mmc: sdhci: plug DMA mapping leak on error
If we terminate a command early, we fail to properly clean up the DMA mappings for the data part of the request. Put this clean up to the tasklet, which is the common path for finishing a request so we always clean up after ourselves. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> [ Split original patch so that it now contains only the fix ] Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: stable@vger.kernel.org # v4.5+ Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -2207,6 +2207,22 @@ static void sdhci_tasklet_finish(unsigned long param)
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mrq = host->mrq;
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mrq = host->mrq;
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/*
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* Always unmap the data buffers if they were mapped by
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* sdhci_prepare_data() whenever we finish with a request.
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* This avoids leaking DMA mappings on error.
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*/
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if (host->flags & SDHCI_REQ_USE_DMA) {
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struct mmc_data *data = mrq->data;
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if (data && data->host_cookie == COOKIE_MAPPED) {
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dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
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(data->flags & MMC_DATA_READ) ?
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DMA_FROM_DEVICE : DMA_TO_DEVICE);
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data->host_cookie = COOKIE_UNMAPPED;
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}
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}
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/*
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/*
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* The controller needs a reset of internal state machines
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* The controller needs a reset of internal state machines
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* upon error conditions.
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* upon error conditions.
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