netdev - [PATCH v2 2/5] spi: spi-fsl-dspi: Exit the ISR with IRQ

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190822211514.19288-3-olteanv@gmail.com>
Date:   Fri, 23 Aug 2019 00:15:11 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     broonie@...nel.org
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH v2 2/5] spi: spi-fsl-dspi: Exit the ISR with IRQ_NONE when it's not ours

The DSPI interrupt can be shared between two controllers at least on the
LX2160A. In that case, the driver for one controller might misbehave and
consume the other's interrupt. Fix this by actually checking if any of
the bits in the status register have been asserted.

Fixes: 13aed2392741 ("spi: spi-fsl-dspi: use IRQF_SHARED mode to request IRQ")
Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
 drivers/spi/spi-fsl-dspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index c90db7db4121..6ef2279a3699 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -659,7 +659,7 @@ static irqreturn_t dspi_interrupt(int irq, void *dev_id)
 	regmap_write(dspi->regmap, SPI_SR, spi_sr);
 
 	if (!(spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF)))
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	/* Get transfer counter (in number of SPI transfers). It was
 	 * reset to 0 when transfer(s) were started.
-- 
2.17.1