diff options
| author |   Jack Steiner <steiner@sgi.com> | 2009-12-15 16:48:02 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:14 -0800 |
| commit | 091f1a10614db89a108cda980425799730d73d8a (patch) | |
| tree | 1564f5eec330225cc652c9c89209d84898a7c653 /drivers/misc | |
| parent | gru: initial GRU based on blade topology (diff) | |
| download | linux-dev-091f1a10614db89a108cda980425799730d73d8a.tar.xz linux-dev-091f1a10614db89a108cda980425799730d73d8a.zip | |
gru: add comments raised in previous code reviews
Add comments from previous code reviews. The comments help explain some
of the more esoteric aspects of the driver.
Move a free() to the other side of an unlock.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/sgi-gru/grufault.c | 5 | ||||
| -rw-r--r-- | drivers/misc/sgi-gru/grukservices.c | 4 |
2 files changed, 8 insertions, 1 deletions
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c index 679e01778286..2605edfbaebe 100644 --- a/drivers/misc/sgi-gru/grufault.c +++ b/drivers/misc/sgi-gru/grufault.c @@ -733,6 +733,11 @@ long gru_get_gseg_statistics(unsigned long arg) if (copy_from_user(&req, (void __user *)arg, sizeof(req))) return -EFAULT; + /* + * The library creates arrays of contexts for threaded programs. + * If no gts exists in the array, the context has never been used & all + * statistics are implicitly 0. + */ gts = gru_find_lock_gts(req.gseg); if (gts) { memcpy(&req.stats, >s->ustats, sizeof(gts->ustats)); diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c index d2b149facda1..306855cc80fe 100644 --- a/drivers/misc/sgi-gru/grukservices.c +++ b/drivers/misc/sgi-gru/grukservices.c @@ -200,13 +200,15 @@ static int gru_free_kernel_contexts(void) bs = gru_base[bid]; if (!bs) continue; + + /* Ignore busy contexts. Don't want to block here. */ if (down_write_trylock(&bs->bs_kgts_sema)) { kgts = bs->bs_kgts; if (kgts && kgts->ts_gru) gru_unload_context(kgts, 0); - kfree(kgts); bs->bs_kgts = NULL; up_write(&bs->bs_kgts_sema); + kfree(kgts); } else { ret++; } |