USB: cdc-acm: add quirk for control-line state requests

Add new quirk for devices that cannot handle control-line state
requests.

Note that we currently send these requests to all devices, regardless of
whether they claim to support it, but that errors are only logged if
support is claimed.

Since commit 0943d8ead30e ("USB: cdc-acm: use tty-port dtr_rts"), which
only changed the timings for these requests slightly, this has been
reported to cause occasional firmware crashes on Simtec Electronics
Entropy Key devices after re-enumeration. Enable the quirk for this
device.

Reported-by: Nix <nix@esperi.org.uk>
Tested-by: Nix <nix@esperi.org.uk>
Cc: stable <stable@vger.kernel.org>	# v3.16
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index fc75651afe1c..d3251ebd09e2 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -121,6 +121,7 @@ struct acm {
         unsigned int throttle_req:1;                    /* throttle requested */
         u8 bInterval;
         struct usb_anchor delayed;                      /* writes queued for a device about to be woken */
+        unsigned long quirks;
 };
 
 #define CDC_DATA_INTERFACE_TYPE 0x0a
@@ -132,3 +133,4 @@ struct acm {
 #define NOT_A_MODEM                     BIT(3)
 #define NO_DATA_INTERFACE               BIT(4)
 #define IGNORE_DEVICE                   BIT(5)
+#define QUIRK_CONTROL_LINE_STATE        BIT(6)