From: Alamy Liu <alamy.liu@gmail.com>
Date: Mon, 25 Feb 2019 11:22:14 -0800
Subject: mmc: cqhci: Fix a tiny potential memory leak on error condition
Git-commit: d07e9fadf3a6b466ca3ae90fa4859089ff20530f
Patch-mainline: v5.0
References: git-fixes

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 <alamy.liu@gmail.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/mmc/host/cqhci.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
index bd9a59bc0e31..a8af682a9182 100644
--- a/drivers/mmc/host/cqhci.c
+++ b/drivers/mmc/host/cqhci.c
@@ -217,12 +217,21 @@ static int cqhci_host_alloc_tdl(struct cqhci_host *cq_host)
 						 cq_host->desc_size,
 						 &cq_host->desc_dma_base,
 						 GFP_KERNEL);
+	if (!cq_host->desc_base)
+		return -ENOMEM;
+
 	cq_host->trans_desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
 					      cq_host->data_size,
 					      &cq_host->trans_desc_dma_base,
 					      GFP_KERNEL);
-	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,