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authorAndrew Morton <akpm@osdl.org>2006-06-23 02:05:31 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 07:43:05 -0700
commit304c4c841a31c780a45d65e389b07706babf5d36 (patch)
treed5fed361a127e46c1a99d72ef907e1c6b03a1abe /fs/jbd
parent22722051fb6bcbb95c895e68dad10d34a9db7e4d (diff)
downloadop-kernel-dev-304c4c841a31c780a45d65e389b07706babf5d36.zip
op-kernel-dev-304c4c841a31c780a45d65e389b07706babf5d36.tar.gz
[PATCH] jbd: avoid kfree(NULL)
There are a couple of places where JBD has to check to see whether an unneeded memory allocation was performed. Usually it _was_ needed, so we end up calling kfree(NULL). We can micro-optimise that by checking the pointer before calling kfree(). Thanks to Steven Rostedt <rostedt@goodmis.org> for identifying this. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/jbd')
-rw-r--r--fs/jbd/transaction.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index ff75afe..508b2ea 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -227,7 +227,8 @@ repeat_locked:
spin_unlock(&transaction->t_handle_lock);
spin_unlock(&journal->j_state_lock);
out:
- kfree(new_transaction);
+ if (unlikely(new_transaction)) /* It's usually NULL */
+ kfree(new_transaction);
return ret;
}
@@ -724,7 +725,8 @@ done:
journal_cancel_revoke(handle, jh);
out:
- kfree(frozen_buffer);
+ if (unlikely(frozen_buffer)) /* It's usually NULL */
+ kfree(frozen_buffer);
JBUFFER_TRACE(jh, "exit");
return error;
@@ -903,7 +905,8 @@ repeat:
jbd_unlock_bh_state(bh);
out:
journal_put_journal_head(jh);
- kfree(committed_data);
+ if (unlikely(committed_data))
+ kfree(committed_data);
return err;
}
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