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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: Pierre Ossman <drzeus@drzeus.cx>
hifive-unleashed-5.1
Pierre Ossman 2007-02-02 18:27:42 +01:00
parent 4a0ddbd25a
commit 2a22b14edf
2 changed files with 6 additions and 19 deletions
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24
drivers/mmc/sdhci.c
View File

@ -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)

1
drivers/mmc/sdhci.h
View File

@ -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 */