sdhci: add warnings for bad buffers in ADMA path
The ADMA code path assumes that the 3 byte alignment fix doesn't cross a page boundary. I'm not convinced this is worth supporting, but at least print a warning in the off chance we'll actually see such a request. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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@ -389,6 +389,7 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
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if (offset) {
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if (data->flags & MMC_DATA_WRITE) {
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buffer = sdhci_kmap_atomic(sg, &flags);
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WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
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memcpy(align, buffer, offset);
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sdhci_kunmap_atomic(buffer, &flags);
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}
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@ -510,6 +511,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
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size = 4 - (sg_dma_address(sg) & 0x3);
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buffer = sdhci_kmap_atomic(sg, &flags);
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WARN_ON(((long)buffer & PAGE_MASK) > (PAGE_SIZE - 3));
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memcpy(buffer, align, size);
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sdhci_kunmap_atomic(buffer, &flags);
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