powerpc/eeh: Correct retries in eeh_pe_reset_full()

Currently, eeh_pe_reset_full() will only attempt to reset a PE more
than once if activating the reset state and deactivating it both
succeed, but later polling shows that it hasn't become active.

Change this so that it will try up to three times for any reason other
than an unrecoverable slot error and adjust the message generation so
that it's clear weather the reset has ultimately succeeded or failed.
This allows the reset to succeed in some situations where it would
currently fail.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/eeh.c

@@ -912,7 +912,7 @@ int eeh_pe_reset_full(struct eeh_pe *pe, bool include_passed)
 	int reset_state = (EEH_PE_RESET | EEH_PE_CFG_BLOCKED);
 	int type = EEH_RESET_HOT;
 	unsigned int freset = 0;
-	int i, state, ret;
+	int i, state = 0, ret;
 
 	/*
 	 * Determine the type of reset to perform - hot or fundamental.
@@ -930,28 +930,32 @@ int eeh_pe_reset_full(struct eeh_pe *pe, bool include_passed)
 	/* Make three attempts at resetting the bus */
 	for (i = 0; i < 3; i++) {
 		ret = eeh_pe_reset(pe, type, include_passed);
-		if (ret)
-			break;
-
-		ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, include_passed);
-		if (ret)
-			break;
+		if (!ret)
+			ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE,
+					   include_passed);
+		if (ret) {
+			ret = -EIO;
+			pr_warn("EEH: Failure %d resetting PHB#%x-PE#%x (attempt %d)\n\n",
+				state, pe->phb->global_number, pe->addr, i + 1);
+			continue;
+		}
+		if (i)
+			pr_warn("EEH: PHB#%x-PE#%x: Successful reset (attempt %d)\n",
+				pe->phb->global_number, pe->addr, i + 1);
 
 		/* Wait until the PE is in a functioning state */
 		state = eeh_wait_state(pe, PCI_BUS_RESET_WAIT_MSEC);
 		if (state < 0) {
-			pr_warn("%s: Unrecoverable slot failure on PHB#%x-PE#%x",
-				__func__, pe->phb->global_number, pe->addr);
+			pr_warn("EEH: Unrecoverable slot failure on PHB#%x-PE#%x",
+				pe->phb->global_number, pe->addr);
 			ret = -ENOTRECOVERABLE;
 			break;
 		}
 		if (eeh_state_active(state))
 			break;
-
-		/* Set error in case this is our last attempt */
-		ret = -EIO;
-		pr_warn("%s: Failure %d resetting PHB#%x-PE#%x\n (%d)\n",
-			__func__, state, pe->phb->global_number, pe->addr, (i + 1));
+		else
+			pr_warn("EEH: PHB#%x-PE#%x: Slot inactive after reset: 0x%x (attempt %d)\n",
+				pe->phb->global_number, pe->addr, state, i + 1);
 	}
 
 	/* Resetting the PE may have unfrozen child PEs. If those PEs have been