linux-kernel - [PATCH 5/5] spi: zynqmp-gqspi: Always acknowledge interrupts

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20250116224130.2684544-6-sean.anderson@linux.dev>
Date: Thu, 16 Jan 2025 17:41:30 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Mark Brown <broonie@...nel.org>,
	Michal Simek <michal.simek@....com>,
	linux-spi@...r.kernel.org
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Jinjie Ruan <ruanjinjie@...wei.com>,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH 5/5] spi: zynqmp-gqspi: Always acknowledge interrupts

RXEMPTY can cause an IRQ, even though we may not do anything about it
(such as if we are waiting for more received data). We must still handle
these IRQs because we can tell they were caused by the device.

Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
---

 drivers/spi/spi-zynqmp-gqspi.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index b47973db3490..339639904a7f 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -806,7 +806,6 @@ static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
 static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 {
 	struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id;
-	irqreturn_t ret = IRQ_NONE;
 	u32 status, mask, dma_status = 0;
 
 	status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
@@ -821,27 +820,24 @@ static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
 				   dma_status);
 	}
 
-	if (mask & GQSPI_ISR_TXNOT_FULL_MASK) {
+	if (!mask && !dma_status)
+		return IRQ_NONE;
+
+	if (mask & GQSPI_ISR_TXNOT_FULL_MASK)
 		zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
-		ret = IRQ_HANDLED;
-	}
 
-	if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) {
+	if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK)
 		zynqmp_process_dma_irq(xqspi);
-		ret = IRQ_HANDLED;
-	} else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
-			(mask & GQSPI_IER_GENFIFOEMPTY_MASK)) {
+	else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
+			(mask & GQSPI_IER_GENFIFOEMPTY_MASK))
 		zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
-		ret = IRQ_HANDLED;
-	}
 
 	if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 &&
 	    ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
 		zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
 		complete(&xqspi->data_completion);
-		ret = IRQ_HANDLED;
 	}
-	return ret;
+	return IRQ_HANDLED;
 }
 
 /**
-- 
2.35.1.1320.gc452695387.dirty