linux-kernel - [PATCH 5.5 026/189] scsi: megaraid

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Message-Id: <20200310123642.090587718@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:37:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomas Henzl <thenzl@...hat.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Lee Duncan <lduncan@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 026/189] scsi: megaraid_sas: silence a warning

From: Tomas Henzl <thenzl@...hat.com>

[ Upstream commit 0e99b2c625da181aebf1a3d13493e3f7a5057a9c ]

Add a flag to DMA memory allocation to silence a warning.

This driver allocates DMA memory for IO frames. This allocation may exceed
MAX_ORDER pages for few megaraid_sas controllers (controllers with very
high queue depth). Consequently, the driver has logic to keep reducing the
controller queue depth until the DMA memory allocation succeeds.

On impacted megaraid_sas controllers there would be multiple DMA allocation
failures until driver settled on an allocation that fit. These failed DMA
allocation requests caused stack traces in system logs. These were not
harmful and this patch silences those warnings/stack traces.

[mkp: clarified commit desc]

Link: https://lore.kernel.org/r/20200204152413.7107-1-thenzl@redhat.com
Signed-off-by: Tomas Henzl <thenzl@...hat.com>
Acked-by: Sumit Saxena <sumit.saxena@...adcom.com>
Reviewed-by: Lee Duncan <lduncan@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 46bc062d873ef..d868388018053 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -594,7 +594,8 @@ megasas_alloc_request_fusion(struct megasas_instance *instance)
 
 	fusion->io_request_frames =
 			dma_pool_alloc(fusion->io_request_frames_pool,
-				GFP_KERNEL, &fusion->io_request_frames_phys);
+				GFP_KERNEL | __GFP_NOWARN,
+				&fusion->io_request_frames_phys);
 	if (!fusion->io_request_frames) {
 		if (instance->max_fw_cmds >= (MEGASAS_REDUCE_QD_COUNT * 2)) {
 			instance->max_fw_cmds -= MEGASAS_REDUCE_QD_COUNT;
@@ -632,7 +633,7 @@ megasas_alloc_request_fusion(struct megasas_instance *instance)
 
 		fusion->io_request_frames =
 			dma_pool_alloc(fusion->io_request_frames_pool,
-				       GFP_KERNEL,
+				       GFP_KERNEL | __GFP_NOWARN,
 				       &fusion->io_request_frames_phys);
 
 		if (!fusion->io_request_frames) {
-- 
2.20.1