Commit 1da7cdab authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman Committed by Ben Hutchings

Revert "usbtmc: convert to devm_kzalloc"

commit ab21b63e upstream.

This reverts commit e6c7efdc.

Turns out it was totally wrong.  The memory is supposed to be bound to
the kref, as the original code was doing correctly, not the
device/driver binding as the devm_kzalloc() would cause.

This fixes an oops when read would be called after the device was
unbound from the driver.
Reported-by: default avatarLadislav Michl <ladis@linux-mips.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 38442f71
......@@ -120,6 +120,7 @@ static void usbtmc_delete(struct kref *kref)
struct usbtmc_device_data *data = to_usbtmc_data(kref);
usb_put_dev(data->usb_dev);
kfree(data);
}
static int usbtmc_open(struct inode *inode, struct file *filp)
......@@ -1103,7 +1104,7 @@ static int usbtmc_probe(struct usb_interface *intf,
dev_dbg(&intf->dev, "%s called\n", __func__);
data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(&intf->dev, "Unable to allocate kernel memory\n");
return -ENOMEM;
......
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