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mmc: sdhci check parameters before call dma_free_coherent

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We should not call dma_free_coherent if host->adma_table is NULL,
otherwise may trigger panic.

Fixes: d1e49f77d7 ("mmc: sdhci: convert ADMA descriptors to a...")
Signed-off-by: Peng Fan <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
This commit is contained in:
Peng Fan 2015-06-22 11:41:23 +08:00 • committed by Ulf Hansson
commit 7ac020366b
1 changed files with 5 additions and 2 deletions
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7
drivers/mmc/host/sdhci.c
View file

@ -2978,8 +2978,11 @@ int sdhci_add_host(struct sdhci_host *host)
GFP_KERNEL);
host->align_buffer = kmalloc(host->align_buffer_sz, GFP_KERNEL);
if (!host->adma_table || !host->align_buffer) {
dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
host->adma_table, host->adma_addr);
if (host->adma_table)
dma_free_coherent(mmc_dev(mmc),
host->adma_table_sz,
host->adma_table,
host->adma_addr);
kfree(host->align_buffer);
pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
mmc_hostname(mmc));