[alsa-devel] [PATCH] fix the kernel panic due to wrong use the dev memory API

[He, Bo]

skl->dais is allocated with devm_kcalloc, can't free with
the krealloc. Memory allocated with devm API is automatically freed
on driver detach, Like all other devres resources.

Refer to drivers/base/devres.c devm_kmalloc for more details.

Signed-off-by: he, bo <bo.he at intel.com>
---
 sound/soc/intel/skylake/skl-pcm.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c
index 823e391..928d314 100644
--- a/sound/soc/intel/skylake/skl-pcm.c
+++ b/sound/soc/intel/skylake/skl-pcm.c
@@ -1438,7 +1438,8 @@ int skl_platform_register(struct device *dev)
 	}
 
 	if (!skl->use_tplg_pcm) {
-		dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
+		devm_kfree(dev, skl->dais);
+		dais = devm_kcalloc(dev, skl->dais, sizeof(skl_fe_dai) +
 				sizeof(skl_platform_dai), GFP_KERNEL);
 		if (!dais) {
 			ret = -ENOMEM;
@@ -1472,7 +1473,5 @@ int skl_platform_unregister(struct device *dev)
 		}
 	}
 
-	kfree(skl->dais);
-
 	return 0;
 }
-- 
2.7.4