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Commit 2a22b14e authored by Pierre Ossman's avatar Pierre Ossman
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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: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 4a0ddbd2

drivers/mmc/sdhci.c

+6 −18
Original line number Diff line number Diff line
@@ -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)

drivers/mmc/sdhci.h

+0 −1
Original line number Diff line number Diff line
@@ -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 */