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    Subject[patch 24/26] i2c-pasemi: Fix NACK detection
    2.6.22-stable review patch.  If anyone has any objections, please let us

    From: Jean Delvare <>

    patch be8a1f7cd4501c3b4b32543577a33aee6d2193ac in mainline.

    Turns out we don't actually check the status to see if there was a
    device out there to talk to, just if we had a timeout when doing so.

    Add the proper check, so we don't falsly think there are devices
    on the bus that are not there, etc.

    Signed-off-by: Olof Johansson <>
    Signed-off-by: Jean Delvare <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/i2c/busses/i2c-pasemi.c | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/drivers/i2c/busses/i2c-pasemi.c
    +++ b/drivers/i2c/busses/i2c-pasemi.c
    @@ -51,6 +51,7 @@ struct pasemi_smbus {
    #define MRXFIFO_DATA_M 0x000000ff

    #define SMSTA_XEN 0x08000000
    +#define SMSTA_MTN 0x00200000

    #define CTL_MRR 0x00000400
    #define CTL_MTR 0x00000200
    @@ -98,6 +99,10 @@ static unsigned int pasemi_smb_waitready
    status = reg_read(smbus, REG_SMSTA);

    + /* Got NACK? */
    + if (status & SMSTA_MTN)
    + return -ENXIO;
    if (timeout < 0) {
    dev_warn(&smbus->dev->dev, "Timeout, status 0x%08x\n", status);
    reg_write(smbus, REG_SMSTA, status);
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      Last update: 2007-11-19 19:33    [W:0.019 / U:77.988 seconds]
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