This is a note to let you know that I've just added the patch titled
USB: serial: suppress driver bind attributes
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 fdb838efa31e1ed9a13ae6ad0b64e30fdbd00570 Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Thu, 16 Jan 2020 17:07:05 +0100 Subject: USB: serial: suppress driver bind attributes
USB-serial drivers must not be unbound from their ports before the corresponding USB driver is unbound from the parent interface so suppress the bind and unbind attributes.
Unbinding a serial driver while it's port is open is a sure way to trigger a crash as any driver state is released on unbind while port hangup is handled on the parent USB interface level. Drivers for multiport devices where ports share a resource such as an interrupt endpoint also generally cannot handle individual ports going away.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org --- drivers/usb/serial/usb-serial.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 8f066bb55d7d..dc7a65b9ec98 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1317,6 +1317,9 @@ static int usb_serial_register(struct usb_serial_driver *driver) return -EINVAL; }
+ /* Prevent individual ports from being unbound. */ + driver->driver.suppress_bind_attrs = true; + usb_serial_operations_init(driver);
/* Add this device to our list of devices */