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From f8554985b77df2dac55f2d7c85e0f0cc3497a1fd Mon Sep 17 00:00:00 2001
From: Yaroslav Rosomakho <yaroslavros@gmail.com>
Date: Fri, 23 Aug 2019 11:05:51 +0200
Subject: [PATCH] Add missing dma_unmap_sg calls to free relevant
swiotlb bounce buffers. This prevents DMA leaks.
Signed-off-by: Yaroslav Rosomakho <yaroslavros@gmail.com>
---
drivers/mmc/host/bcm2835-mmc.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/mmc/host/bcm2835-mmc.c
+++ b/drivers/mmc/host/bcm2835-mmc.c
@@ -345,16 +345,17 @@ static void bcm2835_mmc_dma_complete(voi
host->use_dma = false;
- if (host->data && !(host->data->flags & MMC_DATA_WRITE)) {
- /* otherwise handled in SDHCI IRQ */
+ if (host->data) {
dma_chan = host->dma_chan_rxtx;
- dir_data = DMA_FROM_DEVICE;
-
+ if (host->data->flags & MMC_DATA_WRITE)
+ dir_data = DMA_TO_DEVICE;
+ else
+ dir_data = DMA_FROM_DEVICE;
dma_unmap_sg(dma_chan->device->dev,
host->data->sg, host->data->sg_len,
dir_data);
-
- bcm2835_mmc_finish_data(host);
+ if (! (host->data->flags & MMC_DATA_WRITE))
+ bcm2835_mmc_finish_data(host);
} else if (host->wait_for_dma) {
host->wait_for_dma = false;
tasklet_schedule(&host->finish_tasklet);
@@ -540,6 +541,8 @@ static void bcm2835_mmc_transfer_dma(str
spin_unlock_irqrestore(&host->lock, flags);
dmaengine_submit(desc);
dma_async_issue_pending(dma_chan);
+ } else {
+ dma_unmap_sg(dma_chan->device->dev, host->data->sg, len, dir_data);
}
}
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