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authorRanjani Sridharan <ranjani.sridharan@linux.intel.com>2019-04-05 09:57:09 -0700
committerMark Brown <broonie@kernel.org>2019-04-08 14:15:53 +0700
commit52034add758e268c39110f33d46e2a9492e82aef (patch)
tree406c5b8b435fb5c04ed39cb8560004e3516b1099 /sound
parentb4ed6b51f356224c6c71540ed94087f7f09b84af (diff)
ASoC: pcm: update module refcount if module_get_upon_open is set
Setting the module_get_upon_open field for component driver prevents the module refcount from being incremented during component probe(). This could lead to the module being allowed to be unloaded when a pcm stream is open. So, if this field is set, the module's refcount should be incremented during pcm open to prevent module removal when the component is in use. And, the refcount should be decremented upon pcm close. Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/soc-pcm.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 2d5d5cac4ba6..d21247546f7f 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -15,6 +15,7 @@
#include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
+#include <linux/module.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/export.h>
@@ -463,6 +464,9 @@ static int soc_pcm_components_close(struct snd_pcm_substream *substream,
continue;
component->driver->ops->close(substream);
+
+ if (component->driver->module_get_upon_open)
+ module_put(component->dev->driver->owner);
}
return 0;
@@ -513,6 +517,10 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
!component->driver->ops->open)
continue;
+ if (component->driver->module_get_upon_open &&
+ !try_module_get(component->dev->driver->owner))
+ return -ENODEV;
+
ret = component->driver->ops->open(substream);
if (ret < 0) {
dev_err(component->dev,