• Michael Chan's avatar
    bnx2: Add workaround to handle missed MSI. · efba0180
    Michael Chan authored
    The bnx2 chips do not support per MSI vector masking.  On 5706/5708, new MSI
    address/data are stored only when the MSI enable bit is toggled.  As a result,
    SMP affinity no longer works in the latest kernel.  A more serious problem is
    that the driver will no longer receive interrupts when the MSI receiving CPU
    goes offline.
    
    The workaround in this patch only addresses the problem of CPU going offline.
    When that happens, the driver's timer function will detect that it is making
    no forward progress on pending interrupt events and will recover from it.
    
    Eric Dumazet reported the problem.
    
    We also found that if an interrupt is internally asserted while MSI and INTA
    are disabled, the chip will end up in the same state after MSI is re-enabled.
    The same workaround is needed for this problem. 
    Signed-off-by: default avatarMichael Chan <mchan@broadcom.com>
    Tested-by: default avatarEric Dumazet <dada1@cosmosbay.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    efba0180
bnx2.c 192 KB