qla4xxx: check the return value of dma_alloc_coherent()

the qla4xxx_alloc_fw_dump() calls dma_alloc_coherent() but does not
check its return value.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Acked-By: Nilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_init.c b/drivers/scsi/qla4xxx/ql4_init.c
index 6f12f859b11d..4180d6d9fe78 100644
--- a/drivers/scsi/qla4xxx/ql4_init.c
+++ b/drivers/scsi/qla4xxx/ql4_init.c
@@ -334,6 +334,12 @@ void qla4xxx_alloc_fw_dump(struct scsi_qla_host *ha)
         /* Allocate memory for saving the template */
         md_tmp = dma_alloc_coherent(&ha->pdev->dev, ha->fw_dump_tmplt_size,
                                     &md_tmp_dma, GFP_KERNEL);
+        if (!md_tmp) {
+                ql4_printk(KERN_INFO, ha,
+                           "scsi%ld: Failed to allocate DMA memory\n",
+                           ha->host_no);
+                return;
+        }
 
         /* Request template */
         status =  qla4xxx_get_minidump_template(ha, md_tmp_dma);