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47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
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From 51487e55ceabd24572bdd12ed7fd45e20676f399 Mon Sep 17 00:00:00 2001
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From: Yaroslav Rosomakho <yaroslavros@gmail.com>
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Date: Fri, 23 Aug 2019 11:05:51 +0200
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Subject: [PATCH 1/2] Add missing dma_unmap_sg calls to free relevant swiotlb
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bounce buffers. This prevents DMA leaks.
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Signed-off-by: Yaroslav Rosomakho <yaroslavros@gmail.com>
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---
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drivers/mmc/host/bcm2835-mmc.c | 15 +++++++++------
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1 file changed, 9 insertions(+), 6 deletions(-)
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--- a/drivers/mmc/host/bcm2835-mmc.c
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+++ b/drivers/mmc/host/bcm2835-mmc.c
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@@ -344,16 +344,17 @@ static void bcm2835_mmc_dma_complete(voi
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host->use_dma = false;
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- if (host->data && !(host->data->flags & MMC_DATA_WRITE)) {
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- /* otherwise handled in SDHCI IRQ */
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+ if (host->data) {
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dma_chan = host->dma_chan_rxtx;
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- dir_data = DMA_FROM_DEVICE;
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-
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+ if (host->data->flags & MMC_DATA_WRITE)
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+ dir_data = DMA_TO_DEVICE;
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+ else
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+ dir_data = DMA_FROM_DEVICE;
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dma_unmap_sg(dma_chan->device->dev,
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host->data->sg, host->data->sg_len,
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dir_data);
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-
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- bcm2835_mmc_finish_data(host);
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+ if (! (host->data->flags & MMC_DATA_WRITE))
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+ bcm2835_mmc_finish_data(host);
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} else if (host->wait_for_dma) {
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host->wait_for_dma = false;
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tasklet_schedule(&host->finish_tasklet);
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@@ -539,6 +540,8 @@ static void bcm2835_mmc_transfer_dma(str
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spin_unlock_irqrestore(&host->lock, flags);
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dmaengine_submit(desc);
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dma_async_issue_pending(dma_chan);
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+ } else {
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+ dma_unmap_sg(dma_chan->device->dev, host->data->sg, len, dir_data);
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}
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}
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