[PATCH 02/12] iwlwifi: dbg: allow dump collection in case of an early error

[Luca Coelho]

From: Shahar S Matityahu <shahar.s.matity...@intel.com>

Improve the robustness of the dump collection flow in case of an early
error:
1. in iwl_trans_pcie_sync_nmi, disable and enable interrupts only if
   they were already enabled
2. attempt to initiate dump collection in iwl_fw_dbg_error_collect only
   if the device is enabled
3. check Tx command queue was already allocated before trying to collect it

Signed-off-by: Shahar S Matityahu <shahar.s.matity...@intel.com>
Signed-off-by: Luca Coelho <luciano.coe...@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/fw/dbg.c   |  7 +++++--
 .../net/wireless/intel/iwlwifi/pcie/trans.c   | 21 +++++++++++++++----
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c 
b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
index 5f52e40a2903..5650b57a64e9 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
@@ -2057,9 +2057,12 @@ int iwl_fw_dbg_error_collect(struct iwl_fw_runtime *fwrt,
                             enum iwl_fw_dbg_trigger trig_type)
 {
        int ret;
-       struct iwl_fw_dump_desc *iwl_dump_error_desc =
-               kmalloc(sizeof(*iwl_dump_error_desc), GFP_KERNEL);
+       struct iwl_fw_dump_desc *iwl_dump_error_desc;
 
+       if (!test_bit(STATUS_DEVICE_ENABLED, &fwrt->trans->status))
+               return -EIO;
+
+       iwl_dump_error_desc = kmalloc(sizeof(*iwl_dump_error_desc), GFP_KERNEL);
        if (!iwl_dump_error_desc)
                return -ENOMEM;
 
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c 
b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index 803fcbac4152..ca486a7af602 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -3172,7 +3172,7 @@ static struct iwl_trans_dump_data
        len = sizeof(*dump_data);
 
        /* host commands */
-       if (dump_mask & BIT(IWL_FW_ERROR_DUMP_TXCMD))
+       if (dump_mask & BIT(IWL_FW_ERROR_DUMP_TXCMD) && cmdq)
                len += sizeof(*data) +
                        cmdq->n_window * (sizeof(*txcmd) +
                                          TFD_MAX_PAYLOAD_SIZE);
@@ -3224,7 +3224,7 @@ static struct iwl_trans_dump_data
        len = 0;
        data = (void *)dump_data->data;
 
-       if (dump_mask & BIT(IWL_FW_ERROR_DUMP_TXCMD)) {
+       if (dump_mask & BIT(IWL_FW_ERROR_DUMP_TXCMD) && cmdq) {
                u16 tfd_size = trans_pcie->tfd_size;
 
                data->type = cpu_to_le32(IWL_FW_ERROR_DUMP_TXCMD);
@@ -3658,6 +3658,7 @@ void iwl_trans_pcie_sync_nmi(struct iwl_trans *trans)
 {
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long timeout = jiffies + IWL_TRANS_NMI_TIMEOUT;
+       bool interrupts_enabled = test_bit(STATUS_INT_ENABLED, &trans->status);
        u32 inta_addr, sw_err_bit;
 
        if (trans_pcie->msix_enabled) {
@@ -3668,7 +3669,12 @@ void iwl_trans_pcie_sync_nmi(struct iwl_trans *trans)
                sw_err_bit = CSR_INT_BIT_SW_ERR;
        }
 
-       iwl_disable_interrupts(trans);
+       /* if the interrupts were already disabled, there is no point in
+        * calling iwl_disable_interrupts
+        */
+       if (interrupts_enabled)
+               iwl_disable_interrupts(trans);
+
        iwl_force_nmi(trans);
        while (time_after(timeout, jiffies)) {
                u32 inta_hw = iwl_read32(trans, inta_addr);
@@ -3682,6 +3688,13 @@ void iwl_trans_pcie_sync_nmi(struct iwl_trans *trans)
 
                mdelay(1);
        }
-       iwl_enable_interrupts(trans);
+
+       /* enable interrupts only if there were already enabled before this
+        * function to avoid a case were the driver enable interrupts before
+        * proper configurations were made
+        */
+       if (interrupts_enabled)
+               iwl_enable_interrupts(trans);
+
        iwl_trans_fw_error(trans);
 }
-- 
2.20.1