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