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authorJohan Hovold <johan@kernel.org>2014-11-06 18:08:33 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-06 21:25:40 +0100
commit2a8cdfde9237c4e1bd7c2e68c415b006491d23cc (patch)
treebad488692ec7149d3b326010b374f2419c80a139
parentMerge tag 'fixes-for-v3.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/... (diff)
downloadlinux-2a8cdfde9237c4e1bd7c2e68c415b006491d23cc.tar.xz
linux-2a8cdfde9237c4e1bd7c2e68c415b006491d23cc.zip
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>
-rw-r--r--drivers/usb/class/cdc-acm.c14
-rw-r--r--drivers/usb/class/cdc-acm.h2
2 files changed, 14 insertions, 2 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 9d6495424b06..077d58ac3dcb 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -148,8 +148,15 @@ static int acm_ctrl_msg(struct acm *acm, int request, int value,
/* devices aren't required to support these requests.
* the cdc acm descriptor tells whether they do...
*/
-#define acm_set_control(acm, control) \
- acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE, control, NULL, 0)
+static inline int acm_set_control(struct acm *acm, int control)
+{
+ if (acm->quirks & QUIRK_CONTROL_LINE_STATE)
+ return -EOPNOTSUPP;
+
+ return acm_ctrl_msg(acm, USB_CDC_REQ_SET_CONTROL_LINE_STATE,
+ control, NULL, 0);
+}
+
#define acm_set_line(acm, line) \
acm_ctrl_msg(acm, USB_CDC_REQ_SET_LINE_CODING, 0, line, sizeof *(line))
#define acm_send_break(acm, ms) \
@@ -1320,6 +1327,7 @@ made_compressed_probe:
tty_port_init(&acm->port);
acm->port.ops = &acm_port_ops;
init_usb_anchor(&acm->delayed);
+ acm->quirks = quirks;
buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
if (!buf) {
@@ -1687,6 +1695,8 @@ static const struct usb_device_id acm_ids[] = {
{ USB_DEVICE(0x0572, 0x1328), /* Shiro / Aztech USB MODEM UM-3100 */
.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
},
+ { USB_DEVICE(0x20df, 0x0001), /* Simtec Electronics Entropy Key */
+ .driver_info = QUIRK_CONTROL_LINE_STATE, },
{ USB_DEVICE(0x2184, 0x001c) }, /* GW Instek AFG-2225 */
{ USB_DEVICE(0x22b8, 0x6425), /* Motorola MOTOMAGX phones */
},
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)