> + /* check the 'N' bit in word 0 of the FIS */
> + if (f[0] & (1 << 15)) {
> + int port_addr = ((f[0] & 0x00000f00) >> 8);
> + struct ata_device *adev = &ap->device[port_addr];
You can't be sure that the port_addr returned will be in range if a
device is malfunctioning...
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