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| author | Hans de Goede <hdegoede@redhat.com> | 2018-08-12 12:53:21 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-08-20 14:09:26 +0200 |
| commit | 0a30446c0dca3483c384b54a431cc951e15f7e79 (patch) | |
| tree | 712f90e320ee992bdc8d8f2a736958c6a7caa3d4 /drivers/i2c | |
| parent | c463a158cb6c5d9a85b7d894cd4f8116e8bd6be0 (diff) | |
| download | linux-0a30446c0dca3483c384b54a431cc951e15f7e79.tar.bz2 | |
i2c: core: ACPI: Make acpi_gsb_i2c_read_bytes() check i2c_transfer return value
Currently acpi_gsb_i2c_read_bytes() directly returns i2c_transfer's return
value. i2c_transfer returns a value < 0 on error and 2 (for 2 successfully
executed transfers) on success. But the ACPI code expects 0 on success, so
currently acpi_gsb_i2c_read_bytes()'s caller does:
if (status > 0)
status = 0;
This commit makes acpi_gsb_i2c_read_bytes() return a value which can be
directly consumed by the ACPI code, mirroring acpi_gsb_i2c_write_bytes(),
this commit also makes acpi_gsb_i2c_read_bytes() explitcly check that
i2c_transfer returns 2, rather then accepting any value > 0.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core-acpi.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index b8f303dea305..32affd3fa8bd 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -453,8 +453,12 @@ static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, else dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", data_len, client->addr, cmd, ret); - } else { + /* 2 transfers must have completed successfully */ + } else if (ret == 2) { memcpy(data, buffer, data_len); + ret = 0; + } else { + ret = -EIO; } kfree(buffer); @@ -595,8 +599,6 @@ i2c_acpi_space_handler(u32 function, acpi_physical_address command, if (action == ACPI_READ) { status = acpi_gsb_i2c_read_bytes(client, command, gsb->data, info->access_length); - if (status > 0) - status = 0; } else { status = acpi_gsb_i2c_write_bytes(client, command, gsb->data, info->access_length); |