mmc: wbsd: 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, 10 insertions, 31 deletions

diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index c1dd6ad8dab3..a44d8777ab9f 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -272,16 +272,9 @@ static inline int wbsd_next_sg(struct wbsd_host *host)
         return host->num_sg;
 }
 
-static inline char *wbsd_kmap_sg(struct wbsd_host *host)
+static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
 {
-        host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ) +
-                host->cur_sg->offset;
-        return host->mapped_sg;
-}
-
-static inline void wbsd_kunmap_sg(struct wbsd_host *host)
-{
-        kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
+        return page_address(host->cur_sg->page) + host->cur_sg->offset;
 }
 
 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
@@ -302,12 +295,11 @@ static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
          * we do not transfer too much.
          */
         for (i = 0; i < len; i++) {
-                sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+                sgbuf = page_address(sg[i].page) + sg[i].offset;
                 if (size < sg[i].length)
                         memcpy(dmabuf, sgbuf, size);
                 else
                         memcpy(dmabuf, sgbuf, sg[i].length);
-                kunmap_atomic(sgbuf, KM_BIO_SRC_IRQ);
                 dmabuf += sg[i].length;
 
                 if (size < sg[i].length)
@@ -347,7 +339,7 @@ static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
          * we do not transfer too much.
          */
         for (i = 0; i < len; i++) {
-                sgbuf = kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset;
+                sgbuf = page_address(sg[i].page) + sg[i].offset;
                 if (size < sg[i].length)
                         memcpy(sgbuf, dmabuf, size);
                 else
@@ -497,7 +489,7 @@ static void wbsd_empty_fifo(struct wbsd_host *host)
         if (data->bytes_xfered == host->size)
                 return;
 
-        buffer = wbsd_kmap_sg(host) + host->offset;
+        buffer = wbsd_sg_to_buffer(host) + host->offset;
 
         /*
          * Drain the fifo. This has a tendency to loop longer
@@ -526,17 +518,13 @@ static void wbsd_empty_fifo(struct wbsd_host *host)
                         /*
                          * Transfer done?
                          */
-                        if (data->bytes_xfered == host->size) {
-                                wbsd_kunmap_sg(host);
+                        if (data->bytes_xfered == host->size)
                                 return;
-                        }
 
                         /*
                          * End of scatter list entry?
                          */
                         if (host->remain == 0) {
-                                wbsd_kunmap_sg(host);
-
                                 /*
                                  * Get next entry. Check if last.
                                  */
@@ -554,13 +542,11 @@ static void wbsd_empty_fifo(struct wbsd_host *host)
                                         return;
                                 }
 
-                                buffer = wbsd_kmap_sg(host);
+                                buffer = wbsd_sg_to_buffer(host);
                         }
                 }
         }
 
-        wbsd_kunmap_sg(host);
-
         /*
          * This is a very dirty hack to solve a
          * hardware problem. The chip doesn't trigger
@@ -583,7 +569,7 @@ static void wbsd_fill_fifo(struct wbsd_host *host)
         if (data->bytes_xfered == host->size)
                 return;
 
-        buffer = wbsd_kmap_sg(host) + host->offset;
+        buffer = wbsd_sg_to_buffer(host) + host->offset;
 
         /*
          * Fill the fifo. This has a tendency to loop longer
@@ -612,17 +598,13 @@ static void wbsd_fill_fifo(struct wbsd_host *host)
                         /*
                          * Transfer done?
                          */
-                        if (data->bytes_xfered == host->size) {
-                                wbsd_kunmap_sg(host);
+                        if (data->bytes_xfered == host->size)
                                 return;
-                        }
 
                         /*
                          * End of scatter list entry?
                          */
                         if (host->remain == 0) {
-                                wbsd_kunmap_sg(host);
-
                                 /*
                                  * Get next entry. Check if last.
                                  */
@@ -640,13 +622,11 @@ static void wbsd_fill_fifo(struct wbsd_host *host)
                                         return;
                                 }
 
-                                buffer = wbsd_kmap_sg(host);
+                                buffer = wbsd_sg_to_buffer(host);
                         }
                 }
         }
 
-        wbsd_kunmap_sg(host);
-
         /*
          * The controller stops sending interrupts for
          * 'FIFO empty' under certain conditions. So we
diff --git a/drivers/mmc/wbsd.h b/drivers/mmc/wbsd.h
index 6072993f01e3..d06718b0e2ab 100644
--- a/drivers/mmc/wbsd.h
+++ b/drivers/mmc/wbsd.h
@@ -154,7 +154,6 @@ struct wbsd_host
 
         struct scatterlist*     cur_sg;         /* Current SG entry */
         unsigned int            num_sg;         /* Number of entries left */
-        void*                   mapped_sg;      /* vaddr of mapped sg */
 
         unsigned int            offset;         /* Offset into current entry */
         unsigned int            remain;         /* Data left in curren entry */