• James Smart's avatar
    scsi: lpfc: Fix oops when fewer hdwqs than cpus · 3ad348d9
    James Smart authored
    When tearing down the adapter for a reset, online/offline, or driver
    unload, the queue free routine would hit a GPF oops.  This only occurs on
    conditions where the number of hardware queues created is fewer than the
    number of cpus in the system. In this condition cpus share a hardware
    queue. And of course, it's the 2nd cpu that shares a hardware that
    attempted to free it a second time and hit the oops.
    
    Fix by reworking the cpu to hardware queue mapping such that:
    Assignment of hardware queues to cpus occur in two passes:
    first pass: is first time assignment of a hardware queue to a cpu.
      This will set the LPFC_CPU_FIRST_IRQ flag for the cpu.
    second pass: for cpus that did not get a hardware queue they will
      be assigned one from a primary cpu (one set in first pass).
    
    Deletion of hardware queues is driven by cpu itteration, and queues
    will only be deleted if the LPFC_CPU_FIRST_IRQ flag is set.
    
    Also contains a few small cleanup fixes and a little better logging.
    Signed-off-by: default avatarDick Kennedy <dick.kennedy@broadcom.com>
    Signed-off-by: default avatarJames Smart <jsmart2021@gmail.com>
    Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
    3ad348d9
lpfc_init.c 396 KB