[PATCH 0/9] upcoming pull request: const annoations + flexcan + janz-ican3 update

[PATCH 0/9] upcoming pull request: const annoations + flexcan + janz-ican3 update

[Marc Kleine-Budde]

Hello,

this is my upcoming pull request to David. Ira, I had a trivial conflict
while merging your patches. Further I improved the ican3_to_can_frame and
can_frame_to_ican3 functions. The helper "get_can_dlc()" is to limit the
dlc value coming from the controller, further only dlc bytes are copied
from and to the controller, not the whole frame. (see patch 5/9).

This pull request will also contain the flexcan update for imx53 and the
bittiming_const annotation posted earlier this week.

Pleae review and test.
Feel free to send Acked-by, Tested-by, Reviewed-by etc :)

regards, Marc

[PATCH 1/9] can: mark bittiming_const pointer in struct can_priv as const

[Marc Kleine-Budde]

This patch marks the bittiming_const pointer as in the struct can_pric as
"const". This allows us to mark the struct can_bittiming_const in the CAN
drivers as "const", too.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/at91_can.c                   |    2 +-
 drivers/net/can/bfin_can.c                   |    2 +-
 drivers/net/can/c_can/c_can.c                |    2 +-
 drivers/net/can/cc770/cc770.c                |    2 +-
 drivers/net/can/flexcan.c                    |    2 +-
 drivers/net/can/janz-ican3.c                 |    2 +-
 drivers/net/can/mcp251x.c                    |    2 +-
 drivers/net/can/mscan/mscan.c                |    2 +-
 drivers/net/can/pch_can.c                    |    2 +-
 drivers/net/can/sja1000/sja1000.c            |    2 +-
 drivers/net/can/ti_hecc.c                    |    2 +-
 drivers/net/can/usb/ems_usb.c                |    2 +-
 drivers/net/can/usb/esd_usb2.c               |    2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h |    2 +-
 include/linux/can/dev.h                      |    2 +-
 15 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 6ea905c..fcff73a 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -170,7 +170,7 @@ static const struct at91_devtype_data at91_devtype_data[] __devinitconst = {
 	},
 };
 
-static struct can_bittiming_const at91_bittiming_const = {
+static const struct can_bittiming_const at91_bittiming_const = {
 	.name		= KBUILD_MODNAME,
 	.tseg1_min	= 4,
 	.tseg1_max	= 16,
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
index ea31438..f2d6d25 100644
--- a/drivers/net/can/bfin_can.c
+++ b/drivers/net/can/bfin_can.c
@@ -44,7 +44,7 @@ struct bfin_can_priv {
 /*
  * bfin can timing parameters
  */
-static struct can_bittiming_const bfin_can_bittiming_const = {
+static const struct can_bittiming_const bfin_can_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index eea6608..4c538e3 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -189,7 +189,7 @@ enum c_can_bus_error_types {
 	C_CAN_ERROR_PASSIVE,
 };
 
-static struct can_bittiming_const c_can_bittiming_const = {
+static const struct can_bittiming_const c_can_bittiming_const = {
 	.name = KBUILD_MODNAME,
 	.tseg1_min = 2,		/* Time segment 1 = prop_seg + phase_seg1 */
 	.tseg1_max = 16,
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index a138db1..0f12abf 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -90,7 +90,7 @@ static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
 	[CC770_OBJ_TX] = 0,
 };
 
-static struct can_bittiming_const cc770_bittiming_const = {
+static const struct can_bittiming_const cc770_bittiming_const = {
 	.name = KBUILD_MODNAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 1b6f562..c8a6fc7 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -203,7 +203,7 @@ static struct flexcan_devtype_data fsl_imx6q_devtype_data = {
 	.hw_ver = 10,
 };
 
-static struct can_bittiming_const flexcan_bittiming_const = {
+static const struct can_bittiming_const flexcan_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 4,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 08c893c..e7d1532 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1490,7 +1490,7 @@ static const struct net_device_ops ican3_netdev_ops = {
  */
 
 /* This structure was stolen from drivers/net/can/sja1000/sja1000.c */
-static struct can_bittiming_const ican3_bittiming_const = {
+static const struct can_bittiming_const ican3_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index 9120a36..a580db2 100644
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -214,7 +214,7 @@ static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */
 module_param(mcp251x_enable_dma, int, S_IRUGO);
 MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)");
 
-static struct can_bittiming_const mcp251x_bittiming_const = {
+static const struct can_bittiming_const mcp251x_bittiming_const = {
 	.name = DEVICE_NAME,
 	.tseg1_min = 3,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/mscan/mscan.c b/drivers/net/can/mscan/mscan.c
index 41a2a2d..2b104d5 100644
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@@ -34,7 +34,7 @@
 
 #include "mscan.h"
 
-static struct can_bittiming_const mscan_bittiming_const = {
+static const struct can_bittiming_const mscan_bittiming_const = {
 	.name = "mscan",
 	.tseg1_min = 4,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 1226297..48b3d62 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -184,7 +184,7 @@ struct pch_can_priv {
 	int use_msi;
 };
 
-static struct can_bittiming_const pch_can_bittiming_const = {
+static const struct can_bittiming_const pch_can_bittiming_const = {
 	.name = KBUILD_MODNAME,
 	.tseg1_min = 2,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 5e10472..4c4f33d 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -69,7 +69,7 @@ MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
 
-static struct can_bittiming_const sja1000_bittiming_const = {
+static const struct can_bittiming_const sja1000_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 4accd7e..527dbcf 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -196,7 +196,7 @@ MODULE_VERSION(HECC_MODULE_VERSION);
 #define HECC_CANGIM_SIL		BIT(2)	/* system interrupts to int line 1 */
 
 /* CAN Bittiming constants as per HECC specs */
-static struct can_bittiming_const ti_hecc_bittiming_const = {
+static const struct can_bittiming_const ti_hecc_bittiming_const = {
 	.name = DRV_NAME,
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index 7ae65fc..086fa32 100644
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -889,7 +889,7 @@ static const struct net_device_ops ems_usb_netdev_ops = {
 	.ndo_start_xmit = ems_usb_start_xmit,
 };
 
-static struct can_bittiming_const ems_usb_bittiming_const = {
+static const struct can_bittiming_const ems_usb_bittiming_const = {
 	.name = "ems_usb",
 	.tseg1_min = 1,
 	.tseg1_max = 16,
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index 09b1da5..bd36e55 100644
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -871,7 +871,7 @@ static const struct net_device_ops esd_usb2_netdev_ops = {
 	.ndo_start_xmit = esd_usb2_start_xmit,
 };
 
-static struct can_bittiming_const esd_usb2_bittiming_const = {
+static const struct can_bittiming_const esd_usb2_bittiming_const = {
 	.name = "esd_usb2",
 	.tseg1_min = ESD_USB2_TSEG1_MIN,
 	.tseg1_max = ESD_USB2_TSEG1_MAX,
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
index a948c5a..4c775b6 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.h
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
@@ -45,7 +45,7 @@ struct peak_usb_adapter {
 	char *name;
 	u32 device_id;
 	struct can_clock clock;
-	struct can_bittiming_const bittiming_const;
+	const struct can_bittiming_const bittiming_const;
 	unsigned int ctrl_count;
 
 	int (*intf_probe)(struct usb_interface *intf);
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index ee5a771..2b2fc34 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -33,7 +33,7 @@ struct can_priv {
 	struct can_device_stats can_stats;
 
 	struct can_bittiming bittiming;
-	struct can_bittiming_const *bittiming_const;
+	const struct can_bittiming_const *bittiming_const;
 	struct can_clock clock;
 
 	enum can_state state;
-- 
1.7.10

[PATCH 2/9] can: flexcan: add 2nd clock to support imx53 and newer

[Marc Kleine-Budde]

From: Steffen Trumtrar <s.trumtrar@pengutronix.de>

This patch adds support for a second clock to the flexcan driver. On
modern freescale ARM cores like the imx53 and imx6q two clocks ("ipg"
and "per") must be enabled in order to access the CAN core.

In the original driver, the clock was requested without specifying the
connection id, further all mainline ARM archs with flexcan support
(imx28, imx25, imx35) register their flexcan clock without a
connection id, too.

This patch first renames the existing clk variable to clk_ipg and
converts it to devm for easier error handling. The connection id "ipg"
is added to the devm_clk_get() call. Then a second clock "per" is
requested. As all archs don't specify a connection id, both clk_get
return the same clock. This ensures compatibility to existing flexcan
support and adds support for imx53 at the same time.

After this patch hits mainline, the archs may give their existing
flexcan clock the "ipg" connection id and implement a dummy "per"
clock.

This patch has been tested on imx28 (unmodified clk tree) and on imx53
with a seperate "ipg" and "per" clock.

Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Acked-by: Hui Wang <jason77.wang@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/flexcan.c |   45 +++++++++++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index c8a6fc7..c5f1431 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -190,7 +190,8 @@ struct flexcan_priv {
 	u32 reg_esr;
 	u32 reg_ctrl_default;
 
-	struct clk *clk;
+	struct clk *clk_ipg;
+	struct clk *clk_per;
 	struct flexcan_platform_data *pdata;
 	const struct flexcan_devtype_data *devtype_data;
 };
@@ -828,7 +829,8 @@ static int flexcan_open(struct net_device *dev)
 	struct flexcan_priv *priv = netdev_priv(dev);
 	int err;
 
-	clk_prepare_enable(priv->clk);
+	clk_prepare_enable(priv->clk_ipg);
+	clk_prepare_enable(priv->clk_per);
 
 	err = open_candev(dev);
 	if (err)
@@ -850,7 +852,8 @@ static int flexcan_open(struct net_device *dev)
  out_close:
 	close_candev(dev);
  out:
-	clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk_per);
+	clk_disable_unprepare(priv->clk_ipg);
 
 	return err;
 }
@@ -864,7 +867,8 @@ static int flexcan_close(struct net_device *dev)
 	flexcan_chip_stop(dev);
 
 	free_irq(dev->irq, dev);
-	clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk_per);
+	clk_disable_unprepare(priv->clk_ipg);
 
 	close_candev(dev);
 
@@ -903,7 +907,8 @@ static int __devinit register_flexcandev(struct net_device *dev)
 	struct flexcan_regs __iomem *regs = priv->base;
 	u32 reg, err;
 
-	clk_prepare_enable(priv->clk);
+	clk_prepare_enable(priv->clk_ipg);
+	clk_prepare_enable(priv->clk_per);
 
 	/* select "bus clock", chip must be disabled */
 	flexcan_chip_disable(priv);
@@ -936,7 +941,8 @@ static int __devinit register_flexcandev(struct net_device *dev)
  out:
 	/* disable core and turn off clocks */
 	flexcan_chip_disable(priv);
-	clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk_per);
+	clk_disable_unprepare(priv->clk_ipg);
 
 	return err;
 }
@@ -964,7 +970,7 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
 	struct net_device *dev;
 	struct flexcan_priv *priv;
 	struct resource *mem;
-	struct clk *clk = NULL;
+	struct clk *clk_ipg = NULL, *clk_per = NULL;
 	struct pinctrl *pinctrl;
 	void __iomem *base;
 	resource_size_t mem_size;
@@ -980,13 +986,20 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
 						"clock-frequency", &clock_freq);
 
 	if (!clock_freq) {
-		clk = clk_get(&pdev->dev, NULL);
-		if (IS_ERR(clk)) {
-			dev_err(&pdev->dev, "no clock defined\n");
-			err = PTR_ERR(clk);
+		clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+		if (IS_ERR(clk_ipg)) {
+			dev_err(&pdev->dev, "no ipg clock defined\n");
+			err = PTR_ERR(clk_ipg);
+			goto failed_clock;
+		}
+		clock_freq = clk_get_rate(clk_ipg);
+
+		clk_per = devm_clk_get(&pdev->dev, "per");
+		if (IS_ERR(clk_per)) {
+			dev_err(&pdev->dev, "no per clock defined\n");
+			err = PTR_ERR(clk_per);
 			goto failed_clock;
 		}
-		clock_freq = clk_get_rate(clk);
 	}
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1039,7 +1052,8 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
 		CAN_CTRLMODE_BERR_REPORTING;
 	priv->base = base;
 	priv->dev = dev;
-	priv->clk = clk;
+	priv->clk_ipg = clk_ipg;
+	priv->clk_per = clk_per;
 	priv->pdata = pdev->dev.platform_data;
 	priv->devtype_data = devtype_data;
 
@@ -1067,8 +1081,6 @@ static int __devinit flexcan_probe(struct platform_device *pdev)
  failed_map:
 	release_mem_region(mem->start, mem_size);
  failed_get:
-	if (clk)
-		clk_put(clk);
  failed_clock:
 	return err;
 }
@@ -1086,9 +1098,6 @@ static int __devexit flexcan_remove(struct platform_device *pdev)
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(mem->start, resource_size(mem));
 
-	if (priv->clk)
-		clk_put(priv->clk);
-
 	free_candev(dev);
 
 	return 0;
-- 
1.7.10

[PATCH 3/9] can: janz-ican3: remove dead code

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

The code which used this variable was removed during review, before the
driver was added to mainline Linux. It is now dead code, and can be
removed.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index e7d1532..f41623d 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -235,7 +235,6 @@ struct ican3_dev {
 
 	/* fast host interface */
 	unsigned int fastrx_start;
-	unsigned int fastrx_int;
 	unsigned int fastrx_num;
 	unsigned int fasttx_start;
 	unsigned int fasttx_num;
@@ -454,7 +453,6 @@ static void __devinit ican3_init_fast_host_interface(struct ican3_dev *mod)
 	/* save the start recv page */
 	mod->fastrx_start = mod->free_page;
 	mod->fastrx_num = 0;
-	mod->fastrx_int = 0;
 
 	/* build a single fast tohost queue descriptor */
 	memset(&desc, 0, sizeof(desc));
-- 
1.7.10

[PATCH 4/9] can: janz-ican3: drop invalid skbs

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

The commit which added the janz-ican3 driver and commit
3ccd4c61 "can: Unify droping of invalid tx skbs and netdev stats" were
committed into mainline Linux during the same merge window.

Therefore, the addition of this code to the janz-ican3 driver was
forgotten. This patch adds the expected code.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index f41623d..754b803 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1420,6 +1420,9 @@ static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
 	void __iomem *desc_addr;
 	unsigned long flags;
 
+	if (can_dropped_invalid_skb(ndev, skb))
+		return NETDEV_TX_OK;
+
 	spin_lock_irqsave(&mod->lock, flags);
 
 	/* check that we can actually transmit */
-- 
1.7.10

[PATCH 5/9] can: janz-ican3: cleanup of ican3_to_can_frame and can_frame_to_ican3

[Marc Kleine-Budde]

This patch cleans up the ICAN3 to Linux CAN frame and vice versa
conversion functions:

- RX: Use get_can_dlc() to limit the dlc value.
- RX+TX: Don't copy the whole frame, only copy the amount of bytes
  specified in cf->can_dlc.

Cc: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 754b803..b19aca5 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -811,10 +811,10 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
 
 		cf->can_id |= desc->data[0] << 3;
 		cf->can_id |= (desc->data[1] & 0xe0) >> 5;
-		cf->can_dlc = desc->data[1] & ICAN3_CAN_DLC_MASK;
-		memcpy(cf->data, &desc->data[2], sizeof(cf->data));
+		cf->can_dlc = get_can_dlc(desc->data[1] & ICAN3_CAN_DLC_MASK);
+		memcpy(cf->data, &desc->data[2], cf->can_dlc);
 	} else {
-		cf->can_dlc = desc->data[0] & ICAN3_CAN_DLC_MASK;
+		cf->can_dlc = get_can_dlc(desc->data[0] & ICAN3_CAN_DLC_MASK);
 		if (desc->data[0] & ICAN3_EFF_RTR)
 			cf->can_id |= CAN_RTR_FLAG;
 
@@ -829,7 +829,7 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
 			cf->can_id |= desc->data[3] >> 5;  /* 2-0   */
 		}
 
-		memcpy(cf->data, &desc->data[6], sizeof(cf->data));
+		memcpy(cf->data, &desc->data[6], cf->can_dlc);
 	}
 }
 
@@ -861,7 +861,7 @@ static void can_frame_to_ican3(struct ican3_dev *mod,
 	}
 
 	/* copy the data bits into the descriptor */
-	memcpy(&desc->data[6], cf->data, sizeof(cf->data));
+	memcpy(&desc->data[6], cf->data, cf->can_dlc);
 }
 
 /*
-- 
1.7.10

Re: [PATCH 5/9] can: janz-ican3: cleanup of ican3_to_can_frame and can_frame_to_ican3

[Ira W. Snyder]

On Fri, Jul 20, 2012 at 01:11:45PM +0200, Marc Kleine-Budde wrote:
> This patch cleans up the ICAN3 to Linux CAN frame and vice versa
> conversion functions:
> 
> - RX: Use get_can_dlc() to limit the dlc value.
> - RX+TX: Don't copy the whole frame, only copy the amount of bytes
>   specified in cf->can_dlc.
> 
> Cc: Ira W. Snyder <iws@ovro.caltech.edu>
> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> ---

It looks good to me, and works perfectly.

Acked-by: Ira W. Snyder <iws@ovro.caltech.edu>
Tested-by: Ira W. Snyder <iws@ovro.caltech.edu>

>  drivers/net/can/janz-ican3.c |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
> index 754b803..b19aca5 100644
> --- a/drivers/net/can/janz-ican3.c
> +++ b/drivers/net/can/janz-ican3.c
> @@ -811,10 +811,10 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
>  
>  		cf->can_id |= desc->data[0] << 3;
>  		cf->can_id |= (desc->data[1] & 0xe0) >> 5;
> -		cf->can_dlc = desc->data[1] & ICAN3_CAN_DLC_MASK;
> -		memcpy(cf->data, &desc->data[2], sizeof(cf->data));
> +		cf->can_dlc = get_can_dlc(desc->data[1] & ICAN3_CAN_DLC_MASK);
> +		memcpy(cf->data, &desc->data[2], cf->can_dlc);
>  	} else {
> -		cf->can_dlc = desc->data[0] & ICAN3_CAN_DLC_MASK;
> +		cf->can_dlc = get_can_dlc(desc->data[0] & ICAN3_CAN_DLC_MASK);
>  		if (desc->data[0] & ICAN3_EFF_RTR)
>  			cf->can_id |= CAN_RTR_FLAG;
>  
> @@ -829,7 +829,7 @@ static void ican3_to_can_frame(struct ican3_dev *mod,
>  			cf->can_id |= desc->data[3] >> 5;  /* 2-0   */
>  		}
>  
> -		memcpy(cf->data, &desc->data[6], sizeof(cf->data));
> +		memcpy(cf->data, &desc->data[6], cf->can_dlc);
>  	}
>  }
>  
> @@ -861,7 +861,7 @@ static void can_frame_to_ican3(struct ican3_dev *mod,
>  	}
>  
>  	/* copy the data bits into the descriptor */
> -	memcpy(&desc->data[6], cf->data, sizeof(cf->data));
> +	memcpy(&desc->data[6], cf->data, cf->can_dlc);
>  }
>  
>  /*
> -- 
> 1.7.10
> 
> --
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[PATCH 6/9] can: janz-ican3: fix error and byte counters

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

The error and byte counter statistics were being incremented
incorrectly. For example, a TX error would be counted both in tx_errors
and rx_errors.

This corrects the problem so that tx_errors and rx_errors are only
incremented for errors caused by packets sent to the bus. Error packets
generated by the driver are not counted.

The byte counters are only increased for packets which are actually
transmitted or received from the bus. Error packets generated by the
driver are not counted.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index b19aca5..4a5a8fb 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -907,8 +907,8 @@ static void ican3_handle_msglost(struct ican3_dev *mod, struct ican3_msg *msg)
 	if (skb) {
 		cf->can_id |= CAN_ERR_CRTL;
 		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
+		stats->rx_over_errors++;
 		stats->rx_errors++;
-		stats->rx_bytes += cf->can_dlc;
 		netif_rx(skb);
 	}
 }
@@ -982,7 +982,6 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 
 		dev_dbg(mod->dev, "bus error interrupt\n");
 		mod->can.can_stats.bus_error++;
-		stats->rx_errors++;
 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 
 		switch (ecc & ECC_MASK) {
@@ -1001,8 +1000,12 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 			break;
 		}
 
-		if ((ecc & ECC_DIR) == 0)
+		if (!(ecc & ECC_DIR)) {
 			cf->data[2] |= CAN_ERR_PROT_TX;
+			stats->tx_errors++;
+		} else {
+			stats->rx_errors++;
+		}
 
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
@@ -1028,8 +1031,6 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 	}
 
 	mod->can.state = state;
-	stats->rx_errors++;
-	stats->rx_bytes += cf->can_dlc;
 	netif_rx(skb);
 	return 0;
 }
-- 
1.7.10

[PATCH 7/9] can: janz-ican3: fix support for CAN_RAW_RECV_OWN_MSGS

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

The Janz VMOD-ICAN3 firmware does not support any sort of TX-done
notification or interrupt. The driver previously used the hardware
loopback to attempt to work around this deficiency, but this caused all
sockets to receive all messages, even if CAN_RAW_RECV_OWN_MSGS is off.

Using the new function ican3_cmp_echo_skb(), we can drop the loopback
messages and return the original skbs. This fixes the issues with
CAN_RAW_RECV_OWN_MSGS.

A private skb queue is used to store the echo skbs. This avoids the need
for any index management.

Due to a lack of TX-error interrupts, bus errors are permanently
enabled, and are used as a TX-error notification. This is used to drop
an echo skb when transmission fails. Bus error packets are not generated
if the user has not enabled bus error reporting.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |  203 ++++++++++++++++++++++++++++++++----------
 1 file changed, 157 insertions(+), 46 deletions(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 4a5a8fb..47f8f6b 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -220,6 +220,9 @@ struct ican3_dev {
 	/* old and new style host interface */
 	unsigned int iftype;
 
+	/* queue for echo packets */
+	struct sk_buff_head echoq;
+
 	/*
 	 * Any function which changes the current DPM page must hold this
 	 * lock while it is performing data accesses. This ensures that the
@@ -925,7 +928,7 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 	struct net_device *dev = mod->ndev;
 	struct net_device_stats *stats = &dev->stats;
 	enum can_state state = mod->can.state;
-	u8 status, isrc, rxerr, txerr;
+	u8 isrc, ecc, status, rxerr, txerr;
 	struct can_frame *cf;
 	struct sk_buff *skb;
 
@@ -941,15 +944,43 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 		return -EINVAL;
 	}
 
-	skb = alloc_can_err_skb(dev, &cf);
-	if (skb == NULL)
-		return -ENOMEM;
-
 	isrc = msg->data[0];
+	ecc = msg->data[2];
 	status = msg->data[3];
 	rxerr = msg->data[4];
 	txerr = msg->data[5];
 
+	/*
+	 * This hardware lacks any support other than bus error messages to
+	 * determine if packet transmission has failed.
+	 *
+	 * When TX errors happen, one echo skb needs to be dropped from the
+	 * front of the queue.
+	 *
+	 * A small bit of code is duplicated here and below, to avoid error
+	 * skb allocation when it will just be freed immediately.
+	 */
+	if (isrc == CEVTIND_BEI) {
+		int ret;
+		dev_dbg(mod->dev, "bus error interrupt\n");
+
+		/* TX error */
+		if (!(ecc & ECC_DIR)) {
+			kfree_skb(skb_dequeue(&mod->echoq));
+			stats->tx_errors++;
+		} else {
+			stats->rx_errors++;
+		}
+
+		/* bus error reporting is off, return immediately */
+		if (!(mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
+			return 0;
+	}
+
+	skb = alloc_can_err_skb(dev, &cf);
+	if (skb == NULL)
+		return -ENOMEM;
+
 	/* data overrun interrupt */
 	if (isrc == CEVTIND_DOI || isrc == CEVTIND_LOST) {
 		dev_dbg(mod->dev, "data overrun interrupt\n");
@@ -978,9 +1009,6 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 
 	/* bus error interrupt */
 	if (isrc == CEVTIND_BEI) {
-		u8 ecc = msg->data[2];
-
-		dev_dbg(mod->dev, "bus error interrupt\n");
 		mod->can.can_stats.bus_error++;
 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 
@@ -1000,12 +1028,8 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 			break;
 		}
 
-		if (!(ecc & ECC_DIR)) {
+		if (!(ecc & ECC_DIR))
 			cf->data[2] |= CAN_ERR_PROT_TX;
-			stats->tx_errors++;
-		} else {
-			stats->rx_errors++;
-		}
 
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
@@ -1090,6 +1114,88 @@ static void ican3_handle_message(struct ican3_dev *mod, struct ican3_msg *msg)
 }
 
 /*
+ * The ican3 needs to store all echo skbs, and therefore cannot
+ * use the generic infrastructure for this.
+ */
+static void ican3_put_echo_skb(struct ican3_dev *mod, struct sk_buff *skb)
+{
+	struct sock *srcsk = skb->sk;
+
+	if (atomic_read(&skb->users) != 1) {
+		struct sk_buff *old_skb = skb;
+
+		skb = skb_clone(old_skb, GFP_ATOMIC);
+		kfree_skb(old_skb);
+		if (!skb)
+			return;
+	} else {
+		skb_orphan(skb);
+	}
+
+	skb->sk = srcsk;
+
+	/* save this skb for tx interrupt echo handling */
+	skb_queue_tail(&mod->echoq, skb);
+}
+
+static unsigned int ican3_get_echo_skb(struct ican3_dev *mod)
+{
+	struct sk_buff *skb = skb_dequeue(&mod->echoq);
+	struct can_frame *cf;
+	u8 dlc;
+
+	/* this should never trigger unless there is a driver bug */
+	if (!skb) {
+		netdev_err(mod->ndev, "BUG: echo skb not occupied\n");
+		return 0;
+	}
+
+	cf = (struct can_frame *)skb->data;
+	dlc = cf->can_dlc;
+
+	/* check flag whether this packet has to be looped back */
+	if (skb->pkt_type != PACKET_LOOPBACK) {
+		kfree_skb(skb);
+		return dlc;
+	}
+
+	skb->protocol = htons(ETH_P_CAN);
+	skb->pkt_type = PACKET_BROADCAST;
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+	skb->dev = mod->ndev;
+	netif_receive_skb(skb);
+	return dlc;
+}
+
+/*
+ * Compare an skb with an existing echo skb
+ *
+ * This function will be used on devices which have a hardware loopback.
+ * On these devices, this function can be used to compare a received skb
+ * with the saved echo skbs so that the hardware echo skb can be dropped.
+ *
+ * Returns true if the skb's are identical, false otherwise.
+ */
+static bool ican3_echo_skb_matches(struct ican3_dev *mod, struct sk_buff *skb)
+{
+	struct can_frame *cf = (struct can_frame *)skb->data;
+	struct sk_buff *echo_skb = skb_peek(&mod->echoq);
+	struct can_frame *echo_cf;
+
+	if (!echo_skb)
+		return false;
+
+	echo_cf = (struct can_frame *)echo_skb->data;
+	if (cf->can_id != echo_cf->can_id)
+		return false;
+
+	if (cf->can_dlc != echo_cf->can_dlc)
+		return false;
+
+	return memcmp(cf->data, echo_cf->data, cf->can_dlc) == 0;
+}
+
+/*
  * Check that there is room in the TX ring to transmit another skb
  *
  * LOCKING: must hold mod->lock
@@ -1099,6 +1205,10 @@ static bool ican3_txok(struct ican3_dev *mod)
 	struct ican3_fast_desc __iomem *desc;
 	u8 control;
 
+	/* check that we have echo queue space */
+	if (skb_queue_len(&mod->echoq) >= ICAN3_TX_BUFFERS)
+		return false;
+
 	/* copy the control bits of the descriptor */
 	ican3_set_page(mod, mod->fasttx_start + (mod->fasttx_num / 16));
 	desc = mod->dpm + ((mod->fasttx_num % 16) * sizeof(*desc));
@@ -1149,10 +1259,27 @@ static int ican3_recv_skb(struct ican3_dev *mod)
 	/* convert the ICAN3 frame into Linux CAN format */
 	ican3_to_can_frame(mod, &desc, cf);
 
-	/* receive the skb, update statistics */
-	netif_receive_skb(skb);
+	/*
+	 * If this is an ECHO frame received from the hardware loopback
+	 * feature, use the skb saved in the ECHO stack instead. This allows
+	 * the Linux CAN core to support CAN_RAW_RECV_OWN_MSGS correctly.
+	 *
+	 * Since this is a confirmation of a successfully transmitted packet
+	 * sent from this host, update the transmit statistics.
+	 *
+	 * Also, the netdevice queue needs to be allowed to send packets again.
+	 */
+	if (ican3_echo_skb_matches(mod, skb)) {
+		stats->tx_packets++;
+		stats->tx_bytes += ican3_get_echo_skb(mod);
+		kfree_skb(skb);
+		goto err_noalloc;
+	}
+
+	/* update statistics, receive the skb */
 	stats->rx_packets++;
 	stats->rx_bytes += cf->can_dlc;
+	netif_receive_skb(skb);
 
 err_noalloc:
 	/* toggle the valid bit and return the descriptor to the ring */
@@ -1175,13 +1302,13 @@ err_noalloc:
 static int ican3_napi(struct napi_struct *napi, int budget)
 {
 	struct ican3_dev *mod = container_of(napi, struct ican3_dev, napi);
-	struct ican3_msg msg;
 	unsigned long flags;
 	int received = 0;
 	int ret;
 
 	/* process all communication messages */
 	while (true) {
+		struct ican3_msg msg;
 		ret = ican3_recv_msg(mod, &msg);
 		if (ret)
 			break;
@@ -1353,7 +1480,6 @@ static int __devinit ican3_startup_module(struct ican3_dev *mod)
 static int ican3_open(struct net_device *ndev)
 {
 	struct ican3_dev *mod = netdev_priv(ndev);
-	u8 quota;
 	int ret;
 
 	/* open the CAN layer */
@@ -1363,19 +1489,6 @@ static int ican3_open(struct net_device *ndev)
 		return ret;
 	}
 
-	/* set the bus error generation state appropriately */
-	if (mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
-		quota = ICAN3_BUSERR_QUOTA_MAX;
-	else
-		quota = 0;
-
-	ret = ican3_set_buserror(mod, quota);
-	if (ret) {
-		dev_err(mod->dev, "unable to set bus-error\n");
-		close_candev(ndev);
-		return ret;
-	}
-
 	/* bring the bus online */
 	ret = ican3_set_bus_state(mod, true);
 	if (ret) {
@@ -1407,6 +1520,9 @@ static int ican3_stop(struct net_device *ndev)
 		return ret;
 	}
 
+	/* drop all outstanding echo skbs */
+	skb_queue_purge(&mod->echoq);
+
 	/* close the CAN layer */
 	close_candev(ndev);
 	return 0;
@@ -1415,7 +1531,6 @@ static int ican3_stop(struct net_device *ndev)
 static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
 {
 	struct ican3_dev *mod = netdev_priv(ndev);
-	struct net_device_stats *stats = &ndev->stats;
 	struct can_frame *cf = (struct can_frame *)skb->data;
 	struct ican3_fast_desc desc;
 	void __iomem *desc_addr;
@@ -1428,8 +1543,7 @@ static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
 
 	/* check that we can actually transmit */
 	if (!ican3_txok(mod)) {
-		dev_err(mod->dev, "no free descriptors, stopping queue\n");
-		netif_stop_queue(ndev);
+		dev_err(mod->dev, "BUG: no free descriptors\n");
 		spin_unlock_irqrestore(&mod->lock, flags);
 		return NETDEV_TX_BUSY;
 	}
@@ -1444,6 +1558,14 @@ static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
 	can_frame_to_ican3(mod, cf, &desc);
 
 	/*
+	 * This hardware doesn't have TX-done notifications, so we'll try and
+	 * emulate it the best we can using ECHO skbs. Add the skb to the ECHO
+	 * stack. Upon packet reception, check if the ECHO skb and received
+	 * skb match, and use that to wake the queue.
+	 */
+	ican3_put_echo_skb(mod, skb);
+
+	/*
 	 * the programming manual says that you must set the IVALID bit, then
 	 * interrupt, then set the valid bit. Quite weird, but it seems to be
 	 * required for this to work
@@ -1461,19 +1583,7 @@ static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
 	mod->fasttx_num = (desc.control & DESC_WRAP) ? 0
 						     : (mod->fasttx_num + 1);
 
-	/* update statistics */
-	stats->tx_packets++;
-	stats->tx_bytes += cf->can_dlc;
-	kfree_skb(skb);
-
-	/*
-	 * This hardware doesn't have TX-done notifications, so we'll try and
-	 * emulate it the best we can using ECHO skbs. Get the next TX
-	 * descriptor, and see if we have room to send. If not, stop the queue.
-	 * It will be woken when the ECHO skb for the current packet is recv'd.
-	 */
-
-	/* copy the control bits of the descriptor */
+	/* if there is no free descriptor space, stop the transmit queue */
 	if (!ican3_txok(mod))
 		netif_stop_queue(ndev);
 
@@ -1669,6 +1779,7 @@ static int __devinit ican3_probe(struct platform_device *pdev)
 	mod->dev = &pdev->dev;
 	mod->num = pdata->modno;
 	netif_napi_add(ndev, &mod->napi, ican3_napi, ICAN3_RX_BUFFERS);
+	skb_queue_head_init(&mod->echoq);
 	spin_lock_init(&mod->lock);
 	init_completion(&mod->termination_comp);
 	init_completion(&mod->buserror_comp);
-- 
1.7.10

[PATCH 8/9] can: janz-ican3: avoid firmware lockup caused by infinite bus error quota

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

If the bus error quota is set to infinite and the host CPU cannot keep
up, the Janz VMOD-ICAN3 firmware will stop responding to control
messages until the controller is reset.

The firmware will automatically stop sending bus error messages when the
quota is reached, and will only resume sending bus error messages when
the quota is re-set to a positive value.

This limitation is worked around by setting the bus error quota to one
message, and then re-setting the quota to one message every time a bus
error message is received. By doing this, the firmware never stops
responding to control messages. The CAN bus can be reset without a
hard-reset of the controller card.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 47f8f6b..e06ec40 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -972,6 +972,16 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 			stats->rx_errors++;
 		}
 
+		/*
+		 * The controller automatically disables bus-error interrupts
+		 * and therefore we must re-enable them.
+		 */
+		ret = ican3_set_buserror(mod, 1);
+		if (ret) {
+			dev_err(mod->dev, "unable to re-enable bus-error\n");
+			return ret;
+		}
+
 		/* bus error reporting is off, return immediately */
 		if (!(mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
 			return 0;
@@ -1451,7 +1461,7 @@ static int __devinit ican3_startup_module(struct ican3_dev *mod)
 	}
 
 	/* default to "bus errors enabled" */
-	ret = ican3_set_buserror(mod, ICAN3_BUSERR_QUOTA_MAX);
+	ret = ican3_set_buserror(mod, 1);
 	if (ret) {
 		dev_err(mod->dev, "unable to set bus-error\n");
 		return ret;
-- 
1.7.10

[PATCH 9/9] can: janz-ican3: add support for one shot mode

[Marc Kleine-Budde]

From: "Ira W. Snyder" <iws@ovro.caltech.edu>

The Janz VMOD-ICAN3 hardware has support for one shot packet
transmission. This means that a packet will be attempted to be sent
once, with no automatic retries.

The SocketCAN core has a controller-wide setting for this mode:
CAN_CTRLMODE_ONE_SHOT. The Janz VMOD-ICAN3 hardware supports this flag
on a per-packet level, but the SocketCAN core does not.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/janz-ican3.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index e06ec40..98ee438 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -116,6 +116,7 @@
 #define ICAN3_BUSERR_QUOTA_MAX	255
 
 /* Janz ICAN3 CAN Frame Conversion */
+#define ICAN3_SNGL	0x02
 #define ICAN3_ECHO	0x10
 #define ICAN3_EFF_RTR	0x40
 #define ICAN3_SFF_RTR	0x10
@@ -848,6 +849,10 @@ static void can_frame_to_ican3(struct ican3_dev *mod,
 	desc->data[0] |= cf->can_dlc;
 	desc->data[1] |= ICAN3_ECHO;
 
+	/* support single transmission (no retries) mode */
+	if (mod->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+		desc->data[1] |= ICAN3_SNGL;
+
 	if (cf->can_id & CAN_RTR_FLAG)
 		desc->data[0] |= ICAN3_EFF_RTR;
 
@@ -1810,7 +1815,8 @@ static int __devinit ican3_probe(struct platform_device *pdev)
 	mod->can.do_set_mode = ican3_set_mode;
 	mod->can.do_get_berr_counter = ican3_get_berr_counter;
 	mod->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES
-				    | CAN_CTRLMODE_BERR_REPORTING;
+				    | CAN_CTRLMODE_BERR_REPORTING
+				    | CAN_CTRLMODE_ONE_SHOT;
 
 	/* find our IRQ number */
 	mod->irq = platform_get_irq(pdev, 0);
-- 
1.7.10

Re: [PATCH 0/9] upcoming pull request: const annoations + flexcan + janz-ican3 update

[Marc Kleine-Budde]

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On 07/20/2012 01:11 PM, Marc Kleine-Budde wrote:
> Hello,
> 
> this is my upcoming pull request to David. Ira, I had a trivial conflict
> while merging your patches. Further I improved the ican3_to_can_frame and
> can_frame_to_ican3 functions. The helper "get_can_dlc()" is to limit the
> dlc value coming from the controller, further only dlc bytes are copied
> from and to the controller, not the whole frame. (see patch 5/9).
> 
> This pull request will also contain the flexcan update for imx53 and the
> bittiming_const annotation posted earlier this week.
> 
> Pleae review and test.
> Feel free to send Acked-by, Tested-by, Reviewed-by etc :)

These patches can be found in linux-can-next repo in the for-davem branch:

    git://gitorious.org/linux-can/linux-can-next.git for-davem

regards, Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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