From: Alex Elder <elder@linaro.org>
Date: Sun, 22 May 2022 00:32:23 +0000 (-0500)
Subject: net: ipa: use data space for command opcodes
X-Git-Tag: xarray-6.0~354^2~23^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a224bd4b88caa3ac62a4b541a07fae7ea26cab7a;p=users%2Fwilly%2Fxarray.git

net: ipa: use data space for command opcodes

The 64-bit data field in a transaction is not used for commands.
And the opcode array is *only* used for commands.  They're
(currently) the same size; save a little space in the transaction
structure by enclosing the two fields in a union.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ipa/gsi_trans.h b/drivers/net/ipa/gsi_trans.h
index 99ce2cba0dc3..020c3b32de1d 100644
--- a/drivers/net/ipa/gsi_trans.h
+++ b/drivers/net/ipa/gsi_trans.h
@@ -60,8 +60,10 @@ struct gsi_trans {
 	u8 used;			/* # entries used in sgl[] */
 	u32 len;			/* total # bytes across sgl[] */
 
-	void *data;
-	u8 cmd_opcode[IPA_COMMAND_TRANS_TRE_MAX];
+	union {
+		void *data;
+		u8 cmd_opcode[IPA_COMMAND_TRANS_TRE_MAX];
+	};
 	struct scatterlist *sgl;
 	enum dma_data_direction direction;