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Message-Id: <200807301938.m6UJcwrD012511@imap1.linux-foundation.org>
Date: Wed, 30 Jul 2008 12:38:58 -0700
From: akpm@...ux-foundation.org
To: jeff@...zik.org
Cc: netdev@...r.kernel.org, akpm@...ux-foundation.org,
romieu@...zoreil.com, arjan@...ux.intel.com,
rseguier@...eleport.net
Subject: [patch 05/12] via-velocity: fix sleep-with-spinlock bug during MTU change
From: Francois Romieu <romieu@...zoreil.com>
velocity_init_{rd/tx}_ring use kcalloc(..., GFP_KERNEL).
Allocate and free everyting outside of the locked section.
Spotted-by: Arjan van de Ven <arjan@...ux.intel.com>
Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Fixed-by: Seguier Regis <rseguier@...eleport.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
drivers/net/via-velocity.c | 132 ++++++++++++++++++++++-------------
1 file changed, 86 insertions(+), 46 deletions(-)
diff -puN drivers/net/via-velocity.c~via-velocity-fix-sleep-with-spinlock-bug-during-mtu-change drivers/net/via-velocity.c
--- a/drivers/net/via-velocity.c~via-velocity-fix-sleep-with-spinlock-bug-during-mtu-change
+++ a/drivers/net/via-velocity.c
@@ -662,6 +662,10 @@ static void velocity_vlan_rx_kill_vid(st
spin_unlock_irq(&vptr->lock);
}
+static void velocity_init_rx_ring_indexes(struct velocity_info *vptr)
+{
+ vptr->rx.dirty = vptr->rx.filled = vptr->rx.curr = 0;
+}
/**
* velocity_rx_reset - handle a receive reset
@@ -677,7 +681,7 @@ static void velocity_rx_reset(struct vel
struct mac_regs __iomem * regs = vptr->mac_regs;
int i;
- vptr->rx.dirty = vptr->rx.filled = vptr->rx.curr = 0;
+ velocity_init_rx_ring_indexes(vptr);
/*
* Init state, all RD entries belong to the NIC
@@ -1093,14 +1097,14 @@ static int __devinit velocity_get_pci_in
}
/**
- * velocity_init_rings - set up DMA rings
+ * velocity_init_dma_rings - set up DMA rings
* @vptr: Velocity to set up
*
* Allocate PCI mapped DMA rings for the receive and transmit layer
* to use.
*/
-static int velocity_init_rings(struct velocity_info *vptr)
+static int velocity_init_dma_rings(struct velocity_info *vptr)
{
struct velocity_opt *opt = &vptr->options;
const unsigned int rx_ring_size = opt->numrx * sizeof(struct rx_desc);
@@ -1141,13 +1145,13 @@ static int velocity_init_rings(struct ve
}
/**
- * velocity_free_rings - free PCI ring pointers
+ * velocity_free_dma_rings - free PCI ring pointers
* @vptr: Velocity to free from
*
* Clean up the PCI ring buffers allocated to this velocity.
*/
-static void velocity_free_rings(struct velocity_info *vptr)
+static void velocity_free_dma_rings(struct velocity_info *vptr)
{
const int size = vptr->options.numrx * sizeof(struct rx_desc) +
vptr->options.numtx * sizeof(struct tx_desc) * vptr->tx.numq;
@@ -1229,7 +1233,7 @@ static int velocity_init_rd_ring(struct
if (!vptr->rx.info)
goto out;
- vptr->rx.filled = vptr->rx.dirty = vptr->rx.curr = 0;
+ velocity_init_rx_ring_indexes(vptr);
if (velocity_rx_refill(vptr) != vptr->options.numrx) {
VELOCITY_PRT(MSG_LEVEL_ERR, KERN_ERR
@@ -1847,6 +1851,40 @@ static void velocity_free_tx_buf(struct
tdinfo->skb = NULL;
}
+static int velocity_init_rings(struct velocity_info *vptr, int mtu)
+{
+ int ret;
+
+ velocity_set_rxbufsize(vptr, mtu);
+
+ ret = velocity_init_dma_rings(vptr);
+ if (ret < 0)
+ goto out;
+
+ ret = velocity_init_rd_ring(vptr);
+ if (ret < 0)
+ goto err_free_dma_rings_0;
+
+ ret = velocity_init_td_ring(vptr);
+ if (ret < 0)
+ goto err_free_rd_ring_1;
+out:
+ return ret;
+
+err_free_rd_ring_1:
+ velocity_free_rd_ring(vptr);
+err_free_dma_rings_0:
+ velocity_free_dma_rings(vptr);
+ goto out;
+}
+
+static void velocity_free_rings(struct velocity_info *vptr)
+{
+ velocity_free_td_ring(vptr);
+ velocity_free_rd_ring(vptr);
+ velocity_free_dma_rings(vptr);
+}
+
/**
* velocity_open - interface activation callback
* @dev: network layer device to open
@@ -1863,20 +1901,10 @@ static int velocity_open(struct net_devi
struct velocity_info *vptr = netdev_priv(dev);
int ret;
- velocity_set_rxbufsize(vptr, dev->mtu);
-
- ret = velocity_init_rings(vptr);
+ ret = velocity_init_rings(vptr, dev->mtu);
if (ret < 0)
goto out;
- ret = velocity_init_rd_ring(vptr);
- if (ret < 0)
- goto err_free_desc_rings;
-
- ret = velocity_init_td_ring(vptr);
- if (ret < 0)
- goto err_free_rd_ring;
-
/* Ensure chip is running */
pci_set_power_state(vptr->pdev, PCI_D0);
@@ -1889,7 +1917,8 @@ static int velocity_open(struct net_devi
if (ret < 0) {
/* Power down the chip */
pci_set_power_state(vptr->pdev, PCI_D3hot);
- goto err_free_td_ring;
+ velocity_free_rings(vptr);
+ goto out;
}
mac_enable_int(vptr->mac_regs);
@@ -1897,14 +1926,6 @@ static int velocity_open(struct net_devi
vptr->flags |= VELOCITY_FLAGS_OPENED;
out:
return ret;
-
-err_free_td_ring:
- velocity_free_td_ring(vptr);
-err_free_rd_ring:
- velocity_free_rd_ring(vptr);
-err_free_desc_rings:
- velocity_free_rings(vptr);
- goto out;
}
/**
@@ -1920,50 +1941,72 @@ err_free_desc_rings:
static int velocity_change_mtu(struct net_device *dev, int new_mtu)
{
struct velocity_info *vptr = netdev_priv(dev);
- unsigned long flags;
- int oldmtu = dev->mtu;
int ret = 0;
if ((new_mtu < VELOCITY_MIN_MTU) || new_mtu > (VELOCITY_MAX_MTU)) {
VELOCITY_PRT(MSG_LEVEL_ERR, KERN_NOTICE "%s: Invalid MTU.\n",
vptr->dev->name);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out_0;
}
if (!netif_running(dev)) {
dev->mtu = new_mtu;
- return 0;
+ goto out_0;
}
- if (new_mtu != oldmtu) {
+ if (dev->mtu != new_mtu) {
+ struct velocity_info *tmp_vptr;
+ unsigned long flags;
+ struct rx_info rx;
+ struct tx_info tx;
+
+ tmp_vptr = kzalloc(sizeof(*tmp_vptr), GFP_KERNEL);
+ if (!tmp_vptr) {
+ ret = -ENOMEM;
+ goto out_0;
+ }
+
+ tmp_vptr->dev = dev;
+ tmp_vptr->pdev = vptr->pdev;
+ tmp_vptr->options = vptr->options;
+ tmp_vptr->tx.numq = vptr->tx.numq;
+
+ ret = velocity_init_rings(tmp_vptr, new_mtu);
+ if (ret < 0)
+ goto out_free_tmp_vptr_1;
+
spin_lock_irqsave(&vptr->lock, flags);
netif_stop_queue(dev);
velocity_shutdown(vptr);
- velocity_free_td_ring(vptr);
- velocity_free_rd_ring(vptr);
+ rx = vptr->rx;
+ tx = vptr->tx;
- dev->mtu = new_mtu;
+ vptr->rx = tmp_vptr->rx;
+ vptr->tx = tmp_vptr->tx;
- velocity_set_rxbufsize(vptr, new_mtu);
+ tmp_vptr->rx = rx;
+ tmp_vptr->tx = tx;
- ret = velocity_init_rd_ring(vptr);
- if (ret < 0)
- goto out_unlock;
+ dev->mtu = new_mtu;
- ret = velocity_init_td_ring(vptr);
- if (ret < 0)
- goto out_unlock;
+ velocity_give_many_rx_descs(vptr);
velocity_init_registers(vptr, VELOCITY_INIT_COLD);
mac_enable_int(vptr->mac_regs);
netif_start_queue(dev);
-out_unlock:
+
spin_unlock_irqrestore(&vptr->lock, flags);
- }
+ velocity_free_rings(tmp_vptr);
+
+out_free_tmp_vptr_1:
+ kfree(tmp_vptr);
+ }
+out_0:
return ret;
}
@@ -2009,9 +2052,6 @@ static int velocity_close(struct net_dev
/* Power down the chip */
pci_set_power_state(vptr->pdev, PCI_D3hot);
- /* Free the resources */
- velocity_free_td_ring(vptr);
- velocity_free_rd_ring(vptr);
velocity_free_rings(vptr);
vptr->flags &= (~VELOCITY_FLAGS_OPENED);
_
--
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