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OpenCloudOS-Kernel
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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>
This commit is contained in:
Wolfram Sang 2015-07-17 14:48:56 +02:00 committed by Wolfram Sang
parent b4e2f6ac12
commit 9bccc70a12
1 changed files with 4 additions and 4 deletions
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8
drivers/i2c/i2c-core.c
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@ -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]);