--- drivers/scsi/mpt2sas/mpt2sas_scsih.c

+++ drivers/scsi/mpt2sas/mpt2sas_scsih.c

@@ -945,7 +945,7 @@ _scsih_build_scatter_gather(struct MPT2S

u32 chain_offset;

u32 chain_length;

u32 chain_flags;

- u32 sges_left;

+ int sges_left;

u32 sges_in_segment;

u32 sgl_flags;

u32 sgl_flags_last_element;

@@ -966,7 +966,7 @@ _scsih_build_scatter_gather(struct MPT2S

sg_scmd = scsi_sglist(scmd);

sges_left = scsi_dma_map(scmd);

- if (!sges_left) {

+ if (sges_left < 0) {

sdev_printk(KERN_ERR, scmd->device, "pci_map_sg"

" failed: request for %d bytes!\n", scsi_bufflen(scmd));

return -ENOMEM;