linux-kernel - [PATCH 5.15 027/171] can: m_can: pci: fix iomap_read_fifo() and iomap_write

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Message-Id: <20211213092945.977261704@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:29:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matt Kline <matt@...bashing.io>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.15 027/171] can: m_can: pci: fix iomap_read_fifo() and iomap_write_fifo()

From: Matthias Schiffer <matthias.schiffer@...tq-group.com>

commit d737de2d7cc3efdacbf17d4e22efc75697bd76d9 upstream.

The same fix that was previously done in m_can_platform in commit
99d173fbe894 ("can: m_can: fix iomap_read_fifo() and iomap_write_fifo()")
is required in m_can_pci as well to make iomap_read_fifo() and
iomap_write_fifo() work for val_count > 1.

Fixes: 812270e5445b ("can: m_can: Batch FIFO writes during CAN transmit")
Fixes: 1aa6772f64b4 ("can: m_can: Batch FIFO reads during CAN receive")
Link: https://lore.kernel.org/all/20211118144011.10921-1-matthias.schiffer@ew.tq-group.com
Cc: stable@...r.kernel.org
Cc: Matt Kline <matt@...bashing.io>
Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
Tested-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/m_can/m_can_pci.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/net/can/m_can/m_can_pci.c
+++ b/drivers/net/can/m_can/m_can_pci.c
@@ -42,8 +42,13 @@ static u32 iomap_read_reg(struct m_can_c
 static int iomap_read_fifo(struct m_can_classdev *cdev, int offset, void *val, size_t val_count)
 {
 	struct m_can_pci_priv *priv = cdev_to_priv(cdev);
+	void __iomem *src = priv->base + offset;
 
-	ioread32_rep(priv->base + offset, val, val_count);
+	while (val_count--) {
+		*(unsigned int *)val = ioread32(src);
+		val += 4;
+		src += 4;
+	}
 
 	return 0;
 }
@@ -61,8 +66,13 @@ static int iomap_write_fifo(struct m_can
 			    const void *val, size_t val_count)
 {
 	struct m_can_pci_priv *priv = cdev_to_priv(cdev);
+	void __iomem *dst = priv->base + offset;
 
-	iowrite32_rep(priv->base + offset, val, val_count);
+	while (val_count--) {
+		iowrite32(*(unsigned int *)val, dst);
+		val += 4;
+		dst += 4;
+	}
 
 	return 0;
 }