Re: wireless dongle causing entire machine to hang

[Stanislaw Gruszka <sgruszka@xxxxxxxxxx>]

On Thu, Aug 16, 2018 at 12:31:07PM +0200, Stanislaw Gruszka wrote:
> I prepared a patch that count EPROTO errors and if it's bigger
> than 10 mark device as gone. It should not make a problem
> when we will get one time random error.  I'm attaching it,
> please test.

Forgot to compile the patch, here is one that compiles.

Cheers
Stanislaw

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
index 086aad2..60b8bcc 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
@@ -31,6 +31,22 @@
 #include "rt2x00.h"
 #include "rt2x00usb.h"
 
+static bool rt2x00usb_check_usb_error(struct rt2x00_dev *rt2x00dev, int status)
+{
+	if (status == -ENODEV || status == -ENOENT)
+		return true;
+	
+	if (status == -EPROTO)
+		rt2x00dev->num_proto_errs++;
+	else
+		rt2x00dev->num_proto_errs = 0;
+
+	if (rt2x00dev->num_proto_errs > 10)
+		return true;
+
+	return false;
+}
+
 /*
  * Interfacing with the HW.
  */
@@ -57,7 +73,7 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 		if (status >= 0)
 			return 0;
 
-		if (status == -ENODEV || status == -ENOENT) {
+		if (rt2x00usb_check_usb_error(rt2x00dev, status)) {
 			/* Device has disappeared. */
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 			break;
@@ -321,7 +337,7 @@ static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void *data)
 
 	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 	if (status) {
-		if (status == -ENODEV || status == -ENOENT)
+		if (rt2x00usb_check_usb_error(rt2x00dev, status))
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 		rt2x00lib_dmadone(entry);
@@ -410,7 +426,7 @@ static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void *data)
 
 	status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
 	if (status) {
-		if (status == -ENODEV || status == -ENOENT)
+		if (rt2x00usb_check_usb_error(rt2x00dev, status))
 			clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
 		set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
 		rt2x00lib_dmadone(entry);