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Date:   Mon,  4 Mar 2019 09:22:56 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Alamy Liu <>,
        Adrian Hunter <>,
        Ulf Hansson <>
Subject: [PATCH 4.20 73/88] mmc: cqhci: Fix a tiny potential memory leak on error condition

4.20-stable review patch.  If anyone has any objections, please let me know.


From: Alamy Liu <>

commit d07e9fadf3a6b466ca3ae90fa4859089ff20530f upstream.

Free up the allocated memory in the case of error return

The value of mmc_host->cqe_enabled stays 'false'. Thus, cqhci_disable
(mmc_cqe_ops->cqe_disable) won't be called to free the memory.  Also,
cqhci_disable() seems to be designed to disable and free all resources, not
suitable to handle this corner case.

Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
Signed-off-by: Alamy Liu <>
Acked-by: Adrian Hunter <>
Signed-off-by: Ulf Hansson <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/mmc/host/cqhci.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/mmc/host/cqhci.c
+++ b/drivers/mmc/host/cqhci.c
@@ -217,12 +217,21 @@ static int cqhci_host_alloc_tdl(struct c
+	if (!cq_host->desc_base)
+		return -ENOMEM;
 	cq_host->trans_desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
-	if (!cq_host->desc_base || !cq_host->trans_desc_base)
+	if (!cq_host->trans_desc_base) {
+		dmam_free_coherent(mmc_dev(cq_host->mmc), cq_host->desc_size,
+				   cq_host->desc_base,
+				   cq_host->desc_dma_base);
+		cq_host->desc_base = NULL;
+		cq_host->desc_dma_base = 0;
 		return -ENOMEM;
+	}
 	pr_debug("%s: cqhci: desc-base: 0x%p trans-base: 0x%p\n desc_dma 0x%llx trans_dma: 0x%llx\n",
 		 mmc_hostname(cq_host->mmc), cq_host->desc_base, cq_host->trans_desc_base,

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