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can: gs_usb: convert from usb_control_msg() to usb_control_msg_{send,recv}()

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Convert the driver to use usb_control_msg_{send,recv}() instead of
usb_control_msg(). These functions allow the data to be placed on the
stack. This makes the driver a lot easier as we don't have to deal
with dynamically allocated memory.

Link: https://lore.kernel.org/all/20220921193902.575416-3-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde
2022-09-18 22:42:59 +02:00
parent 0024675186
commit 3814ed2754
1 changed files with 107 additions and 194 deletions
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301
drivers/net/can/usb/gs_usb.c
View File

@ -360,25 +360,15 @@ static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
static int gs_cmd_reset(struct gs_can *dev)
{
struct gs_device_mode *dm;
struct usb_interface *intf = dev->iface;
int rc;
struct gs_device_mode dm = {
.mode = GS_CAN_MODE_RESET,
};
dm = kzalloc(sizeof(*dm), GFP_KERNEL);
if (!dm)
return -ENOMEM;
dm->mode = GS_CAN_MODE_RESET;
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, dm, sizeof(*dm), 1000);
kfree(dm);
return rc;
return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, &dm, sizeof(dm), 1000,
GFP_KERNEL);
}
static inline int gs_usb_get_timestamp(const struct gs_can *dev,
@ -656,72 +646,44 @@ static int gs_usb_set_bittiming(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct can_bittiming *bt = &dev->can.bittiming;
struct usb_interface *intf = dev->iface;
int rc;
struct gs_device_bittiming *dbt;
dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
if (!dbt)
return -ENOMEM;
dbt->prop_seg = cpu_to_le32(bt->prop_seg);
dbt->phase_seg1 = cpu_to_le32(bt->phase_seg1);
dbt->phase_seg2 = cpu_to_le32(bt->phase_seg2);
dbt->sjw = cpu_to_le32(bt->sjw);
dbt->brp = cpu_to_le32(bt->brp);
struct gs_device_bittiming dbt = {
.prop_seg = cpu_to_le32(bt->prop_seg),
.phase_seg1 = cpu_to_le32(bt->phase_seg1),
.phase_seg2 = cpu_to_le32(bt->phase_seg2),
.sjw = cpu_to_le32(bt->sjw),
.brp = cpu_to_le32(bt->brp),
};
/* request bit timings */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BITTIMING,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, dbt, sizeof(*dbt), 1000);
kfree(dbt);
if (rc < 0)
dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
rc);
return (rc > 0) ? 0 : rc;
return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
GS_USB_BREQ_BITTIMING,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, &dbt, sizeof(dbt), 1000,
GFP_KERNEL);
}
static int gs_usb_set_data_bittiming(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct can_bittiming *bt = &dev->can.data_bittiming;
struct usb_interface *intf = dev->iface;
struct gs_device_bittiming *dbt;
struct gs_device_bittiming dbt = {
.prop_seg = cpu_to_le32(bt->prop_seg),
.phase_seg1 = cpu_to_le32(bt->phase_seg1),
.phase_seg2 = cpu_to_le32(bt->phase_seg2),
.sjw = cpu_to_le32(bt->sjw),
.brp = cpu_to_le32(bt->brp),
};
u8 request = GS_USB_BREQ_DATA_BITTIMING;
int rc;
dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
if (!dbt)
return -ENOMEM;
dbt->prop_seg = cpu_to_le32(bt->prop_seg);
dbt->phase_seg1 = cpu_to_le32(bt->phase_seg1);
dbt->phase_seg2 = cpu_to_le32(bt->phase_seg2);
dbt->sjw = cpu_to_le32(bt->sjw);
dbt->brp = cpu_to_le32(bt->brp);
if (dev->feature & GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO)
request = GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING;
/* request bit timings */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_sndctrlpipe(interface_to_usbdev(intf), 0),
request,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, dbt, sizeof(*dbt), 1000);
kfree(dbt);
if (rc < 0)
dev_err(netdev->dev.parent,
"Couldn't set data bittimings (err=%d)", rc);
return (rc > 0) ? 0 : rc;
/* request data bit timings */
return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
request,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, &dbt, sizeof(dbt), 1000,
GFP_KERNEL);
}
static void gs_usb_xmit_callback(struct urb *urb)
@ -860,11 +822,13 @@ static int gs_can_open(struct net_device *netdev)
{
struct gs_can *dev = netdev_priv(netdev);
struct gs_usb *parent = dev->parent;
int rc, i;
struct gs_device_mode *dm;
struct gs_device_mode dm = {
.mode = cpu_to_le32(GS_CAN_MODE_START),
};
struct gs_host_frame *hf;
u32 ctrlmode;
u32 flags = 0;
int rc, i;
rc = open_candev(netdev);
if (rc)
@ -949,10 +913,6 @@ static int gs_can_open(struct net_device *netdev)
}
}
dm = kmalloc(sizeof(*dm), GFP_KERNEL);
if (!dm)
return -ENOMEM;
/* flags */
if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
flags |= GS_CAN_MODE_LOOP_BACK;
@ -978,25 +938,20 @@ static int gs_can_open(struct net_device *netdev)
/* 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),
usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, dm, sizeof(*dm), 1000);
if (rc < 0) {
dm.flags = cpu_to_le32(flags);
rc = usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
GS_USB_BREQ_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, &dm, sizeof(dm), 1000,
GFP_KERNEL);
if (rc) {
netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
kfree(dm);
if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
gs_usb_timestamp_stop(dev);
dev->can.state = CAN_STATE_STOPPED;
return rc;
}
kfree(dm);
parent->active_channels++;
if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
netif_start_queue(netdev);
@ -1070,28 +1025,18 @@ static const struct net_device_ops gs_usb_netdev_ops = {
static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
{
struct gs_can *dev = netdev_priv(netdev);
struct gs_identify_mode *imode;
int rc;
imode = kmalloc(sizeof(*imode), GFP_KERNEL);
if (!imode)
return -ENOMEM;
struct gs_identify_mode imode;
if (do_identify)
imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
else
imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
rc = usb_control_msg(interface_to_usbdev(dev->iface),
usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
GS_USB_BREQ_IDENTIFY,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, imode, sizeof(*imode), 100);
kfree(imode);
return (rc > 0) ? 0 : rc;
return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
GS_USB_BREQ_IDENTIFY,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
dev->channel, 0, &imode, sizeof(imode), 100,
GFP_KERNEL);
}
/* blink LED's for finding the this interface */
@ -1142,26 +1087,21 @@ static struct gs_can *gs_make_candev(unsigned int channel,
struct gs_can *dev;
struct net_device *netdev;
int rc;
struct gs_device_bt_const *bt_const;
struct gs_device_bt_const_extended *bt_const_extended;
struct gs_device_bt_const_extended bt_const_extended;
struct gs_device_bt_const bt_const;
u32 feature;
bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
if (!bt_const)
return ERR_PTR(-ENOMEM);
/* fetch bit timing constants */
rc = usb_control_msg(interface_to_usbdev(intf),
usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BT_CONST,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel, 0, bt_const, sizeof(*bt_const), 1000);
rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
GS_USB_BREQ_BT_CONST,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel, 0, &bt_const, sizeof(bt_const), 1000,
GFP_KERNEL);
if (rc < 0) {
if (rc) {
dev_err(&intf->dev,
"Couldn't get bit timing const for channel (err=%d)\n",
rc);
kfree(bt_const);
return ERR_PTR(rc);
}
@ -1169,7 +1109,6 @@ static struct gs_can *gs_make_candev(unsigned int channel,
netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
if (!netdev) {
dev_err(&intf->dev, "Couldn't allocate candev\n");
kfree(bt_const);
return ERR_PTR(-ENOMEM);
}
@ -1182,14 +1121,14 @@ static struct gs_can *gs_make_candev(unsigned int channel,
/* dev setup */
strcpy(dev->bt_const.name, KBUILD_MODNAME);
dev->bt_const.tseg1_min = le32_to_cpu(bt_const->tseg1_min);
dev->bt_const.tseg1_max = le32_to_cpu(bt_const->tseg1_max);
dev->bt_const.tseg2_min = le32_to_cpu(bt_const->tseg2_min);
dev->bt_const.tseg2_max = le32_to_cpu(bt_const->tseg2_max);
dev->bt_const.sjw_max = le32_to_cpu(bt_const->sjw_max);
dev->bt_const.brp_min = le32_to_cpu(bt_const->brp_min);
dev->bt_const.brp_max = le32_to_cpu(bt_const->brp_max);
dev->bt_const.brp_inc = le32_to_cpu(bt_const->brp_inc);
dev->bt_const.tseg1_min = le32_to_cpu(bt_const.tseg1_min);
dev->bt_const.tseg1_max = le32_to_cpu(bt_const.tseg1_max);
dev->bt_const.tseg2_min = le32_to_cpu(bt_const.tseg2_min);
dev->bt_const.tseg2_max = le32_to_cpu(bt_const.tseg2_max);
dev->bt_const.sjw_max = le32_to_cpu(bt_const.sjw_max);
dev->bt_const.brp_min = le32_to_cpu(bt_const.brp_min);
dev->bt_const.brp_max = le32_to_cpu(bt_const.brp_max);
dev->bt_const.brp_inc = le32_to_cpu(bt_const.brp_inc);
dev->udev = interface_to_usbdev(intf);
dev->iface = intf;
@ -1206,13 +1145,13 @@ static struct gs_can *gs_make_candev(unsigned int channel,
/* can setup */
dev->can.state = CAN_STATE_STOPPED;
dev->can.clock.freq = le32_to_cpu(bt_const->fclk_can);
dev->can.clock.freq = le32_to_cpu(bt_const.fclk_can);
dev->can.bittiming_const = &dev->bt_const;
dev->can.do_set_bittiming = gs_usb_set_bittiming;
dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
feature = le32_to_cpu(bt_const->feature);
feature = le32_to_cpu(bt_const.feature);
dev->feature = FIELD_GET(GS_CAN_FEATURE_MASK, feature);
if (feature & GS_CAN_FEATURE_LISTEN_ONLY)
dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
@ -1263,45 +1202,35 @@ static struct gs_can *gs_make_candev(unsigned int channel,
feature & GS_CAN_FEATURE_IDENTIFY))
dev->feature &= ~GS_CAN_FEATURE_IDENTIFY;
kfree(bt_const);
/* fetch extended bit timing constants if device has feature
* GS_CAN_FEATURE_FD and GS_CAN_FEATURE_BT_CONST_EXT
*/
if (feature & GS_CAN_FEATURE_FD &&
feature & GS_CAN_FEATURE_BT_CONST_EXT) {
bt_const_extended = kmalloc(sizeof(*bt_const_extended), GFP_KERNEL);
if (!bt_const_extended)
return ERR_PTR(-ENOMEM);
rc = usb_control_msg(interface_to_usbdev(intf),
usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
GS_USB_BREQ_BT_CONST_EXT,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel, 0, bt_const_extended,
sizeof(*bt_const_extended),
1000);
if (rc < 0) {
rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
GS_USB_BREQ_BT_CONST_EXT,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
channel, 0, &bt_const_extended,
sizeof(bt_const_extended),
1000, GFP_KERNEL);
if (rc) {
dev_err(&intf->dev,
"Couldn't get extended bit timing const for channel (err=%d)\n",
rc);
kfree(bt_const_extended);
return ERR_PTR(rc);
}
strcpy(dev->data_bt_const.name, KBUILD_MODNAME);
dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const_extended->dtseg1_min);
dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const_extended->dtseg1_max);
dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const_extended->dtseg2_min);
dev->data_bt_const.tseg2_max = le32_to_cpu(bt_const_extended->dtseg2_max);
dev->data_bt_const.sjw_max = le32_to_cpu(bt_const_extended->dsjw_max);
dev->data_bt_const.brp_min = le32_to_cpu(bt_const_extended->dbrp_min);
dev->data_bt_const.brp_max = le32_to_cpu(bt_const_extended->dbrp_max);
dev->data_bt_const.brp_inc = le32_to_cpu(bt_const_extended->dbrp_inc);
dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const_extended.dtseg1_min);
dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const_extended.dtseg1_max);
dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const_extended.dtseg2_min);
dev->data_bt_const.tseg2_max = le32_to_cpu(bt_const_extended.dtseg2_max);
dev->data_bt_const.sjw_max = le32_to_cpu(bt_const_extended.dsjw_max);
dev->data_bt_const.brp_min = le32_to_cpu(bt_const_extended.dbrp_min);
dev->data_bt_const.brp_max = le32_to_cpu(bt_const_extended.dbrp_max);
dev->data_bt_const.brp_inc = le32_to_cpu(bt_const_extended.dbrp_inc);
dev->can.data_bittiming_const = &dev->data_bt_const;
kfree(bt_const_extended);
}
SET_NETDEV_DEV(netdev, &intf->dev);
@ -1329,64 +1258,51 @@ static int gs_usb_probe(struct usb_interface *intf,
struct usb_device *udev = interface_to_usbdev(intf);
struct gs_host_frame *hf;
struct gs_usb *dev;
int rc = -ENOMEM;
struct gs_host_config hconf = {
.byte_order = cpu_to_le32(0x0000beef),
};
struct gs_device_config dconf;
unsigned int icount, i;
struct gs_host_config *hconf;
struct gs_device_config *dconf;
hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
if (!hconf)
return -ENOMEM;
hconf->byte_order = cpu_to_le32(0x0000beef);
int rc;
/* send host config */
rc = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
GS_USB_BREQ_HOST_FORMAT,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1, intf->cur_altsetting->desc.bInterfaceNumber,
hconf, sizeof(*hconf), 1000);
kfree(hconf);
if (rc < 0) {
rc = usb_control_msg_send(udev, 0,
GS_USB_BREQ_HOST_FORMAT,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1, intf->cur_altsetting->desc.bInterfaceNumber,
&hconf, sizeof(hconf), 1000,
GFP_KERNEL);
if (rc) {
dev_err(&intf->dev, "Couldn't send data format (err=%d)\n", rc);
return rc;
}
dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
if (!dconf)
return -ENOMEM;
/* read device config */
rc = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
GS_USB_BREQ_DEVICE_CONFIG,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1, intf->cur_altsetting->desc.bInterfaceNumber,
dconf, sizeof(*dconf), 1000);
if (rc < 0) {
rc = usb_control_msg_recv(udev, 0,
GS_USB_BREQ_DEVICE_CONFIG,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1, intf->cur_altsetting->desc.bInterfaceNumber,
&dconf, sizeof(dconf), 1000,
GFP_KERNEL);
if (rc) {
dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
rc);
kfree(dconf);
return rc;
}
icount = dconf->icount + 1;
icount = dconf.icount + 1;
dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
if (icount > GS_MAX_INTF) {
dev_err(&intf->dev,
"Driver cannot handle more that %u CAN interfaces\n",
GS_MAX_INTF);
kfree(dconf);
return -EINVAL;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
kfree(dconf);
if (!dev)
return -ENOMEM;
}
init_usb_anchor(&dev->rx_submitted);
@ -1396,7 +1312,7 @@ static int gs_usb_probe(struct usb_interface *intf,
for (i = 0; i < icount; i++) {
unsigned int hf_size_rx = 0;
dev->canch[i] = gs_make_candev(i, intf, dconf);
dev->canch[i] = gs_make_candev(i, intf, &dconf);
if (IS_ERR_OR_NULL(dev->canch[i])) {
/* save error code to return later */
rc = PTR_ERR(dev->canch[i]);
@ -1407,7 +1323,6 @@ static int gs_usb_probe(struct usb_interface *intf,
gs_destroy_candev(dev->canch[i]);
usb_kill_anchored_urbs(&dev->rx_submitted);
kfree(dconf);
kfree(dev);
return rc;
}
@ -1430,8 +1345,6 @@ static int gs_usb_probe(struct usb_interface *intf,
dev->hf_size_rx = max(dev->hf_size_rx, hf_size_rx);
}
kfree(dconf);
return 0;
}