Use kmap_local_page() instead of sg_virt() to obtain a page from the scatterlist: sg_virt() will not perform bounce buffering if the page happens to be located in high memory, which the driver may or may not be using. Suggested-by: Christoph Hellwig <hch@xxxxxx> Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@xxxxxx/ Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> --- drivers/mmc/host/mvsdio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c index ca01b7d204ba..a004a523bd2a 100644 --- a/drivers/mmc/host/mvsdio.c +++ b/drivers/mmc/host/mvsdio.c @@ -115,7 +115,7 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data) * boundary. */ host->pio_size = data->blocks * data->blksz; - host->pio_ptr = sg_virt(data->sg); + host->pio_ptr = kmap_local_page(sg_page(data->sg)); if (!nodma) dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n", host->pio_ptr, host->pio_size); @@ -289,6 +289,7 @@ static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data, void __iomem *iobase = host->base; if (host->pio_ptr) { + kunmap_local(host->pio_ptr); host->pio_ptr = NULL; host->pio_size = 0; } else { -- 2.34.1
