Merge tag 'linux-can-fixes-for-5.19-20220704' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
can 2022-07-04

The 1st patch is by Oliver Hartkopp, targets the BCM CAN protocol and
converts a costly synchronize_rcu() to call_rcu() to fix a performance
regression.

Srinivas Neeli's patch for the xilinx_can driver drops the brp limit
down to 1, as only the pre-production silicon have an issue with a brp
of 1.

The next patch is by Duy Nguyen and fixes the data transmission on
R-Car V3U SoCs in the rcar_canfd driver.

Rhett Aultman's patch fixes a DMA memory leak in the gs_usb driver.

Liang He's patch removes an extra of_node_get() in the grcan driver.

The next 2 patches are by me, target the m_can driver and fix the
timestamp handling used for peripheral devices like the tcan4x5x.

Jimmy Assarsson contributes 3 patches for the kvaser_usb driver and
fixes CAN clock and bit timing related issues.

The remaining 5 patches target the mcp251xfd driver. Thomas Kopp
contributes 2 patches to improve the workaround for broken CRC when
reading the TBC register. 3 patches by me add a missing
hrtimer_cancel() during the ndo_stop() callback, and fix the reading
of the Device ID register.

* tag 'linux-can-fixes-for-5.19-20220704' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  can: mcp251xfd: mcp251xfd_register_get_dev_id(): fix endianness conversion
  can: mcp251xfd: mcp251xfd_register_get_dev_id(): use correct length to read dev_id
  can: mcp251xfd: mcp251xfd_stop(): add missing hrtimer_cancel()
  can: mcp251xfd: mcp251xfd_regmap_crc_read(): update workaround broken CRC on TBC register
  can: mcp251xfd: mcp251xfd_regmap_crc_read(): improve workaround handling for mcp2517fd
  can: kvaser_usb: kvaser_usb_leaf: fix bittiming limits
  can: kvaser_usb: kvaser_usb_leaf: fix CAN clock frequency regression
  can: kvaser_usb: replace run-time checks with struct kvaser_usb_driver_info
  can: m_can: m_can_{read_fifo,echo_tx_event}(): shift timestamp to full 32 bits
  can: m_can: m_can_chip_config(): actually enable internal timestamping
  can: grcan: grcan_probe(): remove extra of_node_get()
  can: gs_usb: gs_usb_open/close(): fix memory leak
  can: rcar_canfd: Fix data transmission failed on R-Car V3U
  Revert "can: xilinx_can: Limit CANFD brp to 2"
  can: bcm: use call_rcu() instead of costly synchronize_rcu()
====================

Link: https://lore.kernel.org/r/20220704122613.1551119-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index b29ba9138866..d3a658b444b5 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -268,6 +268,8 @@ struct gs_can {
 
 	struct usb_anchor tx_submitted;
 	atomic_t active_tx_urbs;
+	void *rxbuf[GS_MAX_RX_URBS];
+	dma_addr_t rxbuf_dma[GS_MAX_RX_URBS];
 };
 
 /* usb interface struct */
@@ -742,6 +744,7 @@ static int gs_can_open(struct net_device *netdev)
 		for (i = 0; i < GS_MAX_RX_URBS; i++) {
 			struct urb *urb;
 			u8 *buf;
+			dma_addr_t buf_dma;
 
 			/* alloc rx urb */
 			urb = usb_alloc_urb(0, GFP_KERNEL);
@@ -752,7 +755,7 @@ static int gs_can_open(struct net_device *netdev)
 			buf = usb_alloc_coherent(dev->udev,
 						 dev->parent->hf_size_rx,
 						 GFP_KERNEL,
-						 &urb->transfer_dma);
+						 &buf_dma);
 			if (!buf) {
 				netdev_err(netdev,
 					   "No memory left for USB buffer\n");
@@ -760,6 +763,8 @@ static int gs_can_open(struct net_device *netdev)
 				return -ENOMEM;
 			}
 
+			urb->transfer_dma = buf_dma;
+
 			/* fill, anchor, and submit rx urb */
 			usb_fill_bulk_urb(urb,
 					  dev->udev,
@@ -781,10 +786,17 @@ static int gs_can_open(struct net_device *netdev)
 					   "usb_submit failed (err=%d)\n", rc);
 
 				usb_unanchor_urb(urb);
+				usb_free_coherent(dev->udev,
+						  sizeof(struct gs_host_frame),
+						  buf,
+						  buf_dma);
 				usb_free_urb(urb);
 				break;
 			}
 
+			dev->rxbuf[i] = buf;
+			dev->rxbuf_dma[i] = buf_dma;
+
 			/* Drop reference,
 			 * USB core will take care of freeing it
 			 */
@@ -842,13 +854,20 @@ static int gs_can_close(struct net_device *netdev)
 	int rc;
 	struct gs_can *dev = netdev_priv(netdev);
 	struct gs_usb *parent = dev->parent;
+	unsigned int i;
 
 	netif_stop_queue(netdev);
 
 	/* Stop polling */
 	parent->active_channels--;
-	if (!parent->active_channels)
+	if (!parent->active_channels) {
 		usb_kill_anchored_urbs(&parent->rx_submitted);
+		for (i = 0; i < GS_MAX_RX_URBS; i++)
+			usb_free_coherent(dev->udev,
+					  sizeof(struct gs_host_frame),
+					  dev->rxbuf[i],
+					  dev->rxbuf_dma[i]);
+	}
 
 	/* Stop sending URBs */
 	usb_kill_anchored_urbs(&dev->tx_submitted);