linux-kernel - [PATCH v2 2/3] i2c: atr: Allow unmapped addresses from nested ATRs

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Message-Id: <20241122-i2c-atr-fixes-v2-2-0acd325b6916@ideasonboard.com>
Date: Fri, 22 Nov 2024 14:26:19 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Wolfram Sang <wsa+renesas@...g-engineering.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Wolfram Sang <wsa@...nel.org>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Cosmin Tanislav <demonsingur@...il.com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: [PATCH v2 2/3] i2c: atr: Allow unmapped addresses from nested ATRs

From: Cosmin Tanislav <demonsingur@...il.com>

i2c-atr translates the i2c transactions and forwards them to its parent
i2c bus. Any transaction to an i2c address that has not been mapped on
the i2c-atr will be rejected with an error.

However, if the parent i2c bus is another i2c-atr, the parent i2c-atr
gets a transaction to an i2c address that is not mapped in the parent
i2c-atr, and thus fails.

Relax the checks, and allow non-mapped transactions to fix this issue.

Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
---
 drivers/i2c/i2c-atr.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
index 0d54d0b5e327..5adb720af84e 100644
--- a/drivers/i2c/i2c-atr.c
+++ b/drivers/i2c/i2c-atr.c
@@ -134,7 +134,6 @@ i2c_atr_find_mapping_by_addr(const struct list_head *list, u16 phys_addr)
 static int i2c_atr_map_msgs(struct i2c_atr_chan *chan, struct i2c_msg *msgs,
 			    int num)
 {
-	struct i2c_atr *atr = chan->atr;
 	static struct i2c_atr_alias_pair *c2a;
 	int i;
 
@@ -157,15 +156,8 @@ static int i2c_atr_map_msgs(struct i2c_atr_chan *chan, struct i2c_msg *msgs,
 
 		c2a = i2c_atr_find_mapping_by_addr(&chan->alias_list,
 						   msgs[i].addr);
-		if (!c2a) {
-			dev_err(atr->dev, "client 0x%02x not mapped!\n",
-				msgs[i].addr);
-
-			while (i--)
-				msgs[i].addr = chan->orig_addrs[i];
-
-			return -ENXIO;
-		}
+		if (!c2a)
+			continue;
 
 		msgs[i].addr = c2a->alias;
 	}

-- 
2.43.0