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hostap: Protect against initialization interrupt

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Use an irq spinlock to hold off the IRQ handler until
enough early card init is complete such that the handler
can run without faulting.

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Tim Gardner
2010-06-08 11:33:02 -06:00
committed by John W. Linville
parent a69b03e941
commit d6a574ff6b
3 changed files with 27 additions and 3 deletions
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15
drivers/net/wireless/hostap/hostap_cs.c
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@@ -594,6 +594,7 @@ static int prism2_config(struct pcmcia_device *link)
local_info_t *local;
int ret = 1;
struct hostap_cs_priv *hw_priv;
unsigned long flags;
PDEBUG(DEBUG_FLOW, "prism2_config()\n");
@@ -625,9 +626,15 @@ static int prism2_config(struct pcmcia_device *link)
local->hw_priv = hw_priv;
hw_priv->link = link;
/*
* Make sure the IRQ handler cannot proceed until at least
* dev->base_addr is initialized.
*/
spin_lock_irqsave(&local->irq_init_lock, flags);
ret = pcmcia_request_irq(link, prism2_interrupt);
if (ret)
goto failed;
goto failed_unlock;
/*
* This actually configures the PCMCIA socket -- setting up
@@ -636,11 +643,13 @@ static int prism2_config(struct pcmcia_device *link)
*/
ret = pcmcia_request_configuration(link, &link->conf);
if (ret)
goto failed;
goto failed_unlock;
dev->irq = link->irq;
dev->base_addr = link->io.BasePort1;
spin_unlock_irqrestore(&local->irq_init_lock, flags);
/* Finally, report what we've done */
printk(KERN_INFO "%s: index 0x%02x: ",
dev_info, link->conf.ConfigIndex);
@@ -667,6 +676,8 @@ static int prism2_config(struct pcmcia_device *link)
return ret;
failed_unlock:
spin_unlock_irqrestore(&local->irq_init_lock, flags);
failed:
kfree(hw_priv);
prism2_release((u_long)link);