linux-kernel - [PATCH v2 1/2] USB: dummy-hcd: increase max number of devices to 32

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Message-Id: <665578f904484069bb6100fb20283b22a046ad9b.1571667489.git.andreyknvl@google.com>
Date:   Mon, 21 Oct 2019 16:20:58 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "Jacky . Cao @ sony . com" <Jacky.Cao@...y.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v2 1/2] USB: dummy-hcd: increase max number of devices to 32

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@...gle.com>
---
 drivers/usb/gadget/udc/dummy_hcd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 3d499d93c083..a8f1e5707c14 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -2725,7 +2725,7 @@ 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];
 
-- 
2.23.0.866.gb869b98d4c-goog