• John W. Linville's avatar
    ssb: do not read SPROM if it does not exist · d53cdbb9
    John W. Linville authored
    Attempting to read registers that don't exist on the SSB bus can cause
    hangs on some boxes.  At least some b43 devices are 'in the wild' that
    don't have SPROMs at all.  When the SSB bus support loads, it attempts
    to read these (non-existant) SPROMs and causes hard hangs on the box --
    no console output, etc.
    
    This patch adds some intelligence to determine whether or not the SPROM
    is present before attempting to read it.  This avoids those hard hangs
    on those devices with no SPROM attached to their SSB bus.  The
    SSB-attached devices (e.g. b43, et al.) won't work, but at least the box
    will survive to test further patches. :-)
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    Signed-off-by: default avatarRafał Miłecki <zajec5@gmail.com>
    Cc: Larry Finger <Larry.Finger@lwfinger.net>
    Cc: Michael Buesch <mb@bu3sch.de>
    d53cdbb9
sprom.c 4.93 KB