From 79caef2412a36c3ed223be7e35395b41e99c6c4c Mon Sep 17 00:00:00 2001
From: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Date: Wed, 26 Oct 2016 13:34:33 +0530
Subject: [PATCH 02/11] scsi: mpt3sas: Fix for incorrect numbers for MSIX
 vectors enabled when non RDPQ card is enumerated first.

No. of MSIX vectors supported = min (Total no. of CPU cores,
MSIX vectors supported by card)

when RDPQ is disabled "max_msix_vectors" module parameter which was
declared as global was set to '8' and hence if there are more than one card
in system among which if RDPQ disabled card is enumerated first then only 8
MSIX vectors was getting enabled for all the cards(including RDPQ enabled
card,which can support more than 8 MSIX vectors).

Used local variable instead of global variable ,if RDPQ is disabled this
local variable is set to '8' else it is set to "max_msix_vectors" (by
default this is set to -1, whose value can be set by user during driver
load time).So now regardless of whether RDPQ disabled card is enumerated
first or RDPQ enabled card is enumerated first , MSIX vectors enabled
depends on the cards capability.

Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index c77c31c..2319db8 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -1960,7 +1960,7 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
 {
 	struct msix_entry *entries, *a;
 	int r;
-	int i;
+	int i, local_max_msix_vectors;
 	u8 try_msix = 0;
 
 	if (msix_disable == -1 || msix_disable == 0)
@@ -1980,13 +1980,15 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
 	  ioc->cpu_count, max_msix_vectors);
 
 	if (!ioc->rdpq_array_enable && max_msix_vectors == -1)
-		max_msix_vectors = 8;
+		local_max_msix_vectors = 8;
+	else
+		local_max_msix_vectors = max_msix_vectors;
 
-	if (max_msix_vectors > 0) {
-		ioc->reply_queue_count = min_t(int, max_msix_vectors,
+	if (local_max_msix_vectors > 0) {
+		ioc->reply_queue_count = min_t(int, local_max_msix_vectors,
 			ioc->reply_queue_count);
 		ioc->msix_vector_count = ioc->reply_queue_count;
-	} else if (max_msix_vectors == 0)
+	} else if (local_max_msix_vectors == 0)
 		goto try_ioapic;
 
 	if (ioc->msix_vector_count < ioc->cpu_count)
-- 
1.8.3.1