address, used as an argument to kmap_atomic().
This patch fixes the compile error:

In file included from drivers/mmc/host/tmio_mmc.c:37:
drivers/mmc/host/tmio_mmc.h: In function 'tmio_mmc_kunmap_atomic':
drivers/mmc/host/tmio_mmc.h:192: error: negative width in bit-field '<anonymous>'

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Tested-by: Magnus Damm <damm@opensource.se>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/tmio_mmc.c

@@ -164,6 +164,7 @@ tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 {
 	struct mmc_data *data = host->data;
+	void *sg_virt;
 	unsigned short *buf;
 	unsigned int count;
 	unsigned long flags;
@@ -173,8 +174,8 @@ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 		return;
 	}
 
-	buf = (unsigned short *)(tmio_mmc_kmap_atomic(host, &flags) +
-	      host->sg_off);
+	sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
+	buf = (unsigned short *)(sg_virt + host->sg_off);
 
 	count = host->sg_ptr->length - host->sg_off;
 	if (count > data->blksz)
@@ -191,7 +192,7 @@ static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 
 	host->sg_off += count;
 
-	tmio_mmc_kunmap_atomic(host, &flags);
+	tmio_mmc_kunmap_atomic(sg_virt, &flags);
 
 	if (host->sg_off == host->sg_ptr->length)
 		tmio_mmc_next_sg(host);

drivers/mmc/host/tmio_mmc.h

@@ -174,19 +174,17 @@ static inline int tmio_mmc_next_sg(struct tmio_mmc_host *host)
 	return --host->sg_len;
 }
 
-static inline char *tmio_mmc_kmap_atomic(struct tmio_mmc_host *host,
+static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
 	unsigned long *flags)
 {
-	struct scatterlist *sg = host->sg_ptr;
-
 	local_irq_save(*flags);
 	return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
 }
 
-static inline void tmio_mmc_kunmap_atomic(struct tmio_mmc_host *host,
+static inline void tmio_mmc_kunmap_atomic(void *virt,
 	unsigned long *flags)
 {
-	kunmap_atomic(sg_page(host->sg_ptr), KM_BIO_SRC_IRQ);
+	kunmap_atomic(virt, KM_BIO_SRC_IRQ);
 	local_irq_restore(*flags);
 }