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Imported from patchwork, patches marked with '=' have already been in our tree: [v3,1/4] cfg80211: add ratelimited variants of err and warn [v3,2/4] rt2x00: use ratelimited variants dev_warn/dev_err [v3,3/4] rt2x00: check number of EPROTO errors =[v3,4/4] rt2x00: do not print error when queue is full Signed-off-by: Daniel Golle <daniel@makrotopia.org>
97 lines
3.3 KiB
Diff
97 lines
3.3 KiB
Diff
From patchwork Tue Mar 12 09:51:42 2019
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com>
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X-Patchwork-Id: 10848961
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X-Patchwork-Delegate: kvalo@adurom.com
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From: Stanislaw Gruszka <sgruszka@redhat.com>
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To: linux-wireless@vger.kernel.org
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Cc: =?utf-8?q?Tomislav_Po=C5=BEega?= <pozega.tomislav@gmail.com>,
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Daniel Golle <daniel@makrotopia.org>, Felix Fietkau <nbd@nbd.name>,
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Mathias Kresin <dev@kresin.me>
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Subject: [PATCH v3 3/4] rt2x00: check number of EPROTO errors
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Date: Tue, 12 Mar 2019 10:51:42 +0100
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Message-Id: <1552384303-29529-4-git-send-email-sgruszka@redhat.com>
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In-Reply-To: <1552384303-29529-1-git-send-email-sgruszka@redhat.com>
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References: <1552384303-29529-1-git-send-email-sgruszka@redhat.com>
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Some USB host devices/drivers on some conditions can always return
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EPROTO error on submitted URBs. That can cause infinity loop in the
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rt2x00 driver.
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Since we can have single EPROTO errors we can not mark as device as
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removed to avoid infinity loop. However we can count consecutive
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EPROTO errors and mark device as removed if get lot of it.
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I choose number 10 as threshold.
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Reported-and-tested-by: Randy Oostdyk <linux-kernel@oostdyk.com>
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Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
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---
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drivers/net/wireless/ralink/rt2x00/rt2x00.h | 1 +
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drivers/net/wireless/ralink/rt2x00/rt2x00usb.c | 22 +++++++++++++++++++---
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2 files changed, 20 insertions(+), 3 deletions(-)
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--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
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+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
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@@ -1017,6 +1017,7 @@ struct rt2x00_dev {
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unsigned int extra_tx_headroom;
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struct usb_anchor *anchor;
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+ unsigned int num_proto_errs;
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/* Clock for System On Chip devices. */
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struct clk *clk;
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--- a/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
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+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00usb.c
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@@ -31,6 +31,22 @@
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#include "rt2x00.h"
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#include "rt2x00usb.h"
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+static bool rt2x00usb_check_usb_error(struct rt2x00_dev *rt2x00dev, int status)
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+{
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+ if (status == -ENODEV || status == -ENOENT)
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+ return true;
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+
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+ if (status == -EPROTO || status == -ETIMEDOUT)
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+ rt2x00dev->num_proto_errs++;
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+ else
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+ rt2x00dev->num_proto_errs = 0;
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+
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+ if (rt2x00dev->num_proto_errs > 3)
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+ return true;
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+
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+ return false;
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+}
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+
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/*
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* Interfacing with the HW.
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*/
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@@ -57,7 +73,7 @@ int rt2x00usb_vendor_request(struct rt2x
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if (status >= 0)
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return 0;
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- if (status == -ENODEV || status == -ENOENT) {
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+ if (rt2x00usb_check_usb_error(rt2x00dev, status)) {
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/* Device has disappeared. */
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clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
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break;
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@@ -321,7 +337,7 @@ static bool rt2x00usb_kick_tx_entry(stru
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status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
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if (status) {
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- if (status == -ENODEV || status == -ENOENT)
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+ if (rt2x00usb_check_usb_error(rt2x00dev, status))
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clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
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set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
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rt2x00lib_dmadone(entry);
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@@ -410,7 +426,7 @@ static bool rt2x00usb_kick_rx_entry(stru
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status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
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if (status) {
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- if (status == -ENODEV || status == -ENOENT)
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+ if (rt2x00usb_check_usb_error(rt2x00dev, status))
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clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
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set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
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rt2x00lib_dmadone(entry);
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