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[ Upstream commit f4b2fa2c25e1ade78f766aa82e733a0b5198d484 ] Improves handling of DMA ring overflow. Clarify other WDMA drop related comment. Signed-off-by: Felix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20221116080734.44013-3-nbd@nbd.name Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>