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drm/i915: Avoid potential sleep whilst holding spinlock 

Miles Lane reported the following error:
2 locks held by cat/4179:
  #0:  (&p->lock){+.+.+.}, at: [<c10a3884>] seq_read+0x25/0x315
  #1:  (&dev_priv->mm.active_list_lock){+.+...}, at: [<c119a854>]
i915_batchbuffer_info+0x2b/0x124
Pid: 4179, comm: cat Not tainted 2.6.32-rc5-git1 #2
Call Trace:
  [<c104874f>] ? __debug_show_held_locks+0x1e/0x20
  [<c1023fb0>] __might_sleep+0xf0/0xf7
  [<c101c393>] kmap+0x17/0x58
  [<c119a8d6>] i915_batchbuffer_info+0xad/0x124
  [<c10a39bf>] seq_read+0x160/0x315
  [<c108fb8c>] ? rw_verify_area+0x98/0xbb
  [<c10a385f>] ? seq_read+0x0/0x315
  [<c1090331>] vfs_read+0x75/0xa9
  [<c10903f9>] sys_read+0x3b/0x5d
  [<c1002a8f>] sysenter_do_call+0x12/0x36

The fix is relatively simple, use the atomic variants of kmap() that
avoid the potential sleep.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2009-10-20 16:29:16 +00:00 committed by Eric Anholt
parent 9a6fc8d0f8
commit ba86bf8bfc
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_debugfs.c
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@ -267,10 +267,10 @@ static void i915_dump_pages(struct seq_file *m, struct page **pages, int page_co
uint32_t *mem;
for (page = 0; page < page_count; page++) {
mem = kmap(pages[page]);
mem = kmap_atomic(pages[page], KM_USER0);
for (i = 0; i < PAGE_SIZE; i += 4)
seq_printf(m, "%08x : %08x\n", i, mem[i / 4]);
kunmap(pages[page]);
kunmap_atomic(pages[page], KM_USER0);
}
}