This is a note to let you know that I've just added the patch titled
USB: dummy-hcd: increase max number of devices to 32
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dummy-hcd-increase-max-number-of-devices-to-32.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8442b02bf3c6770e0d7e7ea17be36c30e95987b6 Mon Sep 17 00:00:00 2001
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Date: Mon, 21 Oct 2019 16:20:58 +0200
Subject: USB: dummy-hcd: increase max number of devices to 32
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/665578f904484069bb6100fb20283b22a046ad9b.1571667489.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/udc/dummy_hcd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -2739,7 +2739,7 @@ static struct platform_driver dummy_hcd_
};
/*-------------------------------------------------------------------------*/
-#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];
Patches currently in stable-queue which might be from andreyknvl@xxxxxxxxxx are
queue-4.19/usb-dummy-hcd-increase-max-number-of-devices-to-32.patch
queue-4.19/usb-dummy-hcd-use-usb_urb_dir_in-instead-of-usb_pipein.patch
