From: Golan Ben Ami Date: Thu, 15 Dec 2016 08:22:36 +0000 (+0200) Subject: iwlwifi: pcie: Re-configure IVAR table after stop device X-Git-Tag: v4.11-rc1~124^2~152^2^2~13 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f4a1f04a3f66aebbe8665a28d9cf0b5e3d1c6f9d;p=karo-tx-linux.git iwlwifi: pcie: Re-configure IVAR table after stop device When getting RF_KILL and disabling radio, the device gets stopped and reset. This erases the IVAR table that matches the interrupt to its cause, and is essential for MSIX proper functionality. Till now, the table wasn't re-configured after the reset, and therefore the interrupt that enabled radio didn't fire on the right irq, and the driver didn't handle it correctly. To fix this, configure the IVAR table again after resetting the device. Signed-off-by: Golan Ben-Ami Signed-off-by: Luca Coelho --- diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index bb2a9a151957..7f05fc56587a 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -1245,6 +1245,15 @@ static void _iwl_trans_pcie_stop_device(struct iwl_trans *trans, bool low_power) iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET); usleep_range(1000, 2000); + /* + * Upon stop, the IVAR table gets erased, so msi-x won't + * work. This causes a bug in RF-KILL flows, since the interrupt + * that enables radio won't fire on the correct irq, and the + * driver won't be able to handle the interrupt. + * Configure the IVAR table again after reset. + */ + iwl_pcie_conf_msix_hw(trans_pcie); + /* * Upon stop, the APM issues an interrupt if HW RF kill is set. * This is a bug in certain verions of the hardware.