mmc: au1xmmc: handle highmem pages

Use kmap_atomic to map the scatterlist entry before using it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index ed77fbfa477404c477407f60567d2b19197e0805..9b4be67330dd2fa5cefb0cf139b77f989c2f0383 100644 (file)
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -40,6 +40,7 @@
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
 #include <linux/scatterlist.h>
+#include <linux/highmem.h>
 #include <linux/leds.h>
 #include <linux/mmc/host.h>
 #include <linux/slab.h>
@@ -405,7 +406,7 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host)
 
        /* This is the pointer to the data buffer */
        sg = &data->sg[host->pio.index];
-       sg_ptr = sg_virt(sg) + host->pio.offset;
+       sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset;
 
        /* This is the space left inside the buffer */
        sg_len = data->sg[host->pio.index].length - host->pio.offset;
@@ -421,11 +422,12 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host)
                if (!(status & SD_STATUS_TH))
                        break;
 
-               val = *sg_ptr++;
+               val = sg_ptr[count];
 
                __raw_writel((unsigned long)val, HOST_TXPORT(host));
                wmb(); /* drain writebuffer */
        }
+       kunmap_atomic(sg_ptr);
 
        host->pio.len -= count;
        host->pio.offset += count;
@@ -462,7 +464,7 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host)
 
        if (host->pio.index < host->dma.len) {
                sg = &data->sg[host->pio.index];
-               sg_ptr = sg_virt(sg) + host->pio.offset;
+               sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset;
 
                /* This is the space left inside the buffer */
                sg_len = sg_dma_len(&data->sg[host->pio.index]) - host->pio.offset;
@@ -501,8 +503,10 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host)
                val = __raw_readl(HOST_RXPORT(host));
 
                if (sg_ptr)
-                       *sg_ptr++ = (unsigned char)(val & 0xFF);
+                       sg_ptr[count] = (unsigned char)(val & 0xFF);
        }
+       if (sg_ptr)
+               kunmap_atomic(sg_ptr);
 
        host->pio.len -= count;
        host->pio.offset += count;