[SCSI] mpt2sas: add missing allocation check

The __get_free_pages can fail, so the return value should be checked.
Spotted thanks to Stanislaw.

Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Acked-by: "Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index a78036f5e1a6..82fa6ce481f0 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -2575,6 +2575,11 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc,  int sleep_flag)
 
         ioc->chain_lookup = (struct chain_tracker *)__get_free_pages(
             GFP_KERNEL, ioc->chain_pages);
+        if (!ioc->chain_lookup) {
+                printk(MPT2SAS_ERR_FMT "chain_lookup: get_free_pages failed, "
+                    "sz(%d)\n", ioc->name, (int)sz);
+                goto out;
+        }
         ioc->chain_dma_pool = pci_pool_create("chain pool", ioc->pdev,
             ioc->request_sz, 16, 0);
         if (!ioc->chain_dma_pool) {