[alsa-devel] [PATCH v2] ALSA: compress: add support for 32bit calls in a 64bit kernel
Ravindra Lokhande
rlokhande at nvidia.com
Fri Dec 4 14:32:33 CET 2015
Compress offload does not support ioctl calls from a 32bit userspace
in a 64 bit kernel. This patch adds support for ioctls from a 32bit
userspace in a 64bit kernel
Signed-off-by: Ravindra Lokhande <rlokhande at nvidia.com>
---
v1 -> v2: use compat_ptr to convert 32 bit address to 64 bit pointer
sound/core/compress_offload.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index b123c42..4c156a7 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -847,6 +847,15 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
return retval;
}
+/* support of 32bit userspace on 64bit platforms */
+#ifdef CONFIG_COMPAT
+static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
static const struct file_operations snd_compr_file_ops = {
.owner = THIS_MODULE,
.open = snd_compr_open,
@@ -854,6 +863,9 @@ static const struct file_operations snd_compr_file_ops = {
.write = snd_compr_write,
.read = snd_compr_read,
.unlocked_ioctl = snd_compr_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = snd_compr_ioctl_compat,
+#endif
.mmap = snd_compr_mmap,
.poll = snd_compr_poll,
};
--
2.1.4
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