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cb710: use SG_MITER_TO_SG/SG_MITER_FROM_SG

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the code allready uses flush_kernel_dcache_page(). This patch updates the
driver to the recent sg API changes which require that either SG_MITER_TO_SG
or SG_MITER_FROM_SG is set. SG_MITER_TO_SG calls flush_kernel_dcache_page()
in sg_mitter_stop()

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Acked-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
This commit is contained in:
Sebastian Andrzej Siewior 2009-06-22 09:18:05 +02:00 • committed by Pierre Ossman
parent da60a91d01
commit 4b2a108cd0
3 changed files with 6 additions and 33 deletions
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29
include/linux/cb710.h
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@ -140,29 +140,6 @@ void cb710_dump_regs(struct cb710_chip *chip, unsigned dump);
#include <linux/highmem.h>
#include <linux/scatterlist.h>
/**
* cb710_sg_miter_stop_writing - stop mapping iteration after writing
* @miter: sg mapping iter to be stopped
*
* Description:
* Stops mapping iterator @miter. @miter should have been started
* started using sg_miter_start(). A stopped iteration can be
* resumed by calling sg_miter_next() on it. This is useful when
* resources (kmap) need to be released during iteration.
*
* This is a convenience wrapper that will be optimized out for arches
* that don't need flush_kernel_dcache_page().
*
* Context:
* IRQ disabled if the SG_MITER_ATOMIC is set. Don't care otherwise.
*/
static inline void cb710_sg_miter_stop_writing(struct sg_mapping_iter *miter)
{
if (miter->page)
flush_kernel_dcache_page(miter->page);
sg_miter_stop(miter);
}
/*
* 32-bit PIO mapping sg iterator
*
@ -171,12 +148,12 @@ static inline void cb710_sg_miter_stop_writing(struct sg_mapping_iter *miter)
* without DMA support).
*
* Best-case reading (transfer from device):
* sg_miter_start();
* sg_miter_start(, SG_MITER_TO_SG);
* cb710_sg_dwiter_write_from_io();
* cb710_sg_miter_stop_writing();
* sg_miter_stop();
*
* Best-case writing (transfer to device):
* sg_miter_start();
* sg_miter_start(, SG_MITER_FROM_SG);
* cb710_sg_dwiter_read_to_io();
* sg_miter_stop();
*/