[PATCH 4.13 060/109] scsi: megaraid_sas: mismatch of allocated MFI frame size and length exposed in MFI MPT pass through command

Greg Kroah-Hartman
2017-09-24T20:42:28Z

From: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>

commit ed2983f458bed9dc827ec60c8486253b1669bb52 upstream.

Driver allocated 256 byte MFI frames bytes but while sending MFI frame
(embedded inside chain frame of MPT frame) to firmware, driver sets the
length as 4k. This results in DMA read error messages during boot.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/megaraid/megaraid_sas_fusion.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -3287,7 +3287,7 @@ build_mpt_mfi_pass_thru(struct megasas_i
mpi25_ieee_chain->Flags = IEEE_SGE_FLAGS_CHAIN_ELEMENT |
MPI2_IEEE_SGE_FLAGS_IOCPLBNTA_ADDR;

- mpi25_ieee_chain->Length = cpu_to_le32(instance->max_chain_frame_sz);
+ mpi25_ieee_chain->Length = cpu_to_le32(instance->mfi_frame_size);
}

/**