• Cindy H Kao's avatar
    wimax/i2400m: add the error recovery mechanism on TX path · 599e5953
    Cindy H Kao authored
    This patch adds an error recovery mechanism on TX path.
    The intention is to bring back the device to some known state
    whenever TX sees -110 (-ETIMEOUT) on copying the data to the HW FIFO.
    
    The TX failure could mean a device bus stuck or function stuck, so
    the current error recovery implementation is to trigger a bus reset
    and expect this can bring back the device.
    
    Since the TX work is done in a thread context, there may be a queue of TX works
    already that all hit the -ETIMEOUT error condition because the device has
    somewhat stuck already. We don't want any consecutive bus resets simply because
    multiple TX works in the queue all hit the same device erratum, the flag
    "error_recovery" is introduced to denote if we are ready for taking any
    error recovery. See @error_recovery doc in i2400m.h.
    Signed-off-by: default avatarCindy H Kao <cindy.h.kao@intel.com>
    599e5953
sdio-tx.c 5.52 KB