cnic: Refactor some code.

Refactor ring init. code for subsequent 10G patches.  Also add rtnl_lock()
in cnic_uio_open() to prevent race condition with netdev events.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 46c87ec..eac68f9 100644 (file)
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -67,9 +67,8 @@ static struct cnic_ops cnic_bnx2_ops = {
        .cnic_ctl       = cnic_ctl,
 };
 
-static void cnic_shutdown_bnx2_rx_ring(struct cnic_dev *);
-static void cnic_init_bnx2_tx_ring(struct cnic_dev *);
-static void cnic_init_bnx2_rx_ring(struct cnic_dev *);
+static void cnic_shutdown_rings(struct cnic_dev *);
+static void cnic_init_rings(struct cnic_dev *);
 static int cnic_cm_set_pg(struct cnic_sock *);
 
 static int cnic_uio_open(struct uio_info *uinfo, struct inode *inode)
@@ -83,10 +82,16 @@ static int cnic_uio_open(struct uio_info *uinfo, struct inode *inode)
        if (cp->uio_dev != -1)
                return -EBUSY;
 
+       rtnl_lock();
+       if (!test_bit(CNIC_F_CNIC_UP, &dev->flags)) {
+               rtnl_unlock();
+               return -ENODEV;
+       }
+
        cp->uio_dev = iminor(inode);
 
-       cnic_init_bnx2_tx_ring(dev);
-       cnic_init_bnx2_rx_ring(dev);
+       cnic_init_rings(dev);
+       rtnl_unlock();
 
        return 0;
 }
@@ -96,7 +101,7 @@ static int cnic_uio_close(struct uio_info *uinfo, struct inode *inode)
        struct cnic_dev *dev = uinfo->priv;
        struct cnic_local *cp = dev->cnic_priv;
 
-       cnic_shutdown_bnx2_rx_ring(dev);
+       cnic_shutdown_rings(dev);
 
        cp->uio_dev = -1;
        return 0;
@@ -675,6 +680,21 @@ error:
        return -ENOMEM;
 }
 
+static void cnic_free_context(struct cnic_dev *dev)
+{
+       struct cnic_local *cp = dev->cnic_priv;
+       int i;
+
+       for (i = 0; i < cp->ctx_blks; i++) {
+               if (cp->ctx_arr[i].ctx) {
+                       pci_free_consistent(dev->pcidev, cp->ctx_blk_size,
+                                           cp->ctx_arr[i].ctx,
+                                           cp->ctx_arr[i].mapping);
+                       cp->ctx_arr[i].ctx = NULL;
+               }
+       }
+}
+
 static void cnic_free_resc(struct cnic_dev *dev)
 {
        struct cnic_local *cp = dev->cnic_priv;
@@ -702,14 +722,7 @@ static void cnic_free_resc(struct cnic_dev *dev)
                cp->l2_ring = NULL;
        }
 
-       for (i = 0; i < cp->ctx_blks; i++) {
-               if (cp->ctx_arr[i].ctx) {
-                       pci_free_consistent(dev->pcidev, cp->ctx_blk_size,
-                                           cp->ctx_arr[i].ctx,
-                                           cp->ctx_arr[i].mapping);
-                       cp->ctx_arr[i].ctx = NULL;
-               }
-       }
+       cnic_free_context(dev);
        kfree(cp->ctx_arr);
        cp->ctx_arr = NULL;
        cp->ctx_blks = 0;
@@ -808,8 +821,8 @@ static int cnic_alloc_uio(struct cnic_dev *dev) {
        uinfo->mem[0].size = dev->netdev->mem_end - dev->netdev->mem_start;
        uinfo->mem[0].memtype = UIO_MEM_PHYS;
 
-       uinfo->mem[1].addr = (unsigned long) cp->status_blk & PAGE_MASK;
        if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
+               uinfo->mem[1].addr = (unsigned long) cp->status_blk & PAGE_MASK;
                if (cp->ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX)
                        uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE * 9;
                else
@@ -1012,7 +1025,7 @@ static int cnic_get_kcqes(struct cnic_dev *dev, u16 hw_prod, u16 *sw_prod)
        return last_cnt;
 }
 
-static void cnic_chk_bnx2_pkt_rings(struct cnic_local *cp)
+static void cnic_chk_pkt_rings(struct cnic_local *cp)
 {
        u16 rx_cons = *cp->rx_cons_ptr;
        u16 tx_cons = *cp->tx_cons_ptr;
@@ -1062,7 +1075,7 @@ done:
 
        cp->kcq_prod_idx = sw_prod;
 
-       cnic_chk_bnx2_pkt_rings(cp);
+       cnic_chk_pkt_rings(cp);
        return status_idx;
 }
 
@@ -1100,7 +1113,7 @@ done:
        CNIC_WR16(dev, cp->kcq_io_addr, sw_prod);
        cp->kcq_prod_idx = sw_prod;
 
-       cnic_chk_bnx2_pkt_rings(cp);
+       cnic_chk_pkt_rings(cp);
 
        cp->last_status_idx = status_idx;
        CNIC_WR(dev, BNX2_PCICFG_INT_ACK_CMD, cp->int_num |
@@ -2464,6 +2477,21 @@ static int cnic_start_bnx2_hw(struct cnic_dev *dev)
        return 0;
 }
 
+static void cnic_init_rings(struct cnic_dev *dev)
+{
+       if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
+               cnic_init_bnx2_tx_ring(dev);
+               cnic_init_bnx2_rx_ring(dev);
+       }
+}
+
+static void cnic_shutdown_rings(struct cnic_dev *dev)
+{
+       if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
+               cnic_shutdown_bnx2_rx_ring(dev);
+       }
+}
+
 static int cnic_register_netdev(struct cnic_dev *dev)
 {
        struct cnic_local *cp = dev->cnic_priv;