iwlwifi: add csr configuration for 6300 devices

Recently we have switched the csr addresses and values configuration
from a single configuration to all devices to a per-device configuration.
Doing that, the configuration for 6300 devices wasn't set.
This missing definition introduced a kernel panic once trying to access
the csr's.

Add the missing 6300 csr configuration.

While at it, add a checker that the csr values were indeed
configured, and bail out more gracefully if not.

Fixes: a8cbb46f ("iwlwifi: allow different csr flags for different device families")
Signed-off-by: Golan Ben Ami <golan.ben.ami@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/cfg/6000.c

@@ -373,6 +373,7 @@ const struct iwl_cfg iwl6000_3agn_cfg = {
 	.eeprom_params = &iwl6000_eeprom_params,
 	.ht_params = &iwl6000_ht_params,
 	.led_mode = IWL_LED_BLINK,
+	.csr = &iwl_csr_v1,
 };
 
 MODULE_FIRMWARE(IWL6000_MODULE_FIRMWARE(IWL6000_UCODE_API_MAX));

drivers/net/wireless/intel/iwlwifi/pcie/drv.c

@@ -836,6 +836,9 @@ static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct iwl_trans *iwl_trans;
 	int ret;
 
+	if (WARN_ONCE(!cfg->csr, "CSR addresses aren't configured\n"))
+		return -EINVAL;
+
 	iwl_trans = iwl_trans_pcie_alloc(pdev, ent, cfg);
 	if (IS_ERR(iwl_trans))
 		return PTR_ERR(iwl_trans);