This is a note to let you know that I've just added the patch titled

USB: serial: io_edgeport: fix epic endpoint lookup

to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 7c5a2df3367a2c4984f1300261345817d95b71f8 Mon Sep 17 00:00:00 2001

From: Johan Hovold johan@kernel.org Date: Tue, 10 Dec 2019 12:26:01 +0100 Subject: USB: serial: io_edgeport: fix epic endpoint lookup

Make sure to use the current alternate setting when looking up the endpoints on epic devices to avoid binding to an invalid interface.

Failing to do so could cause the driver to misbehave or trigger a WARN() in usb_submit_urb() that kernels with panic_on_warn set would choke on.

Fixes: 6e8cf7751f9f ("USB: add EPIC support to the io_edgeport driver") Cc: stable stable@vger.kernel.org # 2.6.21 Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191210112601.3561-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/serial/io_edgeport.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c index 48a439298a68..9690a5f4b9d6 100644 --- a/drivers/usb/serial/io_edgeport.c +++ b/drivers/usb/serial/io_edgeport.c @@ -2901,16 +2901,18 @@ static int edge_startup(struct usb_serial *serial) response = 0;

if (edge_serial->is_epic) { + struct usb_host_interface *alt; + + alt = serial->interface->cur_altsetting; + /* EPIC thing, set up our interrupt polling now and our read * urb, so that the device knows it really is connected. */ interrupt_in_found = bulk_in_found = bulk_out_found = false; - for (i = 0; i < serial->interface->altsetting[0] - .desc.bNumEndpoints; ++i) { + for (i = 0; i < alt->desc.bNumEndpoints; ++i) { struct usb_endpoint_descriptor *endpoint; int buffer_size;

- endpoint = &serial->interface->altsetting[0]. - endpoint[i].desc; + endpoint = &alt->endpoint[i].desc; buffer_size = usb_endpoint_maxp(endpoint); if (!interrupt_in_found && (usb_endpoint_is_int_in(endpoint))) {