Add the top level compat ioctl handler as a placeholder
for adding additional handlers.
The ioctls are first filtered and forwarded to the
regular ioctl handler if the ioctl does not require
any extra compatibility processing.
Signed-off-by: Michael Zoran <mzo...@crowfest.net>
---
.../vc04_services/interface/vchiq_arm/vchiq_arm.c | 73 ++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 0525211bcd65..9ade2f63606b 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -1206,6 +1206,76 @@ vchiq_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
return ret;
}
+#if defined(CONFIG_COMPAT)
+
+static long
+vchiq_ioctl_compat_internal(
+ struct file *file,
+ unsigned int cmd,
+ unsigned long arg)
+{
+ VCHIQ_INSTANCE_T instance = file->private_data;
+ VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+ VCHIQ_SERVICE_T *service = NULL;
+ long ret = 0;
+
+ DEBUG_INITIALISE(g_state.local)
+
+ vchiq_log_trace(vchiq_arm_log_level,
+ "vchiq_ioctl_compat - instance %pK, cmd %s, arg %lx",
+ instance,
+ ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) &&
+ (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ?
+ ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg);
+
+ switch (cmd) {
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+
+ if (service)
+ unlock_service(service);
+
+ if (ret == 0) {
+ if (status == VCHIQ_ERROR)
+ ret = -EIO;
+ else if (status == VCHIQ_RETRY)
+ ret = -EINTR;
+ }
+
+ if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) &&
+ (ret != -EWOULDBLOCK))
+ vchiq_log_info(vchiq_arm_log_level,
+ " ioctl_compat instance %lx, cmd %s -> status
%d, %ld",
+ (unsigned long)instance,
+ (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ?
+ ioctl_names[_IOC_NR(cmd)] :
+ "<invalid>",
+ status, ret);
+ else
+ vchiq_log_trace(vchiq_arm_log_level,
+ " ioctl_compat instance %lx, cmd %s -> status
%d, %ld",
+ (unsigned long)instance,
+ (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ?
+ ioctl_names[_IOC_NR(cmd)] :
+ "<invalid>",
+ status, ret);
+
+ return ret;
+}
+
+static long
+vchiq_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ default:
+ return vchiq_ioctl(file, cmd, arg);
+ }
+}
+
+#endif
+
/****************************************************************************
*
* vchiq_open
@@ -1660,6 +1730,9 @@ static const struct file_operations
vchiq_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = vchiq_ioctl,
+#if defined(CONFIG_COMPAT)
+ .compat_ioctl = vchiq_ioctl_compat,
+#endif
.open = vchiq_open,
.release = vchiq_release,
.read = vchiq_read
--
2.11.0
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