From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
It is not enough to compare the plain address value, we also need to
check the flags enabling a different address space. E.g. it is valid to
have address 0x50 as a 7-bit address and 0x050 as 10-bit address on the
same bus. Same for addresses when we are the slave.
Tested-by: Andrey Danin <danindrey@xxxxxxx>
Acked-by: Stephen Warren <swarren@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7638eb1a5998f8..24c96dd0a5bee4 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -837,7 +837,7 @@ static int __i2c_check_addr_busy(struct device *dev, void *addrp)
struct i2c_client *client = i2c_verify_client(dev);
int addr = *(int *)addrp;
- if (client && client->addr == addr)
+ if (client && i2c_encode_flags_to_addr(client) == addr)
return -EBUSY;
return 0;
}
@@ -991,7 +991,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
}
/* Check for address business */
- status = i2c_check_addr_busy(adap, client->addr);
+ status = i2c_check_addr_busy(adap, i2c_encode_flags_to_addr(client));
if (status)
goto out_err;
@@ -2287,7 +2287,7 @@ static int i2c_detect_address(struct i2c_client *temp_client,
return err;
}
- /* Skip if already in use */
+ /* Skip if already in use (7 bit, no need to encode flags) */
if (i2c_check_addr_busy(adapter, addr))
return 0;
@@ -2403,7 +2403,7 @@ i2c_new_probed_device(struct i2c_adapter *adap,
continue;
}
- /* Check address availability */
+ /* Check address availability (7 bit, no need to encode flags) */
if (i2c_check_addr_busy(adap, addr_list[i])) {
dev_dbg(&adap->dev, "Address 0x%02x already in "
"use, not probing\n", addr_list[i]);
--
2.1.4
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