From a6720c023af24220f3f26459c0aa156260a84aa0 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 28 May 2018 08:14:21 +0200 Subject: [PATCH] mmc: au1xmmc: handle highmem pages Use kmap_atomic to map the scatterlist entry before using it. Signed-off-by: Christoph Hellwig Signed-off-by: Ulf Hansson --- drivers/mmc/host/au1xmmc.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c index ed77fbfa..9b4be67 100644 --- a/drivers/mmc/host/au1xmmc.c +++ b/drivers/mmc/host/au1xmmc.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include #include @@ -405,7 +406,7 @@ 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 = sg_virt(sg) + host->pio.offset; + sg_ptr = kmap_atomic(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; @@ -421,11 +422,12 @@ static void au1xmmc_send_pio(struct au1xmmc_host *host) if (!(status & SD_STATUS_TH)) break; - val = *sg_ptr++; + val = sg_ptr[count]; __raw_writel((unsigned long)val, HOST_TXPORT(host)); wmb(); /* drain writebuffer */ } + kunmap_atomic(sg_ptr); host->pio.len -= count; host->pio.offset += count; @@ -462,7 +464,7 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host) if (host->pio.index < host->dma.len) { sg = &data->sg[host->pio.index]; - sg_ptr = sg_virt(sg) + host->pio.offset; + sg_ptr = kmap_atomic(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; @@ -501,8 +503,10 @@ static void au1xmmc_receive_pio(struct au1xmmc_host *host) val = __raw_readl(HOST_RXPORT(host)); if (sg_ptr) - *sg_ptr++ = (unsigned char)(val & 0xFF); + sg_ptr[count] = (unsigned char)(val & 0xFF); } + if (sg_ptr) + kunmap_atomic(sg_ptr); host->pio.len -= count; host->pio.offset += count; -- 2.7.4