diff options
Diffstat (limited to 'package/kernel/mac80211/patches/rt2x00/022-rt2x00-check-number-of-EPROTO-errors.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/rt2x00/022-rt2x00-check-number-of-EPROTO-errors.patch | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/rt2x00/022-rt2x00-check-number-of-EPROTO-errors.patch b/package/kernel/mac80211/patches/rt2x00/022-rt2x00-check-number-of-EPROTO-errors.patch new file mode 100644 index 0000000000..251ac287bf --- /dev/null +++ b/package/kernel/mac80211/patches/rt2x00/022-rt2x00-check-number-of-EPROTO-errors.patch @@ -0,0 +1,96 @@ +From patchwork Tue Mar 12 09:51:42 2019 +Content-Type: text/plain; charset="utf-8" +MIME-Version: 1.0 +Content-Transfer-Encoding: 7bit +X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com> +X-Patchwork-Id: 10848961 +X-Patchwork-Delegate: kvalo@adurom.com +From: Stanislaw Gruszka <sgruszka@redhat.com> +To: linux-wireless@vger.kernel.org +Cc: =?utf-8?q?Tomislav_Po=C5=BEega?= <pozega.tomislav@gmail.com>, + Daniel Golle <daniel@makrotopia.org>, Felix Fietkau <nbd@nbd.name>, + Mathias Kresin <dev@kresin.me> +Subject: [PATCH v3 3/4] rt2x00: check number of EPROTO errors +Date: Tue, 12 Mar 2019 10:51:42 +0100 +Message-Id: <1552384303-29529-4-git-send-email-sgruszka@redhat.com> +In-Reply-To: <1552384303-29529-1-git-send-email-sgruszka@redhat.com> +References: <1552384303-29529-1-git-send-email-sgruszka@redhat.com> + +Some USB host devices/drivers on some conditions can always return +EPROTO error on submitted URBs. That can cause infinity loop in the +rt2x00 driver. + +Since we can have single EPROTO errors we can not mark as device as +removed to avoid infinity loop. However we can count consecutive +EPROTO errors and mark device as removed if get lot of it. +I choose number 10 as threshold. + +Reported-and-tested-by: Randy Oostdyk <linux-kernel@oostdyk.com> +Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> +--- + drivers/net/wireless/ralink/rt2x00/rt2x00.h | 1 + + drivers/net/wireless/ralink/rt2x00/rt2x00usb.c | 22 +++++++++++++++++++--- + 2 files changed, 20 insertions(+), 3 deletions(-) + +--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h ++++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h +@@ -1017,6 +1017,7 @@ struct rt2x00_dev { + unsigned int extra_tx_headroom; + + struct usb_anchor *anchor; ++ unsigned int num_proto_errs; + + /* Clock for System On Chip devices. */ + struct clk *clk; +--- 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 || status == -ETIMEDOUT) ++ rt2x00dev->num_proto_errs++; ++ else ++ rt2x00dev->num_proto_errs = 0; ++ ++ if (rt2x00dev->num_proto_errs > 3) ++ return true; ++ ++ return false; ++} ++ + /* + * Interfacing with the HW. + */ +@@ -57,7 +73,7 @@ int rt2x00usb_vendor_request(struct rt2x + 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(stru + + 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(stru + + 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); |