diff options
| author | Tim Gardner <tim.gardner@canonical.com> | 2010-06-08 11:33:02 -0600 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-06-15 15:44:41 -0400 |
| commit | d6a574ff6bfb842bdb98065da053881ff527be46 (patch) | |
| tree | 899cdc5cdfc75d21a8c258ecfc2bc6b1e1c79895 /drivers/net/wireless/hostap/hostap_cs.c | |
| parent | a69b03e941abae00380fc6bc1877fb797a1b31e6 (diff) | |
| download | linux-d6a574ff6bfb842bdb98065da053881ff527be46.tar.bz2 | |
hostap: Protect against initialization interrupt
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>
Diffstat (limited to 'drivers/net/wireless/hostap/hostap_cs.c')
| -rw-r--r-- | drivers/net/wireless/hostap/hostap_cs.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/net/wireless/hostap/hostap_cs.c b/drivers/net/wireless/hostap/hostap_cs.c index db72461c486b..29b31a694b59 100644 --- a/drivers/net/wireless/hostap/hostap_cs.c +++ b/drivers/net/wireless/hostap/hostap_cs.c @@ -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); |