mmc: cqhci: Fix a tiny potential memory leak on error condition

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>

diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
index bd9a59bc0e318da5ec3a5189036e269865acba10..a8af682a9182160e1e9074f1714dd33f5ee39cdd 100644 (file)
--- 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,