linux-kernel - [PATCH 5.16 009/200] can: m_can: m_can_fifo_{read,write}: dont read or write from/to FIFO if length is 0

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Date:   Mon, 31 Jan 2022 11:54:32 +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>,
        Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Michael Anochin <anochin@...to-meter.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.16 009/200] can: m_can: m_can_fifo_{read,write}: dont read or write from/to FIFO if length is 0

From: Marc Kleine-Budde <mkl@...gutronix.de>

commit db72589c49fd260bfc99c7160c079675bc7417af upstream.

In order to optimize FIFO access, especially on m_can cores attached
to slow busses like SPI, in patch

| e39381770ec9 ("can: m_can: Disable IRQs on FIFO bus errors")

bulk read/write support has been added to the m_can_fifo_{read,write}
functions.

That change leads to the tcan driver to call
regmap_bulk_{read,write}() with a length of 0 (for CAN frames with 0
data length). regmap treats this as an error:

| tcan4x5x spi1.0 tcan4x5x0: FIFO write returned -22

This patch fixes the problem by not calling the
cdev->ops->{read,write)_fifo() in case of a 0 length read/write.

Fixes: e39381770ec9 ("can: m_can: Disable IRQs on FIFO bus errors")
Link: https://lore.kernel.org/all/20220114155751.2651888-1-mkl@pengutronix.de
Cc: stable@...r.kernel.org
Cc: Matt Kline <matt@...bashing.io>
Cc: Chandrasekar Ramakrishnan <rcsekar@...sung.com>
Reported-by: Michael Anochin <anochin@...to-meter.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.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -336,6 +336,9 @@ m_can_fifo_read(struct m_can_classdev *c
 	u32 addr_offset = cdev->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE +
 		offset;
 
+	if (val_count == 0)
+		return 0;
+
 	return cdev->ops->read_fifo(cdev, addr_offset, val, val_count);
 }
 
@@ -346,6 +349,9 @@ m_can_fifo_write(struct m_can_classdev *
 	u32 addr_offset = cdev->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE +
 		offset;
 
+	if (val_count == 0)
+		return 0;
+
 	return cdev->ops->write_fifo(cdev, addr_offset, val, val_count);
 }