mmc: sdhci: replace kmap with page_address

Since we actively avoid highmem, calling kmap_atomic() instead
of page_address() is effectively only obfuscation.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 6 insertions, 19 deletions

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index b57393c7f9b5..24803538570a 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -206,15 +206,9 @@ static void sdhci_deactivate_led(struct sdhci_host *host)
  *                                                                           *
 \*****************************************************************************/
 
-static inline char* sdhci_kmap_sg(struct sdhci_host* host)
+static inline char* sdhci_sg_to_buffer(struct sdhci_host* host)
 {
-        host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
-        return host->mapped_sg + host->cur_sg->offset;
-}
-
-static inline void sdhci_kunmap_sg(struct sdhci_host* host)
-{
-        kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
+        return page_address(host->cur_sg->page) + host->cur_sg->offset;
 }
 
 static inline int sdhci_next_sg(struct sdhci_host* host)
@@ -249,7 +243,7 @@ static void sdhci_read_block_pio(struct sdhci_host *host)
         chunk_remain = 0;
         data = 0;
 
-        buffer = sdhci_kmap_sg(host) + host->offset;
+        buffer = sdhci_sg_to_buffer(host) + host->offset;
 
         while (blksize) {
                 if (chunk_remain == 0) {
@@ -273,16 +267,13 @@ static void sdhci_read_block_pio(struct sdhci_host *host)
                 }
 
                 if (host->remain == 0) {
-                        sdhci_kunmap_sg(host);
                         if (sdhci_next_sg(host) == 0) {
                                 BUG_ON(blksize != 0);
                                 return;
                         }
-                        buffer = sdhci_kmap_sg(host);
+                        buffer = sdhci_sg_to_buffer(host);
                 }
         }
-
-        sdhci_kunmap_sg(host);
 }
 
 static void sdhci_write_block_pio(struct sdhci_host *host)
@@ -299,7 +290,7 @@ static void sdhci_write_block_pio(struct sdhci_host *host)
         data = 0;
 
         bytes = 0;
-        buffer = sdhci_kmap_sg(host) + host->offset;
+        buffer = sdhci_sg_to_buffer(host) + host->offset;
 
         while (blksize) {
                 size = min(host->size, host->remain);
@@ -323,16 +314,13 @@ static void sdhci_write_block_pio(struct sdhci_host *host)
                 }
 
                 if (host->remain == 0) {
-                        sdhci_kunmap_sg(host);
                         if (sdhci_next_sg(host) == 0) {
                                 BUG_ON(blksize != 0);
                                 return;
                         }
-                        buffer = sdhci_kmap_sg(host);
+                        buffer = sdhci_sg_to_buffer(host);
                 }
         }
-
-        sdhci_kunmap_sg(host);
 }
 
 static void sdhci_transfer_pio(struct sdhci_host *host)
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index bc6bf7e7757d..e324f0a623dc 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -183,7 +183,6 @@ struct sdhci_host {
         struct mmc_data         *data;          /* Current data request */
 
         struct scatterlist      *cur_sg;        /* We're working on this */
-        char                    *mapped_sg;     /* This is where it's mapped */
         int                     num_sg;         /* Entries left */
         int                     offset;         /* Offset into current sg */
         int                     remain;         /* Bytes left in current */