/*
* returns 1 if we get the read lock and 0 if we don't
* this won't wait for blocking writers
*/
int btrfs_try_tree_read_lock(struct extent_buffer *eb)
{
if (atomic_read(&eb->blocking_writers))
return 0;
if (!read_trylock(&eb->lock))
return 0;
if (atomic_read(&eb->blocking_writers)) {
read_unlock(&eb->lock);
return 0;
}
atomic_inc(&eb->read_locks);
atomic_inc(&eb->spinning_readers);
return 1;
}
static void
hxge_work_to_do(struct work_struct *work)
#endif
{
int i;
int channel;
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)
struct hxge_adapter *hxgep = container_of(work, struct hxge_adapter, work_to_do);
#endif
HXGE_ERR(hxgep, "hxge_work_to_do called on cpu %d",smp_processor_id());
if (!read_trylock(&hxgep->wtd_lock)) {
return;
}
for (i = 0; i < MAX_CMD; i++)
if (test_and_clear_bit(i, &hxgep->work_q.command)) {
switch (i) {
case RESET_TX_CHANNEL_0 :
case RESET_TX_CHANNEL_1 :
case RESET_TX_CHANNEL_2 :
case RESET_TX_CHANNEL_3 :
channel = i - RESET_TX_CHANNEL_0;
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting Tx channel %d", channel);
hxge_reset_tx_channel(hxgep, channel);
break;
case RESET_RX_CHANNEL_0 :
case RESET_RX_CHANNEL_1 :
case RESET_RX_CHANNEL_2 :
case RESET_RX_CHANNEL_3 :
channel = i - RESET_RX_CHANNEL_0;
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting Rx channel %d", channel);
hxge_reset_rx_channel(hxgep, channel);
break;
case RESET_ADAPTER:
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting adapter");
hxge_reset_adapter(hxgep);
break;
case RESET_TDC:
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting TDC core");
hxge_reset_tdc(hxgep);
break;
case RESET_RDC:
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting RDC core");
hxge_reset_rdc(hxgep);
break;
case RESET_PFC:
/* For now, just reset the whole hxge */
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting PFC; resetting whole hxge");
hxge_reset_adapter(hxgep);
break;
case RESET_VMAC:
/* For now, just reset the whole hxge */
HXGE_ERR(hxgep, "hxge_work_to_do: Resetting VMAC; resetting whole hxge");
hxge_reset_adapter(hxgep);
break;
case SHUTDOWN_ADAPTER:
HXGE_ERR(hxgep, "hxge_work_to_do: Shutting down adapter");
hxge_shutdown_adapter(hxgep);
break;
default:
HXGE_ERR(hxgep, "hxge_work_to_do: Uh? unknown command");
break;
}
}
read_unlock(&hxgep->wtd_lock);
}
