linux-kernel - [PATCH 4.19 15/88] usb: dwc3: core: Fix tx/rx threshold settings

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Message-Id: <20220510130734.190151470@linuxfoundation.org>
Date:   Tue, 10 May 2022 15:07:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Subject: [PATCH 4.19 15/88] usb: dwc3: core: Fix tx/rx threshold settings

From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

commit f28ad9069363dec7deb88032b70612755eed9ee6 upstream.

The current driver logic checks against 0 to determine whether the
periodic tx/rx threshold settings are set, but we may get bogus values
from uninitialized variables if no device property is set. Properly
default these variables to 0.

Fixes: 938a5ad1d305 ("usb: dwc3: Check for ESS TX/RX threshold config")
Cc: <stable@...r.kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Link: https://lore.kernel.org/r/cccfce990b11b730b0dae42f9d217dc6fb988c90.1649727139.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/core.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1213,10 +1213,10 @@ static void dwc3_get_properties(struct d
 	u8			lpm_nyet_threshold;
 	u8			tx_de_emphasis;
 	u8			hird_threshold;
-	u8			rx_thr_num_pkt_prd;
-	u8			rx_max_burst_prd;
-	u8			tx_thr_num_pkt_prd;
-	u8			tx_max_burst_prd;
+	u8			rx_thr_num_pkt_prd = 0;
+	u8			rx_max_burst_prd = 0;
+	u8			tx_thr_num_pkt_prd = 0;
+	u8			tx_max_burst_prd = 0;
 
 	/* default to highest possible threshold */
 	lpm_nyet_threshold = 0xf;