linux-kernel - [PATCH 5.4 036/270] spi: rockchip: Fix error in SPI slave pio read

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Message-Id: <20200817143757.592848129@linuxfoundation.org>
Date:   Mon, 17 Aug 2020 17:13:57 +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, Jon Lin <jon.lin@...k-chips.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Heiko Stuebner <heiko@...ech.de>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 036/270] spi: rockchip: Fix error in SPI slave pio read

From: Jon Lin <jon.lin@...k-chips.com>

[ Upstream commit 4294e4accf8d695ea5605f6b189008b692e3e82c ]

The RXFLR is possible larger than rx_left in Rockchip SPI, fix it.

Fixes: 01b59ce5dac8 ("spi: rockchip: use irq rather than polling")
Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
Tested-by: Emil Renner Berthing <kernel@...il.dk>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Reviewed-by: Emil Renner Berthing <kernel@...il.dk>
Link: https://lore.kernel.org/r/20200723004356.6390-3-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-rockchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 2cc6d9951b52e..008b64f4e031a 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -286,7 +286,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
 static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
 {
 	u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
-	u32 rx_left = rs->rx_left - words;
+	u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0;
 
 	/* the hardware doesn't allow us to change fifo threshold
 	 * level while spi is enabled, so instead make sure to leave
-- 
2.25.1