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mmc: au1xmmc: Replace kmap_atomic() with kmap_local_page()

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kmap_local_page() is equivalent to kmap_atomic() except that it does not
disable page faults or preemption. Where possible kmap_local_page() is
preferred to kmap_atomic() - refer kernel highmem documentation.

In this case, there is no need to disable page faults or preemption, so
replace kmap_atomic() with kmap_local_page(), and, correspondingly,
kunmap_atomic() with kunmap_local().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20221005101951.3165-14-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2022-10-05 13:19:50 +03:00 committed by Ulf Hansson
parent 8e8d695fa5
commit 2fc458f75e
1 changed files with 4 additions and 4 deletions
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8
drivers/mmc/host/au1xmmc.c
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@ -388,7 +388,7 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host)
/* This is the pointer to the data buffer */
sg = &data->sg[host->pio.index];
sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset;
sg_ptr = kmap_local_page(sg_page(sg)) + sg->offset + host->pio.offset;
/* This is the space left inside the buffer */
sg_len = data->sg[host->pio.index].length - host->pio.offset;
@ -409,7 +409,7 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host)
__raw_writel((unsigned long)val, HOST_TXPORT(host));
wmb(); /* drain writebuffer */
}
kunmap_atomic(sg_ptr);
kunmap_local(sg_ptr);
host->pio.len -= count;
host->pio.offset += count;
@ -446,7 +446,7 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host)
if (host->pio.index < host->dma.len) {
sg = &data->sg[host->pio.index];
sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset;
sg_ptr = kmap_local_page(sg_page(sg)) + sg->offset + host->pio.offset;
/* This is the space left inside the buffer */
sg_len = sg_dma_len(&data->sg[host->pio.index]) - host->pio.offset;
@ -488,7 +488,7 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host)
sg_ptr[count] = (unsigned char)(val & 0xFF);
}
if (sg_ptr)
kunmap_atomic(sg_ptr);
kunmap_local(sg_ptr);
host->pio.len -= count;
host->pio.offset += count;