linux-kernel - [PATCH 4.5 036/238] aacraid: Set correct msix count for EEH recovery

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Date:	Sun, 10 Apr 2016 11:33:33 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Raghava Aditya Renukunta <raghavaaditya.renukunta@...s.com>,
	Shane Seymour <shane.seymour@....com>,
	Johannes Thumshirn <jthushirn@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.5 036/238] aacraid: Set correct msix count for EEH recovery

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Raghava Aditya Renukunta <raghavaaditya.renukunta@...s.com>

commit ecc479e00db8eb110b200afe1effcb3df20ca7ae upstream.

During EEH recovery number of online CPU's might change thereby changing
the number of MSIx vectors. Since each fib is allocated to a vector,
changes in the number of vectors causes fib to be sent thru invalid
vectors.In addition the correct number of MSIx vectors is not updated in
the INIT struct sent to the controller, when it is reinitialized.

Fixed by reassigning vectors to fibs based on the updated number of MSIx
vectors and updating the INIT structure before sending to controller.

Fixes: MSI-X vector calculation for suspend/resume
Signed-off-by: Raghava Aditya Renukunta <raghavaaditya.renukunta@...s.com>
Reviewed-by: Shane Seymour <shane.seymour@....com>
Reviewed-by: Johannes Thumshirn <jthushirn@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/aacraid/linit.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -1404,8 +1404,18 @@ static int aac_acquire_resources(struct

 	aac_adapter_enable_int(dev);

-	if (!dev->sync_mode)
+	/*max msix may change  after EEH
+	 * Re-assign vectors to fibs
+	 */
+	aac_fib_vector_assign(dev);
+
+	if (!dev->sync_mode) {
+		/* After EEH recovery or suspend resume, max_msix count
+		 * may change, therfore updating in init as well.
+		 */
 		aac_adapter_start(dev);
+		dev->init->Sa_MSIXVectors = cpu_to_le32(dev->max_msix);
+	}
 	return 0;

 error_iounmap: