[PATCH 3/7] mmc: mvsdio: 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/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 {


[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