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linux-can-fixes-for-6.0-20220921

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Merge tag 'linux-can-fixes-for-6.0-20220921' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2022-09-21

The 1st patch is by me, targets the flexcan driver and fixes a
potential system hang on single core systems under high CAN packet
rate.

The next 2 patches are also by me and target the gs_usb driver. A
potential race condition during the ndo_open callback as well as the
return value if the ethtool identify feature is not supported are
fixed.

* tag 'linux-can-fixes-for-6.0-20220921' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  can: gs_usb: gs_usb_set_phys_id(): return with error if identify is not supported
  can: gs_usb: gs_can_open(): fix race dev->can.state condition
  can: flexcan: flexcan_mailbox_read() fix return value for drop = true
====================

Link: https://lore.kernel.org/r/20220921083609.419768-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2022-09-21 06:52:32 -07:00
commit 375a683321
2 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/can/flexcan/flexcan-core.c
View File

@ -941,11 +941,6 @@ static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
u32 reg_ctrl, reg_id, reg_iflag1;
int i;
if (unlikely(drop)) {
skb = ERR_PTR(-ENOBUFS);
goto mark_as_read;
}
mb = flexcan_get_mb(priv, n);
if (priv->devtype_data.quirks & FLEXCAN_QUIRK_USE_RX_MAILBOX) {
@ -974,6 +969,11 @@ static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,
reg_ctrl = priv->read(&mb->can_ctrl);
}
if (unlikely(drop)) {
skb = ERR_PTR(-ENOBUFS);
goto mark_as_read;
}
if (reg_ctrl & FLEXCAN_MB_CNT_EDL)
skb = alloc_canfd_skb(offload->dev, &cfd);
else

21
drivers/net/can/usb/gs_usb.c
View File

@ -824,6 +824,7 @@ static int gs_can_open(struct net_device *netdev)
flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
/* finally start device */
dev->can.state = CAN_STATE_ERROR_ACTIVE;
dm->mode = cpu_to_le32(GS_CAN_MODE_START);
dm->flags = cpu_to_le32(flags);
rc = usb_control_msg(interface_to_usbdev(dev->iface),
@ -835,13 +836,12 @@ static int gs_can_open(struct net_device *netdev)
if (rc < 0) {
netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
kfree(dm);
dev->can.state = CAN_STATE_STOPPED;
return rc;
}
kfree(dm);
dev->can.state = CAN_STATE_ERROR_ACTIVE;
parent->active_channels++;
if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
netif_start_queue(netdev);
@ -925,17 +925,21 @@ static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
}
/* blink LED's for finding the this interface */
static int gs_usb_set_phys_id(struct net_device *dev,
static int gs_usb_set_phys_id(struct net_device *netdev,
enum ethtool_phys_id_state state)
{
const struct gs_can *dev = netdev_priv(netdev);
int rc = 0;
if (!(dev->feature & GS_CAN_FEATURE_IDENTIFY))
return -EOPNOTSUPP;
switch (state) {
case ETHTOOL_ID_ACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_ON);
break;
case ETHTOOL_ID_INACTIVE:
rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_OFF);
break;
default:
break;
@ -1072,9 +1076,10 @@ static struct gs_can *gs_make_candev(unsigned int channel,
dev->feature |= GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX |
GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO;
if (le32_to_cpu(dconf->sw_version) > 1)
if (feature & GS_CAN_FEATURE_IDENTIFY)
netdev->ethtool_ops = &gs_usb_ethtool_ops;
/* GS_CAN_FEATURE_IDENTIFY is only supported for sw_version > 1 */
if (!(le32_to_cpu(dconf->sw_version) > 1 &&
feature & GS_CAN_FEATURE_IDENTIFY))
dev->feature &= ~GS_CAN_FEATURE_IDENTIFY;
kfree(bt_const);