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

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.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/au1xmmc.c

@@ -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;