AGP fix race condition between unmapping and freeing pages

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With Andi's clflush fixup, we were getting hangs on server exit, flushing the
mappings after freeing each page helped.

This showed up a race condition where the pages after being freed could be
reused before the agp mappings had been flushed.  Flushing after each single
page is a bad thing for future drm work, so make the page destroy a two pass
unmapping all the pages, flushing the mappings, and then destroying the pages.

Signed-off-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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This commit is contained in:

Dave Airlie 2007-10-15 10:19:16 +10:00 • committed by Dave Airlie

parent 23fd50450a

commit a2721e998e

6 changed files with 48 additions and 27 deletions

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7

drivers/char/agp/agp.h

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27

drivers/char/agp/ali-agp.c

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12

drivers/char/agp/backend.c

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19

drivers/char/agp/generic.c

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4

drivers/char/agp/i460-agp.c

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6

drivers/char/agp/intel-agp.c

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