[PATCH v2 07/29] usb: usbtmc: Add support for 32 bit compat applications

[Guido Kiener]

32 bit applications can only call ioctl functions on 64 bit systems
when the field .compat_ioctl is defined for file operations.

Tested-by: Dave Penkler <dpenk...@gmail.com>
Signed-off-by: Guido Kiener <guido.kie...@rohde-schwarz.com>
Reviewed-by: Steve Bayless <steve_bayl...@keysight.com>
---
 drivers/usb/class/usbtmc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 1b7b2e402adb..d685db78b80b 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -18,6 +18,7 @@
 #include <linux/poll.h>
 #include <linux/mutex.h>
 #include <linux/usb.h>
+#include <linux/compat.h>
 #include <linux/usb/tmc.h>
 
 
@@ -1423,6 +1424,14 @@ static long usbtmc_ioctl(struct file *file, unsigned int 
cmd, unsigned long arg)
        return retval;
 }
 
+#ifdef CONFIG_COMPAT
+static long usbtmc_compat_ioctl(struct file *file, unsigned int cmd,
+                               unsigned long arg)
+{
+       return usbtmc_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static int usbtmc_fasync(int fd, struct file *file, int on)
 {
        struct usbtmc_file_data *file_data = file->private_data;
@@ -1459,6 +1468,9 @@ static const struct file_operations fops = {
        .open           = usbtmc_open,
        .release        = usbtmc_release,
        .unlocked_ioctl = usbtmc_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl   = usbtmc_compat_ioctl,
+#endif
        .fasync         = usbtmc_fasync,
        .poll           = usbtmc_poll,
        .llseek         = default_llseek,
-- 
2.17.1

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