kernel/umh.c: optimize 'proc_cap_handler()'
If 'write' is 0, we can avoid a call to spin_lock/spin_unlock. Link: http://lkml.kernel.org/r/20171020193331.7233-1-christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Acked-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 2 additions and 2 deletions
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@ -537,14 +537,14 @@ static int proc_cap_handler(struct ctl_table *table, int write,
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/*
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* Drop everything not in the new_cap (but don't add things)
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*/
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spin_lock(&umh_sysctl_lock);
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if (write) {
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spin_lock(&umh_sysctl_lock);
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if (table->data == CAP_BSET)
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usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap);
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if (table->data == CAP_PI)
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usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap);
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spin_unlock(&umh_sysctl_lock);
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}
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spin_unlock(&umh_sysctl_lock);
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return 0;
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}
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