mmc: core: Convert mmc_align_data_size() into an SDIO specific function

The only user of mmc_align_data_size() is sdio_align_size(), which is
called from SDIO func drivers to let them distinguish, how to optimally
allocate data buffers.

Let's move mmc_align_data_size() close to the SDIO code as to make it
static, rename it to _sdio_align_size() and simplify its definition, all
with the purpose of clarifying that this is SDIO specific.

Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Avri Altman <[email protected]>

Author: storulf

drivers/mmc/core/core.c

@@ -757,33 +757,6 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 }
 EXPORT_SYMBOL(mmc_set_data_timeout);
 
-/**
- *	mmc_align_data_size - pads a transfer size to a more optimal value
- *	@card: the MMC card associated with the data transfer
- *	@sz: original transfer size
- *
- *	Pads the original data size with a number of extra bytes in
- *	order to avoid controller bugs and/or performance hits
- *	(e.g. some controllers revert to PIO for certain sizes).
- *
- *	Returns the improved size, which might be unmodified.
- *
- *	Note that this function is only relevant when issuing a
- *	single scatter gather entry.
- */
-unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
-{
-	/*
-	 * FIXME: We don't have a system for the controller to tell
-	 * the core about its problems yet, so for now we just 32-bit
-	 * align the size.
-	 */
-	sz = ((sz + 3) / 4) * 4;
-
-	return sz;
-}
-EXPORT_SYMBOL(mmc_align_data_size);
-
 /*
  * Allow claiming an already claimed host if the context is the same or there is
  * no context but the task is the same.

drivers/mmc/core/sdio_io.c

@@ -10,6 +10,7 @@
  */
 
 #include <linux/export.h>
+#include <linux/kernel.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/sdio.h>
@@ -203,6 +204,21 @@ static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
 	return min(mval, 512u); /* maximum size for byte mode */
 }
 
+/*
+ * This is legacy code, which needs to be re-worked some day. Basically we need
+ * to take into account the properties of the host, as to enable the SDIO func
+ * driver layer to allocate optimal buffers.
+ */
+static inline unsigned int _sdio_align_size(unsigned int sz)
+{
+	/*
+	 * FIXME: We don't have a system for the controller to tell
+	 * the core about its problems yet, so for now we just 32-bit
+	 * align the size.
+	 */
+	return ALIGN(sz, 4);
+}
+
 /**
  *	sdio_align_size - pads a transfer size to a more optimal value
  *	@func: SDIO function
@@ -230,7 +246,7 @@ unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
 	 * wants to increase the size up to a point where it
 	 * might need more than one block.
 	 */
-	sz = mmc_align_data_size(func->card, sz);
+	sz = _sdio_align_size(sz);
 
 	/*
 	 * If we can still do this with just a byte transfer, then
@@ -252,7 +268,7 @@ unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
 		 */
 		blk_sz = ((sz + func->cur_blksize - 1) /
 			func->cur_blksize) * func->cur_blksize;
-		blk_sz = mmc_align_data_size(func->card, blk_sz);
+		blk_sz = _sdio_align_size(blk_sz);
 
 		/*
 		 * This value is only good if it is still just
@@ -265,8 +281,7 @@ unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
 		 * We failed to do one request, but at least try to
 		 * pad the remainder properly.
 		 */
-		byte_sz = mmc_align_data_size(func->card,
-				sz % func->cur_blksize);
+		byte_sz = _sdio_align_size(sz % func->cur_blksize);
 		if (byte_sz <= sdio_max_byte_size(func)) {
 			blk_sz = sz / func->cur_blksize;
 			return blk_sz * func->cur_blksize + byte_sz;
@@ -276,16 +291,14 @@ unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
 		 * We need multiple requests, so first check that the
 		 * controller can handle the chunk size;
 		 */
-		chunk_sz = mmc_align_data_size(func->card,
-				sdio_max_byte_size(func));
+		chunk_sz = _sdio_align_size(sdio_max_byte_size(func));
 		if (chunk_sz == sdio_max_byte_size(func)) {
 			/*
 			 * Fix up the size of the remainder (if any)
 			 */
 			byte_sz = orig_sz % chunk_sz;
 			if (byte_sz) {
-				byte_sz = mmc_align_data_size(func->card,
-						byte_sz);
+				byte_sz = _sdio_align_size(byte_sz);
 			}
 
 			return (orig_sz / chunk_sz) * chunk_sz + byte_sz;

drivers/mmc/core/sdio_ops.h

@@ -25,7 +25,6 @@ int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 	unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz);
 int sdio_reset(struct mmc_host *host);
-unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz);
 void sdio_irq_work(struct work_struct *work);
 
 static inline bool sdio_is_io_busy(u32 opcode, u32 arg)