p54: fix misbehavings when firmware can't be found

This patch fixes a double-free error in p54pci
( http://bugzilla.kernel.org/show_bug.cgi?id=11782 )

Trying to free already-free IRQ 10
Pid: 108, comm: pccardd Not tainted 2.6.27-05577-g0cfd810-dirty #1
Call Trace:
 [<c01265dc>] free_irq+0xad/0xb9
 [<c01050dd>] dma_generic_alloc_coherent+0x0/0xd7
 [<c01ba8e6>] p54p_stop+0x4a/0x1fa
 [<c01050dd>] dma_generic_alloc_coherent+0x0/0xd7
 [<c02348c5>] p54p_probe+0x23e/0x302

Tested-by: Sean Young
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c
index 1c2a02a..88b3cad 100644 (file)
--- a/drivers/net/wireless/p54/p54pci.c
+++ b/drivers/net/wireless/p54/p54pci.c
@@ -346,68 +346,6 @@ static void p54p_tx(struct ieee80211_hw *dev, struct p54_control_hdr *data,
                printk(KERN_INFO "%s: tx overflow.\n", wiphy_name(dev->wiphy));
 }
 
-static int p54p_open(struct ieee80211_hw *dev)
-{
-       struct p54p_priv *priv = dev->priv;
-       int err;
-
-       init_completion(&priv->boot_comp);
-       err = request_irq(priv->pdev->irq, &p54p_interrupt,
-                         IRQF_SHARED, "p54pci", dev);
-       if (err) {
-               printk(KERN_ERR "%s: failed to register IRQ handler\n",
-                      wiphy_name(dev->wiphy));
-               return err;
-       }
-
-       memset(priv->ring_control, 0, sizeof(*priv->ring_control));
-       err = p54p_upload_firmware(dev);
-       if (err) {
-               free_irq(priv->pdev->irq, dev);
-               return err;
-       }
-       priv->rx_idx_data = priv->tx_idx_data = 0;
-       priv->rx_idx_mgmt = priv->tx_idx_mgmt = 0;
-
-       p54p_refill_rx_ring(dev, 0, priv->ring_control->rx_data,
-               ARRAY_SIZE(priv->ring_control->rx_data), priv->rx_buf_data);
-
-       p54p_refill_rx_ring(dev, 2, priv->ring_control->rx_mgmt,
-               ARRAY_SIZE(priv->ring_control->rx_mgmt), priv->rx_buf_mgmt);
-
-       P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
-       P54P_READ(ring_control_base);
-       wmb();
-       udelay(10);
-
-       P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
-       P54P_READ(int_enable);
-       wmb();
-       udelay(10);
-
-       P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
-       P54P_READ(dev_int);
-
-       if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
-               printk(KERN_ERR "%s: Cannot boot firmware!\n",
-                      wiphy_name(dev->wiphy));
-               free_irq(priv->pdev->irq, dev);
-               return -ETIMEDOUT;
-       }
-
-       P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
-       P54P_READ(int_enable);
-       wmb();
-       udelay(10);
-
-       P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
-       P54P_READ(dev_int);
-       wmb();
-       udelay(10);
-
-       return 0;
-}
-
 static void p54p_stop(struct ieee80211_hw *dev)
 {
        struct p54p_priv *priv = dev->priv;
@@ -474,6 +412,68 @@ static void p54p_stop(struct ieee80211_hw *dev)
        memset(ring_control, 0, sizeof(*ring_control));
 }
 
+static int p54p_open(struct ieee80211_hw *dev)
+{
+       struct p54p_priv *priv = dev->priv;
+       int err;
+
+       init_completion(&priv->boot_comp);
+       err = request_irq(priv->pdev->irq, &p54p_interrupt,
+                         IRQF_SHARED, "p54pci", dev);
+       if (err) {
+               printk(KERN_ERR "%s: failed to register IRQ handler\n",
+                      wiphy_name(dev->wiphy));
+               return err;
+       }
+
+       memset(priv->ring_control, 0, sizeof(*priv->ring_control));
+       err = p54p_upload_firmware(dev);
+       if (err) {
+               free_irq(priv->pdev->irq, dev);
+               return err;
+       }
+       priv->rx_idx_data = priv->tx_idx_data = 0;
+       priv->rx_idx_mgmt = priv->tx_idx_mgmt = 0;
+
+       p54p_refill_rx_ring(dev, 0, priv->ring_control->rx_data,
+               ARRAY_SIZE(priv->ring_control->rx_data), priv->rx_buf_data);
+
+       p54p_refill_rx_ring(dev, 2, priv->ring_control->rx_mgmt,
+               ARRAY_SIZE(priv->ring_control->rx_mgmt), priv->rx_buf_mgmt);
+
+       P54P_WRITE(ring_control_base, cpu_to_le32(priv->ring_control_dma));
+       P54P_READ(ring_control_base);
+       wmb();
+       udelay(10);
+
+       P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_INIT));
+       P54P_READ(int_enable);
+       wmb();
+       udelay(10);
+
+       P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_RESET));
+       P54P_READ(dev_int);
+
+       if (!wait_for_completion_interruptible_timeout(&priv->boot_comp, HZ)) {
+               printk(KERN_ERR "%s: Cannot boot firmware!\n",
+                      wiphy_name(dev->wiphy));
+               p54p_stop(dev);
+               return -ETIMEDOUT;
+       }
+
+       P54P_WRITE(int_enable, cpu_to_le32(ISL38XX_INT_IDENT_UPDATE));
+       P54P_READ(int_enable);
+       wmb();
+       udelay(10);
+
+       P54P_WRITE(dev_int, cpu_to_le32(ISL38XX_DEV_INT_UPDATE));
+       P54P_READ(dev_int);
+       wmb();
+       udelay(10);
+
+       return 0;
+}
+
 static int __devinit p54p_probe(struct pci_dev *pdev,
                                const struct pci_device_id *id)
 {
@@ -556,11 +556,13 @@ static int __devinit p54p_probe(struct pci_dev *pdev,
        spin_lock_init(&priv->lock);
        tasklet_init(&priv->rx_tasklet, p54p_rx_tasklet, (unsigned long)dev);
 
-       p54p_open(dev);
+       err = p54p_open(dev);
+       if (err)
+               goto err_free_common;
        err = p54_read_eeprom(dev);
        p54p_stop(dev);
        if (err)
-               goto err_free_desc;
+               goto err_free_common;
 
        err = ieee80211_register_hw(dev);
        if (err) {
@@ -573,8 +575,6 @@ static int __devinit p54p_probe(struct pci_dev *pdev,
 
  err_free_common:
        p54_free_common(dev);
-
- err_free_desc:
        pci_free_consistent(pdev, sizeof(*priv->ring_control),
                            priv->ring_control, priv->ring_control_dma);