Dave Jiang 4dec23d771 ioatdma: fix race between updating ioat->head and IOAT_COMPLETION_PENDING ... There is a race that can hit during __cleanup() when the ioat->head pointer is incremented during descriptor submission. The __cleanup() can clear the PENDING flag when it does not see any active descriptors. This causes new submitted descriptors to be ignored because the COMPLETION_PENDING flag is cleared. This was introduced when code was adapted from ioatdma v1 to ioatdma v2. For v2 and v3, IOAT_COMPLETION_PENDING flag will be abandoned and a new flag IOAT_CHAN_ACTIVE will be utilized. This flag will also be protected under the prep_lock when being modified in order to avoid the race. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Dan Williams <djbw@fb.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>		2013-02-12 08:27:21 -08:00
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dca.c	ioat: Do not enable DCA if tag map is invalid	2012-11-15 05:20:01 -08:00
dma.c	ioat: add missing DMA unmap to ioat_dma_self_test()	2013-01-07 22:04:58 -08:00
dma.h	ioatdma: fix race between updating ioat->head and IOAT_COMPLETION_PENDING	2013-02-12 08:27:21 -08:00
dma_v2.c	ioatdma: fix race between updating ioat->head and IOAT_COMPLETION_PENDING	2013-02-12 08:27:21 -08:00
dma_v2.h	ioat: ring size variables need to be 32bit to avoid overflow	2012-04-05 15:22:58 -07:00
dma_v3.c	ioatdma: fix race between updating ioat->head and IOAT_COMPLETION_PENDING	2013-02-12 08:27:21 -08:00
hw.h	ioat: Add alignment workaround for IVB platforms	2013-01-07 22:05:13 -08:00
Makefile	drivers/dma/ioat: Use the ccflag-y instead of EXTRA_CFLAGS	2010-12-04 15:03:06 -08:00
pci.c	ioat: Add alignment workaround for IVB platforms	2013-01-07 22:05:13 -08:00
registers.h