megaraid_sas: reduce memory footprints in kdump mode

[deliverable/linux.git] / drivers / scsi / megaraid / megaraid_sas_base.c

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index e6ebc7ae2df18185a8c024bea126fa85c749a34c..858820255dcb92217117eee9e3aefb07e9726798 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -5761,13 +5761,6 @@ static int megasas_probe_one(struct pci_dev *pdev,
                break;
        }
 
-       instance->system_info_buf = pci_zalloc_consistent(pdev,
-                                       sizeof(struct MR_DRV_SYSTEM_INFO),
-                                       &instance->system_info_h);
-
-       if (!instance->system_info_buf)
-               dev_info(&instance->pdev->dev, "Can't allocate system info buffer\n");
-
        /* Crash dump feature related initialisation*/
        instance->drv_buf_index = 0;
        instance->drv_buf_alloc = 0;
@@ -5777,14 +5770,6 @@ static int megasas_probe_one(struct pci_dev *pdev,
        spin_lock_init(&instance->crashdump_lock);
        instance->crash_dump_buf = NULL;
 
-       if (!reset_devices)
-               instance->crash_dump_buf = pci_alloc_consistent(pdev,
-                                               CRASH_DMA_BUF_SIZE,
-                                               &instance->crash_dump_h);
-       if (!instance->crash_dump_buf)
-               dev_err(&pdev->dev, "Can't allocate Firmware "
-                       "crash dump DMA buffer\n");
-
        megasas_poll_wait_aen = 0;
        instance->flag_ieee = 0;
        instance->ev = NULL;
@@ -5803,11 +5788,26 @@ static int megasas_probe_one(struct pci_dev *pdev,
                goto fail_alloc_dma_buf;
        }
 
-       instance->pd_info = pci_alloc_consistent(pdev,
-               sizeof(struct MR_PD_INFO), &instance->pd_info_h);
+       if (!reset_devices) {
+               instance->system_info_buf = pci_zalloc_consistent(pdev,
+                                       sizeof(struct MR_DRV_SYSTEM_INFO),
+                                       &instance->system_info_h);
+               if (!instance->system_info_buf)
+                       dev_info(&instance->pdev->dev, "Can't allocate system info buffer\n");
+
+               instance->pd_info = pci_alloc_consistent(pdev,
+                       sizeof(struct MR_PD_INFO), &instance->pd_info_h);
 
-       if (!instance->pd_info)
-               dev_err(&instance->pdev->dev, "Failed to alloc mem for pd_info\n");
+               if (!instance->pd_info)
+                       dev_err(&instance->pdev->dev, "Failed to alloc mem for pd_info\n");
+
+               instance->crash_dump_buf = pci_alloc_consistent(pdev,
+                                               CRASH_DMA_BUF_SIZE,
+                                               &instance->crash_dump_h);
+               if (!instance->crash_dump_buf)
+                       dev_err(&pdev->dev, "Can't allocate Firmware "
+                               "crash dump DMA buffer\n");
+       }
 
        /*
         * Initialize locks and queues
@@ -7173,6 +7173,16 @@ static int __init megasas_init(void)
 {
        int rval;
 
+       /*
+        * Booted in kdump kernel, minimize memory footprints by
+        * disabling few features
+        */
+       if (reset_devices) {
+               msix_vectors = 1;
+               rdpq_enable = 0;
+               dual_qdepth_disable = 1;
+       }
+
        /*
         * Announce driver version and other information
         */