netdev - [PATCH 3/3] usb: hso: remove bogus check for EINPROGRESS

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Message-Id: <20200805120709.4676-4-oneukum@suse.com>
Date:   Wed,  5 Aug 2020 14:07:09 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 3/3] usb: hso: remove bogus check for EINPROGRESS

This check an inherent race. It opens a race where
an error code has already been set or cleared yet
the URB has not been given back. We cannot do
such an optimization and must unlink unconditionally.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
---
 drivers/net/usb/hso.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 5762876e3105..2bb28db89432 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -831,8 +831,7 @@ static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
 	dev_warn(&net->dev, "Tx timed out.\n");
 
 	/* Tear the waiting frame off the list */
-	if (odev->mux_bulk_tx_urb &&
-	    (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
+	if (odev->mux_bulk_tx_urb)
 		usb_unlink_urb(odev->mux_bulk_tx_urb);
 
 	/* Update statistics */
-- 
2.16.4