[SCSI] megaraid_sas: Fix the frame count calculation

When Driver sent wrong frame count to firmware.  As this particular
command is sent to drive, FW is seeing continuous chip resets and so
the command will timeout.

Signed-off-by Bo Yang<bo.yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 21 insertions, 10 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 4014225300a0..ffd1390b155b 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -488,12 +488,13 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
 
  /**
  * megasas_get_frame_count - Computes the number of frames
+ * @frame_type		: type of frame- io or pthru frame
  * @sge_count		: number of sg elements
  *
  * Returns the number of frames required for numnber of sge's (sge_count)
  */
 
-static u32 megasas_get_frame_count(u8 sge_count)
+static u32 megasas_get_frame_count(u8 sge_count, u8 frame_type)
 {
 	int num_cnt;
 	int sge_bytes;
@@ -504,13 +505,22 @@ static u32 megasas_get_frame_count(u8 sge_count)
 	    sizeof(struct megasas_sge32);
 
 	/*
-	* Main frame can contain 2 SGEs for 64-bit SGLs and
-	* 3 SGEs for 32-bit SGLs
-	*/
-	if (IS_DMA64)
-		num_cnt = sge_count - 2;
-	else
-		num_cnt = sge_count - 3;
+	 * Main frame can contain 2 SGEs for 64-bit SGLs and
+	 * 3 SGEs for 32-bit SGLs for ldio &
+	 * 1 SGEs for 64-bit SGLs and
+	 * 2 SGEs for 32-bit SGLs for pthru frame
+	 */
+	if (unlikely(frame_type == PTHRU_FRAME)) {
+		if (IS_DMA64)
+			num_cnt = sge_count - 1;
+		else
+			num_cnt = sge_count - 2;
+	} else {
+		if (IS_DMA64)
+			num_cnt = sge_count - 2;
+		else
+			num_cnt = sge_count - 3;
+	}
 
 	if(num_cnt>0){
 		sge_bytes = sge_sz * num_cnt;
@@ -592,7 +602,8 @@ megasas_build_dcdb(struct megasas_instance *instance, struct scsi_cmnd *scp,
 	 * Compute the total number of frames this command consumes. FW uses
 	 * this number to pull sufficient number of frames from host memory.
 	 */
-	cmd->frame_count = megasas_get_frame_count(pthru->sge_count);
+	cmd->frame_count = megasas_get_frame_count(pthru->sge_count,
+							PTHRU_FRAME);
 
 	return cmd->frame_count;
 }
@@ -709,7 +720,7 @@ megasas_build_ldio(struct megasas_instance *instance, struct scsi_cmnd *scp,
 	 * Compute the total number of frames this command consumes. FW uses
 	 * this number to pull sufficient number of frames from host memory.
 	 */
-	cmd->frame_count = megasas_get_frame_count(ldio->sge_count);
+	cmd->frame_count = megasas_get_frame_count(ldio->sge_count, IO_FRAME);
 
 	return cmd->frame_count;
 }