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authorWolfram Sang <wsa+renesas@sang-engineering.com>2015-07-17 15:48:56 +0300
committerWolfram Sang <wsa@the-dreams.de>2015-08-24 15:05:14 +0300
commit9bccc70a127cfe2a13e34d6b6e7300caae113f8f (patch)
treeda17b6a3de9f47c5affd0b685b69524a67fd03f6 /drivers/i2c/i2c-core.c
parentb4e2f6ac1281cd3e066919cc762eef4924e9fcc5 (diff)
downloadlinux-9bccc70a127cfe2a13e34d6b6e7300caae113f8f.tar.xz
i2c: take address space into account when checking for used addresses
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@mail.ru> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/i2c-core.c')
-rw-r--r--drivers/i2c/i2c-core.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7b18f31bf6c6..fc6d89316144 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -839,7 +839,7 @@ 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;
}
@@ -993,7 +993,7 @@ 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;
@@ -2315,7 +2315,7 @@ 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;
@@ -2431,7 +2431,7 @@ 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]);