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    usb: cdc-acm: drain writes on close · e5fbab51
    David Brownell 提交于
    Add a mechanism to let the write queue drain naturally before
    closing the TTY, rather than always losing that data.  There
    is a timeout, so it can't wait too long.
    
    Provide missing locking inside acm_wb_is_avail(); it matters
    more now.  Note, this presumes an earlier patch was applied,
    removing a call to this routine where the lock was held.
    
    Slightly improved diagnostics on write URB completion, so we
    can tell when a write URB gets killed and, if so, how much
    data it wrote first ... and so that I/O path is normally
    silent (and can't much change timings).
    Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
    Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
    e5fbab51
cdc-acm.c 38.1 KB