linux-kernel - Applied "regmap: drop cache if the bus transfer error" to the regmap tree

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Message-Id: <E1baKOD-00024k-HI@debutante>
Date:	Thu, 18 Aug 2016 11:17:33 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Elaine Zhang <zhangqing@...k-chips.com>
Cc:	Mark Brown <broonie@...nel.org>, heiko@...ech.de,
	huangtao@...k-chips.com, zyw@...k-chips.com, xxx@...k-chips.com,
	jay.xu@...k-chips.com, linux-kernel@...r.kernel.org
Subject: Applied "regmap: drop cache if the bus transfer error" to the regmap tree

The patch

   regmap: drop cache if the bus transfer error

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 815806e39bf6f7e7b34875d4a9609dbe76661782 Mon Sep 17 00:00:00 2001
From: Elaine Zhang <zhangqing@...k-chips.com>
Date: Thu, 18 Aug 2016 17:01:55 +0800
Subject: [PATCH] regmap: drop cache if the bus transfer error

regmap_write
->_regmap_raw_write
-->regcache_write first and than use map->bus->write to wirte i2c or spi
But if the i2c or spi transfer failed, But the cache is updated, So if I use
regmap_read will get the cache data which is not the real register value.

Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/base/regmap/regmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 51fa7d66a393..25d26bb18970 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1474,6 +1474,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
 		ret = map->bus->write(map->bus_context, buf, len);
 
 		kfree(buf);
+	} else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
+		regcache_drop_region(map, reg, reg + 1);
 	}
 
 	trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
-- 
2.8.1