Messages in this thread Patch in this message | | | Date | Tue, 19 Apr 2016 21:17:25 -0700 | From | Davidlohr Bueso <> | Subject | [PATCH -tip v3 3/3] locking/pvqspinlock: Robustify init_qspinlock_stat() |
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locking/pvqspinlock: Robustify init_qspinlock_stat()
Specifically around the debugfs file creation calls, I have no idea if they could ever possibly fail, but this is core code (debug aside) so lets at least check the return value and inform anything fishy.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de> --- kernel/locking/qspinlock_stat.h | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/kernel/locking/qspinlock_stat.h b/kernel/locking/qspinlock_stat.h index 72722334237a..22e025309845 100644 --- a/kernel/locking/qspinlock_stat.h +++ b/kernel/locking/qspinlock_stat.h @@ -212,10 +212,8 @@ static int __init init_qspinlock_stat(void) struct dentry *d_qstat = debugfs_create_dir("qlockstat", NULL); int i; - if (!d_qstat) { - pr_warn("Could not create 'qlockstat' debugfs directory\n"); - return 0; - } + if (!d_qstat) + goto out; /* * Create the debugfs files @@ -225,12 +223,20 @@ static int __init init_qspinlock_stat(void) * performance. */ for (i = 0; i < qstat_num; i++) - debugfs_create_file(qstat_names[i], 0400, d_qstat, - (void *)(long)i, &fops_qstat); + if (!debugfs_create_file(qstat_names[i], 0400, d_qstat, + (void *)(long)i, &fops_qstat)) + goto fail_undo; + + if (!debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat, + (void *)(long)qstat_reset_cnts, &fops_qstat)) + goto fail_undo; - debugfs_create_file(qstat_names[qstat_reset_cnts], 0200, d_qstat, - (void *)(long)qstat_reset_cnts, &fops_qstat); return 0; +fail_undo: + debugfs_remove_recursive(d_qstat); +out: + pr_warn("Could not create 'qlockstat' debugfs entries\n"); + return -ENOMEM; } fs_initcall(init_qspinlock_stat); -- 2.8.1
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