linux-kernel - [PATCH 12/12] HID: i2c-hid: note that I2C xfer buffers are DMA-safe

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Message-Id: <20220118072628.1617172-13-dmitry.torokhov@gmail.com>
Date:   Mon, 17 Jan 2022 23:26:28 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Angela Czubak <acz@...ihalf.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 12/12] HID: i2c-hid: note that I2C xfer buffers are DMA-safe

All I2C communications in the driver use driver-private buffers that are
DMA-safe, so mark them as such.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/hid/i2c-hid/i2c-hid-core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index aa7c573b35bc..92dd86c42975 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -180,7 +180,7 @@ static int i2c_hid_xfer(struct i2c_hid *ihid,
 			    __func__, send_len, send_buf);
 
 		msgs[n].addr = client->addr;
-		msgs[n].flags = client->flags & I2C_M_TEN;
+		msgs[n].flags = (client->flags & I2C_M_TEN) | I2C_M_DMA_SAFE;
 		msgs[n].len = send_len;
 		msgs[n].buf = send_buf;
 		n++;
@@ -188,7 +188,8 @@ static int i2c_hid_xfer(struct i2c_hid *ihid,
 
 	if (recv_len) {
 		msgs[n].addr = client->addr;
-		msgs[n].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
+		msgs[n].flags = (client->flags & I2C_M_TEN) |
+				I2C_M_RD | I2C_M_DMA_SAFE;
 		msgs[n].len = recv_len;
 		msgs[n].buf = recv_buf;
 		n++;
-- 
2.34.1.703.g22d0c6ccf7-goog