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linux-can-fixes-for-4.5-20160221 

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Merge tag 'linux-can-fixes-for-4.5-20160221' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2016-02-21

this is a pull reqeust of one patch for net/master.

The patch is by Gerhard Uttenthaler and fixes a potential tx overflow in the
ems_usb driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-02-21 22:51:55 -05:00
parent dd78dac893 90cfde4658
commit d856626d3b
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/can/usb/ems_usb.c
View File

@ -117,6 +117,9 @@ MODULE_LICENSE("GPL v2");
*/
#define EMS_USB_ARM7_CLOCK 8000000
#define CPC_TX_QUEUE_TRIGGER_LOW 25
#define CPC_TX_QUEUE_TRIGGER_HIGH 35
/*
* CAN-Message representation in a CPC_MSG. Message object type is
* CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or
@ -278,6 +281,11 @@ static void ems_usb_read_interrupt_callback(struct urb *urb)
switch (urb->status) {
case 0:
dev->free_slots = dev->intr_in_buffer[1];
if(dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH){
if (netif_queue_stopped(netdev)){
netif_wake_queue(netdev);
}
}
break;
case -ECONNRESET: /* unlink */
@ -526,8 +534,6 @@ static void ems_usb_write_bulk_callback(struct urb *urb)
/* Release context */
context->echo_index = MAX_TX_URBS;
if (netif_queue_stopped(netdev))
netif_wake_queue(netdev);
}
/*
@ -587,7 +593,7 @@ static int ems_usb_start(struct ems_usb *dev)
int err, i;
dev->intr_in_buffer[0] = 0;
dev->free_slots = 15; /* initial size */
dev->free_slots = 50; /* initial size */
for (i = 0; i < MAX_RX_URBS; i++) {
struct urb *urb = NULL;
@ -835,7 +841,7 @@ static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *ne
/* Slow down tx path */
if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
dev->free_slots < 5) {
dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) {
netif_stop_queue(netdev);
}
}