From: Stanislaw Gruszka Date: Mon, 10 Jan 2011 11:56:05 +0000 (+0100) Subject: hostap_cs: fix sleeping function called from invalid context X-Git-Tag: v2.6.35.12~204 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=755fc62c61ab748285ef5940f6a7c9b93f1b70b8;p=thirdparty%2Fkernel%2Fstable.git hostap_cs: fix sleeping function called from invalid context commit 4e5518ca53be29c1ec3c00089c97bef36bfed515 upstream. pcmcia_request_irq() and pcmcia_enable_device() are intended to be called from process context (first function allocate memory with GFP_KERNEL, second take a mutex). We can not take spin lock and call them. It's safe to move spin lock after pcmcia_enable_device() as we still hold off IRQ until dev->base_addr is 0 and driver will not proceed with interrupts when is not ready. Patch resolves: https://bugzilla.redhat.com/show_bug.cgi?id=643758 Reported-and-tested-by: rbugz@biobind.com Signed-off-by: Stanislaw Gruszka Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman Signed-off-by: Andi Kleen --- diff --git a/drivers/net/wireless/hostap/hostap_cs.c b/drivers/net/wireless/hostap/hostap_cs.c index 29b31a694b59c..357da816f086e 100644 --- a/drivers/net/wireless/hostap/hostap_cs.c +++ b/drivers/net/wireless/hostap/hostap_cs.c @@ -626,15 +626,9 @@ 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_unlock; + goto failed; /* * This actually configures the PCMCIA socket -- setting up @@ -643,11 +637,12 @@ static int prism2_config(struct pcmcia_device *link) */ ret = pcmcia_request_configuration(link, &link->conf); if (ret) - goto failed_unlock; + goto failed; + /* IRQ handler cannot proceed until at dev->base_addr is initialized */ + spin_lock_irqsave(&local->irq_init_lock, flags); dev->irq = link->irq; dev->base_addr = link->io.BasePort1; - spin_unlock_irqrestore(&local->irq_init_lock, flags); /* Finally, report what we've done */ @@ -676,8 +671,6 @@ 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);