From: Dan Williams Date: Fri, 18 Jul 2008 00:59:55 +0000 (-0700) Subject: async_tx: fix handling of the "out of descriptor" condition in async_xor X-Git-Tag: v2.6.27-rc1~852^2~9 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=669ab0b210f9bd15d94d4d6a49ae13366a85e4da;p=pandora-kernel.git async_tx: fix handling of the "out of descriptor" condition in async_xor Ensure forward progress is made when a dmaengine driver is unable to allocate an xor descriptor by breaking the dependency chain with async_tx_quisce() and issue any pending descriptors. Tested with iop-adma by setting device->max_xor = 2 to force multiple calls to device_prep_dma_xor for each call to async_xor and limiting the descriptor slot pool to 5. Discovered that the minimum descriptor pool size for iop-adma is 2 * iop_chan_xor_slot_cnt(device->max_xor) + 1. Signed-off-by: Dan Williams --- Reading git-diff-tree failed