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-rw-r--r--drivers/usb/class/cdc-acm.c79
-rw-r--r--drivers/usb/class/cdc-acm.h19
-rw-r--r--drivers/usb/class/cdc-wdm.c72
3 files changed, 105 insertions, 65 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 7f6f3ab5b8a6..30ef946a8e1a 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -173,7 +173,7 @@ static int acm_wb_alloc(struct acm *acm)
for (;;) {
wb = &acm->wb[wbn];
if (!wb->use) {
- wb->use = 1;
+ wb->use = true;
wb->len = 0;
return wbn;
}
@@ -191,7 +191,8 @@ static int acm_wb_is_avail(struct acm *acm)
n = ACM_NW;
spin_lock_irqsave(&acm->write_lock, flags);
for (i = 0; i < ACM_NW; i++)
- n -= acm->wb[i].use;
+ if(acm->wb[i].use)
+ n--;
spin_unlock_irqrestore(&acm->write_lock, flags);
return n;
}
@@ -201,7 +202,7 @@ static int acm_wb_is_avail(struct acm *acm)
*/
static void acm_write_done(struct acm *acm, struct acm_wb *wb)
{
- wb->use = 0;
+ wb->use = false;
acm->transmitting--;
usb_autopm_put_interface_async(acm->control);
}
@@ -741,7 +742,7 @@ static void acm_port_shutdown(struct tty_port *port)
if (!urb)
break;
wb = urb->context;
- wb->use = 0;
+ wb->use = false;
usb_autopm_put_interface_async(acm->control);
}
@@ -792,7 +793,7 @@ static int acm_tty_write(struct tty_struct *tty,
wb = &acm->wb[wbn];
if (!acm->dev) {
- wb->use = 0;
+ wb->use = false;
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
@@ -804,7 +805,7 @@ static int acm_tty_write(struct tty_struct *tty,
stat = usb_autopm_get_interface_async(acm->control);
if (stat) {
- wb->use = 0;
+ wb->use = false;
spin_unlock_irqrestore(&acm->write_lock, flags);
return stat;
}
@@ -1196,9 +1197,6 @@ static int acm_probe(struct usb_interface *intf,
return -EINVAL;
}
- if (!intf->cur_altsetting)
- return -EINVAL;
-
if (!buflen) {
if (intf->cur_altsetting->endpoint &&
intf->cur_altsetting->endpoint->extralen &&
@@ -1221,39 +1219,42 @@ static int acm_probe(struct usb_interface *intf,
call_intf_num = cmgmd->bDataInterface;
if (!union_header) {
- if (call_intf_num > 0) {
+ if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
+ dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
+ combined_interfaces = 1;
+ control_interface = data_interface = intf;
+ goto look_for_collapsed_interface;
+ } else if (call_intf_num > 0) {
dev_dbg(&intf->dev, "No union descriptor, using call management descriptor\n");
- /* quirks for Droids MuIn LCD */
- if (quirks & NO_DATA_INTERFACE) {
- data_interface = usb_ifnum_to_if(usb_dev, 0);
- } else {
- data_intf_num = call_intf_num;
- data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
- }
+ data_intf_num = call_intf_num;
+ data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
control_interface = intf;
} else {
- if (intf->cur_altsetting->desc.bNumEndpoints != 3) {
- dev_dbg(&intf->dev,"No union descriptor, giving up\n");
- return -ENODEV;
- } else {
- dev_warn(&intf->dev,"No union descriptor, testing for castrated device\n");
- combined_interfaces = 1;
- control_interface = data_interface = intf;
- goto look_for_collapsed_interface;
- }
+ dev_dbg(&intf->dev, "No union descriptor, giving up\n");
+ return -ENODEV;
}
} else {
+ int class = -1;
+
data_intf_num = union_header->bSlaveInterface0;
control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0);
data_interface = usb_ifnum_to_if(usb_dev, data_intf_num);
+
+ if (control_interface)
+ class = control_interface->cur_altsetting->desc.bInterfaceClass;
+
+ if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) {
+ dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n");
+ combined_interfaces = 1;
+ control_interface = data_interface = intf;
+ goto look_for_collapsed_interface;
+ }
}
if (!control_interface || !data_interface) {
dev_dbg(&intf->dev, "no interfaces\n");
return -ENODEV;
}
- if (!data_interface->cur_altsetting || !control_interface->cur_altsetting)
- return -ENODEV;
if (data_intf_num != call_intf_num)
dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n");
@@ -1280,10 +1281,8 @@ look_for_collapsed_interface:
skip_normal_probe:
/*workaround for switched interfaces */
- if (data_interface->cur_altsetting->desc.bInterfaceClass
- != CDC_DATA_INTERFACE_TYPE) {
- if (control_interface->cur_altsetting->desc.bInterfaceClass
- == CDC_DATA_INTERFACE_TYPE) {
+ if (data_interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA) {
+ if (control_interface->cur_altsetting->desc.bInterfaceClass == USB_CLASS_CDC_DATA) {
dev_dbg(&intf->dev,
"Your device has switched interfaces.\n");
swap(control_interface, data_interface);
@@ -1876,11 +1875,6 @@ static const struct usb_device_id acm_ids[] = {
/* NOTE: non-Nokia COMM/ACM/0xff is likely MSFT RNDIS... NOT a modem! */
- /* Support for Droids MuIn LCD */
- { USB_DEVICE(0x04d8, 0x000b),
- .driver_info = NO_DATA_INTERFACE,
- },
-
#if IS_ENABLED(CONFIG_INPUT_IMS_PCU)
{ USB_DEVICE(0x04d8, 0x0082), /* Application mode */
.driver_info = IGNORE_DEVICE,
@@ -1906,6 +1900,17 @@ static const struct usb_device_id acm_ids[] = {
.driver_info = IGNORE_DEVICE,
},
+ /* Exclude ETAS ES58x */
+ { USB_DEVICE(0x108c, 0x0159), /* ES581.4 */
+ .driver_info = IGNORE_DEVICE,
+ },
+ { USB_DEVICE(0x108c, 0x0168), /* ES582.1 */
+ .driver_info = IGNORE_DEVICE,
+ },
+ { USB_DEVICE(0x108c, 0x0169), /* ES584.1 */
+ .driver_info = IGNORE_DEVICE,
+ },
+
{ USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
.driver_info = SEND_ZERO_PACKET,
},
diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index cd5e9d8ab237..9dce179d031b 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -64,12 +64,12 @@
#define ACM_NR 16
struct acm_wb {
- unsigned char *buf;
+ u8 *buf;
dma_addr_t dmah;
- int len;
- int use;
+ unsigned int len;
struct urb *urb;
struct acm *instance;
+ bool use;
};
struct acm_rb {
@@ -131,15 +131,12 @@ struct acm {
unsigned long quirks;
};
-#define CDC_DATA_INTERFACE_TYPE 0x0a
-
/* constants describing various quirks and errors */
#define NO_UNION_NORMAL BIT(0)
#define SINGLE_RX_URB BIT(1)
#define NO_CAP_LINE BIT(2)
-#define NO_DATA_INTERFACE BIT(4)
-#define IGNORE_DEVICE BIT(5)
-#define QUIRK_CONTROL_LINE_STATE BIT(6)
-#define CLEAR_HALT_CONDITIONS BIT(7)
-#define SEND_ZERO_PACKET BIT(8)
-#define DISABLE_ECHO BIT(9)
+#define IGNORE_DEVICE BIT(3)
+#define QUIRK_CONTROL_LINE_STATE BIT(4)
+#define CLEAR_HALT_CONDITIONS BIT(5)
+#define SEND_ZERO_PACKET BIT(6)
+#define DISABLE_ECHO BIT(7)
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 7f5de956a2fc..02d0cfd23bb2 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -58,6 +58,9 @@ MODULE_DEVICE_TABLE (usb, wdm_ids);
#define WDM_MAX 16
+/* we cannot wait forever at flush() */
+#define WDM_FLUSH_TIMEOUT (30 * HZ)
+
/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */
#define WDM_DEFAULT_BUFSIZE 256
@@ -151,7 +154,7 @@ static void wdm_out_callback(struct urb *urb)
kfree(desc->outbuf);
desc->outbuf = NULL;
clear_bit(WDM_IN_USE, &desc->flags);
- wake_up(&desc->wait);
+ wake_up_all(&desc->wait);
}
static void wdm_in_callback(struct urb *urb)
@@ -393,6 +396,9 @@ static ssize_t wdm_write
if (test_bit(WDM_RESETTING, &desc->flags))
r = -EIO;
+ if (test_bit(WDM_DISCONNECTING, &desc->flags))
+ r = -ENODEV;
+
if (r < 0) {
rv = r;
goto out_free_mem_pm;
@@ -424,6 +430,7 @@ static ssize_t wdm_write
if (rv < 0) {
desc->outbuf = NULL;
clear_bit(WDM_IN_USE, &desc->flags);
+ wake_up_all(&desc->wait); /* for wdm_wait_for_response() */
dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv);
rv = usb_translate_errors(rv);
goto out_free_mem_pm;
@@ -583,28 +590,58 @@ err:
return rv;
}
-static int wdm_flush(struct file *file, fl_owner_t id)
+static int wdm_wait_for_response(struct file *file, long timeout)
{
struct wdm_device *desc = file->private_data;
+ long rv; /* Use long here because (int) MAX_SCHEDULE_TIMEOUT < 0. */
+
+ /*
+ * Needs both flags. We cannot do with one because resetting it would
+ * cause a race with write() yet we need to signal a disconnect.
+ */
+ rv = wait_event_interruptible_timeout(desc->wait,
+ !test_bit(WDM_IN_USE, &desc->flags) ||
+ test_bit(WDM_DISCONNECTING, &desc->flags),
+ timeout);
- wait_event(desc->wait,
- /*
- * needs both flags. We cannot do with one
- * because resetting it would cause a race
- * with write() yet we need to signal
- * a disconnect
- */
- !test_bit(WDM_IN_USE, &desc->flags) ||
- test_bit(WDM_DISCONNECTING, &desc->flags));
-
- /* cannot dereference desc->intf if WDM_DISCONNECTING */
+ /*
+ * To report the correct error. This is best effort.
+ * We are inevitably racing with the hardware.
+ */
if (test_bit(WDM_DISCONNECTING, &desc->flags))
return -ENODEV;
- if (desc->werr < 0)
- dev_err(&desc->intf->dev, "Error in flush path: %d\n",
- desc->werr);
+ if (!rv)
+ return -EIO;
+ if (rv < 0)
+ return -EINTR;
+
+ spin_lock_irq(&desc->iuspin);
+ rv = desc->werr;
+ desc->werr = 0;
+ spin_unlock_irq(&desc->iuspin);
+
+ return usb_translate_errors(rv);
+
+}
+
+/*
+ * You need to send a signal when you react to malicious or defective hardware.
+ * Also, don't abort when fsync() returned -EINVAL, for older kernels which do
+ * not implement wdm_flush() will return -EINVAL.
+ */
+static int wdm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ return wdm_wait_for_response(file, MAX_SCHEDULE_TIMEOUT);
+}
- return usb_translate_errors(desc->werr);
+/*
+ * Same with wdm_fsync(), except it uses finite timeout in order to react to
+ * malicious or defective hardware which ceased communication after close() was
+ * implicitly called due to process termination.
+ */
+static int wdm_flush(struct file *file, fl_owner_t id)
+{
+ return wdm_wait_for_response(file, WDM_FLUSH_TIMEOUT);
}
static __poll_t wdm_poll(struct file *file, struct poll_table_struct *wait)
@@ -729,6 +766,7 @@ static const struct file_operations wdm_fops = {
.owner = THIS_MODULE,
.read = wdm_read,
.write = wdm_write,
+ .fsync = wdm_fsync,
.open = wdm_open,
.flush = wdm_flush,
.release = wdm_release,
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 02:45:19 +0000