misc: pci_endpoint_test: Avoid triggering a BUG()

If you call ida_simple_remove(&pci_endpoint_test_ida, id) with a negative
"id" then it triggers an immediate BUG_ON().  Let's not allow that.

Fixes: 2c156ac71c6b ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index c0d3230..d40a34f 100644 (file)
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -597,6 +597,8 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 
        if (sscanf(misc_device->name, DRV_MODULE_NAME ".%d", &id) != 1)
                return;
+       if (id < 0)
+               return;
 
        misc_deregister(&test->miscdev);
        ida_simple_remove(&pci_endpoint_test_ida, id);