staging: fsl-mc: use generic memory barriers

No need to use arch-specific memory barriers; switch to using generic
ones. The rmb()s were useless so drop them.
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/mc-sys.c

@@ -127,7 +127,8 @@ static inline void mc_write_command(struct mc_command __iomem *portal,
 	/* copy command parameters into the portal */
 	for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
 		__raw_writeq(cmd->params[i], &portal->params[i]);
-	__iowmb();
+	/* ensure command params are committed before submitting it */
+	wmb();
 
 	/* submit the command by writing the header */
 	__raw_writeq(cmd->header, &portal->header);
@@ -150,9 +151,7 @@ static inline enum mc_cmd_status mc_read_response(struct mc_command __iomem *
 	enum mc_cmd_status status;
 
 	/* Copy command response header from MC portal: */
-	__iormb();
 	resp->header = __raw_readq(&portal->header);
-	__iormb();
 	status = mc_cmd_hdr_read_status(resp);
 	if (status != MC_CMD_STATUS_OK)
 		return status;
@@ -160,7 +159,6 @@ static inline enum mc_cmd_status mc_read_response(struct mc_command __iomem *
 	/* Copy command response data from MC portal: */
 	for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
 		resp->params[i] = __raw_readq(&portal->params[i]);
-	__iormb();
 
 	return status;
 }