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iwlagn: enable only rfkill interrupt when device is down

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commit 554d1d027b19265c4aa3f718b3126d2b86e09a08 upstream.

Since commit 6cd0b1cb872b3bf9fc5de4536404206ab74bafdd "iwlagn: fix
hw-rfkill while the interface is down", we enable interrupts when
device is not ready to receive them. However hardware, when it is in
some inconsistent state, can generate other than rfkill interrupts
and crash the system. I can reproduce crash with "kernel BUG at
drivers/net/wireless/iwlwifi/iwl-agn.c:1010!" message, when forcing
firmware restarts.

To fix only enable rfkill interrupt when down device and after probe.
I checked patch on laptop with 5100 device, rfkill change is still
passed to user space when device is down.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stanislaw Gruszka 2010-12-23 12:38:21 +01:00 committed by Greg Kroah-Hartman
parent a0cac77b3e
commit 5d1347a1de
2 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -3530,9 +3530,10 @@ static void iwl_mac_stop(struct ieee80211_hw *hw)
flush_workqueue(priv->workqueue);
/* enable interrupts again in order to receive rfkill changes */
/* User space software may expect getting rfkill changes
* even if interface is down */
iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
iwl_enable_interrupts(priv);
iwl_enable_rfkill_int(priv);
IWL_DEBUG_MAC80211(priv, "leave\n");
}
@ -4515,14 +4516,14 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
* 8. Enable interrupts and read RFKILL state
*********************************************/
/* enable interrupts if needed: hw bug w/a */
/* enable rfkill interrupt: hw bug w/a */
pci_read_config_word(priv->pci_dev, PCI_COMMAND, &pci_cmd);
if (pci_cmd & PCI_COMMAND_INTX_DISABLE) {
pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
pci_write_config_word(priv->pci_dev, PCI_COMMAND, pci_cmd);
}
iwl_enable_interrupts(priv);
iwl_enable_rfkill_int(priv);
/* If platform's RF_KILL switch is NOT set to KILL */
if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)

6
drivers/net/wireless/iwlwifi/iwl-helpers.h
View File

@ -163,6 +163,12 @@ static inline void iwl_disable_interrupts(struct iwl_priv *priv)
IWL_DEBUG_ISR(priv, "Disabled interrupts\n");
}
static inline void iwl_enable_rfkill_int(struct iwl_priv *priv)
{
IWL_DEBUG_ISR(priv, "Enabling rfkill interrupt\n");
iwl_write32(priv, CSR_INT_MASK, CSR_INT_BIT_RF_KILL);
}
static inline void iwl_enable_interrupts(struct iwl_priv *priv)
{
IWL_DEBUG_ISR(priv, "Enabling interrupts\n");