On Fri, 16 Feb 2018 23:05:33 +0000 Michael Kelley <mhkelley@xxxxxxxxxxx> wrote: > Fix bugs in signaling the Hyper-V host when freeing space in the > host->guest ring buffer: > > 1. The interrupt_mask must not be used to determine whether to signal > on the host->guest ring buffer > 2. The ring buffer write_index must be read (via hv_get_bytes_to_write) > *after* pending_send_sz is read in order to avoid a race condition > 3. Comparisons with pending_send_sz must treat the "equals" case as > not-enough-space > 4. Don't signal if the pending_send_sz feature is not present. Older > versions of Hyper-V that don't implement this feature will poll. > > Fixes: 03bad714a161 ("vmbus: more host signalling avoidance") > Signed-off-by: Michael Kelley <mhkelley@xxxxxxxxxxx> Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx> _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel