From: Adi Suresh <adisuresh@xxxxxxxxxx>
commit db96c2cb4870173ea9b08df130f1d1cc9b5dd53d upstream.
The previous commit had a bug where the last page in the memory range
could not be synced. This change fixes the behavior so that all the
required pages are synced.
Fixes: 9cfeeb576d49 ("gve: Fixes DMA synchronization")
Signed-off-by: Adi Suresh <adisuresh@xxxxxxxxxx>
Reviewed-by: Catherine Sullivan <csully@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/google/gve/gve_tx.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/google/gve/gve_tx.c
+++ b/drivers/net/ethernet/google/gve/gve_tx.c
@@ -393,12 +393,13 @@ static void gve_tx_fill_seg_desc(union g
static void gve_dma_sync_for_device(struct device *dev, dma_addr_t *page_buses,
u64 iov_offset, u64 iov_len)
{
+ u64 last_page = (iov_offset + iov_len - 1) / PAGE_SIZE;
+ u64 first_page = iov_offset / PAGE_SIZE;
dma_addr_t dma;
- u64 addr;
+ u64 page;
- for (addr = iov_offset; addr < iov_offset + iov_len;
- addr += PAGE_SIZE) {
- dma = page_buses[addr / PAGE_SIZE];
+ for (page = first_page; page <= last_page; page++) {
+ dma = page_buses[page];
dma_sync_single_for_device(dev, dma, PAGE_SIZE, DMA_TO_DEVICE);
}
}
