From 89c318ed3985da1271e00ad586f2dce8a6e75656 Mon Sep 17 00:00:00 2001
From: Zhu Yi <yi.zhu@intel.com>
Date: Thu, 8 Jun 2006 22:19:49 -0700
Subject: [PATCH] [PATCH] ipw2200 locking fix
Well, this is not 100% if when the card fires two consecutive
interrupts. Though unlikely, it's better to protect early than seeing
some "weird" bugs one day. I proposed attached patch. If you can help to
test, that will be appreciated (I cannot see the lockdep warning on my
box somehow).
Cc: Frederik Deweerdt <deweerdt@free.fr>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/ipw2200.c | 41 ++++++++++++++++++++++++++--------
drivers/net/wireless/ipw2200.h | 1 +
2 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 39f82f219749..081a8999666e 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -533,7 +533,7 @@ static inline void ipw_clear_bit(struct ipw_priv *priv, u32 reg, u32 mask)
ipw_write32(priv, reg, ipw_read32(priv, reg) & ~mask);
}
-static inline void ipw_enable_interrupts(struct ipw_priv *priv)
+static inline void __ipw_enable_interrupts(struct ipw_priv *priv)
{
if (priv->status & STATUS_INT_ENABLED)
return;
@@ -541,7 +541,7 @@ static inline void ipw_enable_interrupts(struct ipw_priv *priv)
ipw_write32(priv, IPW_INTA_MASK_R, IPW_INTA_MASK_ALL);
}
-static inline void ipw_disable_interrupts(struct ipw_priv *priv)
+static inline void __ipw_disable_interrupts(struct ipw_priv *priv)
{
if (!(priv->status & STATUS_INT_ENABLED))
return;
@@ -549,6 +549,24 @@ static inline void ipw_disable_interrupts(struct ipw_priv *priv)
ipw_write32(priv, IPW_INTA_MASK_R, ~IPW_INTA_MASK_ALL);
}
+static inline void ipw_enable_interrupts(struct ipw_priv *priv)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->irq_lock, flags);
+ __ipw_enable_interrupts(priv);
+ spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
+static inline void ipw_disable_interrupts(struct ipw_priv *priv)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->irq_lock, flags);
+ __ipw_disable_interrupts(priv);
+ spin_unlock_irqrestore(&priv->irq_lock, flags);
+}
+
#ifdef CONFIG_IPW2200_DEBUG
static char *ipw_error_desc(u32 val)
{
@@ -1856,7 +1874,7 @@ static void ipw_irq_tasklet(struct ipw_priv *priv)
unsigned long flags;
int rc = 0;
- spin_lock_irqsave(&priv->lock, flags);
+ spin_lock_irqsave(&priv->irq_lock, flags);
inta = ipw_read32(priv, IPW_INTA_RW);
inta_mask = ipw_read32(priv, IPW_INTA_MASK_R);
@@ -1865,6 +1883,10 @@ static void ipw_irq_tasklet(struct ipw_priv *priv)
/* Add any cached INTA values that need to be handled */
inta |= priv->isr_inta;
+ spin_unlock_irqrestore(&priv->irq_lock, flags);
+
+ spin_lock_irqsave(&priv->lock, flags);
+
/* handle all the justifications for the interrupt */
if (inta & IPW_INTA_BIT_RX_TRANSFER) {
ipw_rx(priv);
@@ -1993,10 +2015,10 @@ static void ipw_irq_tasklet(struct ipw_priv *priv)
IPW_ERROR("Unhandled INTA bits 0x%08x\n", inta & ~handled);
}
+ spin_unlock_irqrestore(&priv->lock, flags);
+
/* enable all interrupts */
ipw_enable_interrupts(priv);
-
- spin_unlock_irqrestore(&priv->lock, flags);
}
#define IPW_CMD(x) case IPW_CMD_ ## x : return #x
@@ -10460,7 +10482,7 @@ static irqreturn_t ipw_isr(int irq, void *data, struct pt_regs *regs)
if (!priv)
return IRQ_NONE;
- spin_lock(&priv->lock);
+ spin_lock(&priv->irq_lock);
if (!(priv->status & STATUS_INT_ENABLED)) {
/* Shared IRQ */
@@ -10482,7 +10504,7 @@ static irqreturn_t ipw_isr(int irq, void *data, struct pt_regs *regs)
}
/* tell the device to stop sending interrupts */
- ipw_disable_interrupts(priv);
+ __ipw_disable_interrupts(priv);
/* ack current interrupts */
inta &= (IPW_INTA_MASK_ALL & inta_mask);
@@ -10493,11 +10515,11 @@ static irqreturn_t ipw_isr(int irq, void *data, struct pt_regs *regs)
tasklet_schedule(&priv->irq_tasklet);
- spin_unlock(&priv->lock);
+ spin_unlock(&priv->irq_lock);
return IRQ_HANDLED;
none:
- spin_unlock(&priv->lock);
+ spin_unlock(&priv->irq_lock);
return IRQ_NONE;
}
@@ -11477,6 +11499,7 @@ static int ipw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
#ifdef CONFIG_IPW2200_DEBUG
ipw_debug_level = debug;
#endif
+ spin_lock_init(&priv->irq_lock);
spin_lock_init(&priv->lock);
for (i = 0; i < IPW_IBSS_MAC_HASH_SIZE; i++)
INIT_LIST_HEAD(&priv->ibss_mac_hash[i]);
diff --git a/drivers/net/wireless/ipw2200.h b/drivers/net/wireless/ipw2200.h
index 6044c0be2c80..ea12ad66b8e8 100644
--- a/drivers/net/wireless/ipw2200.h
+++ b/drivers/net/wireless/ipw2200.h
@@ -1173,6 +1173,7 @@ struct ipw_priv {
struct ieee80211_device *ieee;
spinlock_t lock;
+ spinlock_t irq_lock;
struct mutex mutex;
/* basic pci-network driver stuff */