| Message ID | 20240125-mmc-proper-kmap-v1-2-ba953c1ac3f9@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | mmc: Try to do proper kmap_local() for scatterlists | expand |
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c index 5cfdd3a86e54..7ccfe872415a 100644 --- a/drivers/mmc/host/moxart-mmc.c +++ b/drivers/mmc/host/moxart-mmc.c @@ -310,7 +310,7 @@ static void moxart_transfer_pio(struct moxart_host *host) if (host->data_len == data->bytes_xfered) return; - sgp = sg_virt(host->cur_sg); + sgp = kmap_local_page(sg_page(host->cur_sg)); remain = host->data_remain; if (data->flags & MMC_DATA_WRITE) { @@ -346,6 +346,7 @@ static void moxart_transfer_pio(struct moxart_host *host) } } + kunmap_local(sgp); data->bytes_xfered += host->data_remain - remain; host->data_remain = remain;
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@lst.de> Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@lst.de/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/mmc/host/moxart-mmc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)