powerpc/eeh: Cleanup control flow in eeh_handle_normal_event()

Rather than mixing "if (state)" blocks and gotos, convert entirely to
"if (state)" blocks to make the state machine behaviour clearer.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/eeh_driver.c

@@ -808,10 +808,8 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		pr_err("EEH: PHB#%x-PE#%x has failed %d times in the last hour and has been permanently disabled.\n",
 		       pe->phb->global_number, pe->addr,
 		       pe->freeze_count);
-		goto hard_fail;
+		result = PCI_ERS_RESULT_DISCONNECT;
 	}
-	pr_warn("EEH: This PCI device has failed %d times in the last hour and will be permanently disabled after %d failures.\n",
-		pe->freeze_count, eeh_max_freezes);
 
 	/* Walk the various device drivers attached to this slot through
 	 * a reset sequence, giving each an opportunity to do what it needs
@@ -823,31 +821,39 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 	 * the error. Override the result if necessary to have partially
 	 * hotplug for this case.
 	 */
+	if (result != PCI_ERS_RESULT_DISCONNECT) {
+		pr_warn("EEH: This PCI device has failed %d times in the last hour and will be permanently disabled after %d failures.\n",
+			pe->freeze_count, eeh_max_freezes);
 		pr_info("EEH: Notify device drivers to shutdown\n");
 		eeh_set_channel_state(pe, pci_channel_io_frozen);
 		eeh_set_irq_state(pe, false);
-	eeh_pe_report("error_detected(IO frozen)", pe, eeh_report_error,
-		      &result);
+		eeh_pe_report("error_detected(IO frozen)", pe,
+			      eeh_report_error, &result);
 		if ((pe->type & EEH_PE_PHB) &&
 		    result != PCI_ERS_RESULT_NONE &&
 		    result != PCI_ERS_RESULT_NEED_RESET)
 			result = PCI_ERS_RESULT_NEED_RESET;
+	}
 
 	/* Get the current PCI slot state. This can take a long time,
 	 * sometimes over 300 seconds for certain systems.
 	 */
+	if (result != PCI_ERS_RESULT_DISCONNECT) {
 		rc = eeh_wait_state(pe, MAX_WAIT_FOR_RECOVERY*1000);
 		if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) {
 			pr_warn("EEH: Permanent failure\n");
-		goto hard_fail;
+			result = PCI_ERS_RESULT_DISCONNECT;
+		}
 	}
 
 	/* Since rtas may enable MMIO when posting the error log,
 	 * don't post the error log until after all dev drivers
 	 * have been informed.
 	 */
+	if (result != PCI_ERS_RESULT_DISCONNECT) {
 		pr_info("EEH: Collect temporary log\n");
 		eeh_slot_error_detail(pe, EEH_LOG_TEMP);
+	}
 
 	/* If all device drivers were EEH-unaware, then shut
 	 * down all of the device drivers, and hope they
@@ -859,7 +865,7 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		if (rc) {
 			pr_warn("%s: Unable to reset, err=%d\n",
 				__func__, rc);
-			goto hard_fail;
+			result = PCI_ERS_RESULT_DISCONNECT;
 		}
 	}
 
@@ -868,9 +874,9 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		pr_info("EEH: Enable I/O for affected devices\n");
 		rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO);
 
-		if (rc < 0)
-			goto hard_fail;
-		if (rc) {
+		if (rc < 0) {
+			result = PCI_ERS_RESULT_DISCONNECT;
+		} else if (rc) {
 			result = PCI_ERS_RESULT_NEED_RESET;
 		} else {
 			pr_info("EEH: Notify device drivers to resume I/O\n");
@@ -884,9 +890,9 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		pr_info("EEH: Enabled DMA for affected devices\n");
 		rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA);
 
-		if (rc < 0)
-			goto hard_fail;
-		if (rc) {
+		if (rc < 0) {
+			result = PCI_ERS_RESULT_DISCONNECT;
+		} else if (rc) {
 			result = PCI_ERS_RESULT_NEED_RESET;
 		} else {
 			/*
@@ -899,12 +905,6 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		}
 	}
 
-	/* If any device has a hard failure, then shut off everything. */
-	if (result == PCI_ERS_RESULT_DISCONNECT) {
-		pr_warn("EEH: Device driver gave up\n");
-		goto hard_fail;
-	}
-
 	/* If any device called out for a reset, then reset the slot */
 	if (result == PCI_ERS_RESULT_NEED_RESET) {
 		pr_info("EEH: Reset without hotplug activity\n");
@@ -912,27 +912,21 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		if (rc) {
 			pr_warn("%s: Cannot reset, err=%d\n",
 				__func__, rc);
-			goto hard_fail;
-		}
-
-		pr_info("EEH: Notify device drivers "
-			"the completion of reset\n");
+			result = PCI_ERS_RESULT_DISCONNECT;
+		} else {
 			result = PCI_ERS_RESULT_NONE;
 			eeh_set_channel_state(pe, pci_channel_io_normal);
 			eeh_set_irq_state(pe, true);
-		eeh_pe_report("slot_reset", pe, eeh_report_reset, &result);
+			eeh_pe_report("slot_reset", pe, eeh_report_reset,
+				      &result);
 		}
-
-	/* All devices should claim they have recovered by now. */
-	if ((result != PCI_ERS_RESULT_RECOVERED) &&
-	    (result != PCI_ERS_RESULT_NONE)) {
-		pr_warn("EEH: Not recovered\n");
-		goto hard_fail;
 	}
 
+	if ((result == PCI_ERS_RESULT_RECOVERED) ||
+	    (result == PCI_ERS_RESULT_NONE)) {
 		/*
-	 * For those hot removed VFs, we should add back them after PF get
-	 * recovered properly.
+		 * For those hot removed VFs, we should add back them after PF
+		 * get recovered properly.
 		 */
 		list_for_each_entry_safe(edev, tmp, &rmv_data.removed_vf_list,
 					 rmv_entry) {
@@ -953,9 +947,7 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 		}
 
 		pr_info("EEH: Recovery successful.\n");
-	goto final;
-
-hard_fail:
+	} else  {
 		/*
 		 * About 90% of all real-life EEH failures in the field
 		 * are due to poorly seated PCI cards. Only 10% or so are
@@ -994,7 +986,7 @@ void eeh_handle_normal_event(struct eeh_pe *pe)
 			/* The passed PE should no longer be used */
 			return;
 		}
-final:
+	}
 	eeh_pe_state_clear(pe, EEH_PE_RECOVERING);
 }