From: lintao <lintao@rock-chips.com>
Date: Tue, 9 Sep 2014 06:44:19 +0000 (+0800)
Subject: mmc: fix resume kpanic if no dms been allocated when init
X-Git-Tag: firefly_0821_release~4736
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8ae438b68066137d44bf35cf3784d2fe9c419cff;p=firefly-linux-kernel-4.4.55.git

mmc: fix resume kpanic if no dms been allocated when init
---

diff --git a/drivers/mmc/host/rk_sdmmc.c b/drivers/mmc/host/rk_sdmmc.c
index 8daacd47a318..4db50856b0da 100755
--- a/drivers/mmc/host/rk_sdmmc.c
+++ b/drivers/mmc/host/rk_sdmmc.c
@@ -691,6 +691,10 @@ static int dw_mci_edmac_init(struct dw_mci *host)
         return 0;
 
 err_exit:
+        if (NULL != host->dms) {
+                kfree(host->dms);
+                host->dms = NULL;
+        }
         return -ENXIO;
 
 }
@@ -699,8 +703,11 @@ static void dw_mci_edmac_exit(struct dw_mci *host)
 {
         dma_release_channel(host->dms->ch);
         host->dms->ch = NULL;
-        kfree(host->dms);
-        host->dms = NULL;
+
+        if (NULL != host->dms) {
+                kfree(host->dms);
+                host->dms = NULL;
+        }
 }
 
 static const struct dw_mci_dma_ops dw_mci_edmac_ops = {