USB: dummy-hcd: increase max number of devices to 32

BugLink: https://bugs.launchpad.net/bugs/1861739
commit 8442b02bf3c6770e0d7e7ea17be36c30e95987b6 upstream.

When fuzzing the USB subsystem with syzkaller, we currently use 8 testing
processes within one VM. To isolate testing processes from one another it
is desirable to assign a dedicated USB bus to each of those, which means
we need at least 8 Dummy UDC/HCD devices.

This patch increases the maximum number of Dummy UDC/HCD devices to 32
(more than 8 in case we need more of them in the future).

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lore.kernel.org/r/665578f904484069bb6100fb20283b22a046ad9b.1571667489.git.andreyknvl@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 3297ad751805a5396336d0f1281341ae98f68d90..e87a29ecca35912b9c1962081688c386c64be159 100644 (file)
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -2753,7 +2753,7 @@ static struct platform_driver dummy_hcd_driver = {
 };
 
 /*-------------------------------------------------------------------------*/
-#define MAX_NUM_UDC    2
+#define MAX_NUM_UDC    32
 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];