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From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-i2c@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-iio@vger.kernel.org, linux-input@vger.kernel.org,
	linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Wolfram Sang <wsa+renesas@sang-engineering.com>
Subject: [RFC PATCH v5 6/6] i2c: dev: mark RDWR buffers as DMA_SAFE
Date: Wed, 20 Sep 2017 20:59:56 +0200	[thread overview]
Message-ID: <20170920185956.13874-7-wsa+renesas@sang-engineering.com> (raw)
In-Reply-To: <20170920185956.13874-1-wsa+renesas@sang-engineering.com>

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/i2c/i2c-dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index 6f638bbc922db4..bbc7aadb4c899d 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -280,6 +280,8 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
 			res = PTR_ERR(rdwr_pa[i].buf);
 			break;
 		}
+		/* memdup_user allocates with GFP_KERNEL, so DMA is ok */
+		rdwr_pa[i].flags |= I2C_M_DMA_SAFE;
 
 		/*
 		 * If the message length is received from the slave (similar
-- 
2.11.0

  parent reply	other threads:[~2017-09-20 19:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-20 18:59 [RFC PATCH v5 0/6] i2c: document DMA handling and add helpers for it Wolfram Sang
2017-09-20 18:59 ` [RFC PATCH v5 1/6] i2c: add a message flag for DMA safe buffers Wolfram Sang
2017-09-20 18:59 ` [RFC PATCH v5 2/6] i2c: add helpers to ease DMA handling Wolfram Sang
2017-09-21 13:59   ` Jonathan Cameron
2017-09-21 13:59     ` Jonathan Cameron
2017-09-21 14:05     ` Jonathan Cameron
2017-09-21 14:05       ` Jonathan Cameron
2017-09-21 14:15       ` Wolfram Sang
2017-09-21 14:36         ` Jonathan Cameron
2017-09-21 14:36           ` Jonathan Cameron
2017-09-20 18:59 ` [RFC PATCH v5 3/6] i2c: add docs to clarify " Wolfram Sang
2017-09-20 19:56   ` Mauro Carvalho Chehab
2017-09-21 14:08     ` Jonathan Cameron
2017-09-21 14:08       ` Jonathan Cameron
2017-09-20 18:59 ` [RFC PATCH v5 4/6] i2c: sh_mobile: use helper to decide if DMA is useful Wolfram Sang
2017-09-20 18:59 ` [RFC PATCH v5 5/6] i2c: rcar: skip DMA if buffer is not safe Wolfram Sang
2017-09-20 18:59 ` Wolfram Sang [this message]
2017-09-21 14:17   ` [RFC PATCH v5 6/6] i2c: dev: mark RDWR buffers as DMA_SAFE Jonathan Cameron
2017-09-21 14:17     ` Jonathan Cameron
2017-09-21 14:23     ` Wolfram Sang

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