[PATCH 2/7] mmc: moxart-mmc: Map the virtual page for PIO

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


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/moxart-mmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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)
-	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;


[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux