scsi: megaraid_sas: silence a warning

[ 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@redhat.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 46bc062d873efc4c77bc611892dd1929d2074804..d86838801805392bd17e80c949eada7ad2740eb5 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -594,7 +594,8 @@ retry_alloc:
 
        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 @@ retry_alloc:
 
                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) {