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[2/6] iwlwifi: stop interrupts before stopping device

Message ID 1347297330-23338-3-git-send-email-johannes@sipsolutions.net (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Johannes Berg Sept. 10, 2012, 5:15 p.m. UTC 
From: David Spinadel <david.spinadel@intel.com>

If an RX interrupt is signalled after or during apm_stop
we may try to access the peripherals which are already
down. Prevent this by disabling interrupts first.

Signed-off-by: David Spinadel <david.spinadel@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 drivers/net/wireless/iwlwifi/pcie/trans.c |    4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 913ad46..7da075f 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -1453,6 +1453,10 @@  static void iwl_trans_pcie_stop_hw(struct iwl_trans *trans,
 	bool hw_rfkill;
 	unsigned long flags;
 
+	spin_lock_irqsave(&trans_pcie->irq_lock, flags);
+	iwl_disable_interrupts(trans);
+	spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
+
 	iwl_apm_stop(trans);
 
 	spin_lock_irqsave(&trans_pcie->irq_lock, flags);