linux-kernel - [PATCH AUTOSEL 5.4 66/84] mfd: dln2: Fix sanity checking for endpoints

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Date:   Wed, 15 Apr 2020 07:44:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.4 66/84] mfd: dln2: Fix sanity checking for endpoints

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit fb945c95a482200876993977008b67ea658bd938 ]

While the commit 2b8bd606b1e6 ("mfd: dln2: More sanity checking for endpoints")
tries to harden the sanity checks it made at the same time a regression,
i.e.  mixed in and out endpoints. Obviously it should have been not tested on
real hardware at that time, but unluckily it didn't happen.

So, fix above mentioned typo and make device being enumerated again.

While here, introduce an enumerator for magic values to prevent similar issue
to happen in the future.

Fixes: 2b8bd606b1e6 ("mfd: dln2: More sanity checking for endpoints")
Cc: Oliver Neukum <oneukum@...e.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mfd/dln2.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
index 7841c11411d08..4faa8d2e5d045 100644
--- a/drivers/mfd/dln2.c
+++ b/drivers/mfd/dln2.c
@@ -90,6 +90,11 @@ struct dln2_mod_rx_slots {
 	spinlock_t lock;
 };
 
+enum dln2_endpoint {
+	DLN2_EP_OUT	= 0,
+	DLN2_EP_IN	= 1,
+};
+
 struct dln2_dev {
 	struct usb_device *usb_dev;
 	struct usb_interface *interface;
@@ -733,10 +738,10 @@ static int dln2_probe(struct usb_interface *interface,
 	    hostif->desc.bNumEndpoints < 2)
 		return -ENODEV;
 
-	epin = &hostif->endpoint[0].desc;
-	epout = &hostif->endpoint[1].desc;
+	epout = &hostif->endpoint[DLN2_EP_OUT].desc;
 	if (!usb_endpoint_is_bulk_out(epout))
 		return -ENODEV;
+	epin = &hostif->endpoint[DLN2_EP_IN].desc;
 	if (!usb_endpoint_is_bulk_in(epin))
 		return -ENODEV;
 
-- 
2.20.1