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Linux 6.5 compat: safe cleanup in spl_proc_fini()

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If we fail to create a proc entry in spl_proc_init() we may end up
calling unregister_sysctl_table() twice: one in the failure path of
spl_proc_init() and another time during spl_proc_fini().

Avoid the double call to unregister_sysctl_table() and while at it
refactor the code a bit to reduce code duplication.

This was accidentally introduced when the spl code was
updated for Linux 6.5 compatibility.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Closes #15234 
Closes #15235
This commit is contained in:
Andrea Righi 2023-09-02 02:21:40 +02:00 committed by Tony Hutter
parent c74a17a498
commit cb28c0b770
1 changed files with 18 additions and 18 deletions
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36
module/os/linux/spl/spl-proc.c
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@ -659,6 +659,21 @@ static struct ctl_table spl_root[] = {
};
#endif
static void spl_proc_cleanup(void)
{
remove_proc_entry("kstat", proc_spl);
remove_proc_entry("slab", proc_spl_kmem);
remove_proc_entry("kmem", proc_spl);
remove_proc_entry("taskq-all", proc_spl);
remove_proc_entry("taskq", proc_spl);
remove_proc_entry("spl", NULL);
if (spl_header) {
unregister_sysctl_table(spl_header);
spl_header = NULL;
}
}
int
spl_proc_init(void)
{
@ -723,15 +738,8 @@ spl_proc_init(void)
goto out;
}
out:
if (rc) {
remove_proc_entry("kstat", proc_spl);
remove_proc_entry("slab", proc_spl_kmem);
remove_proc_entry("kmem", proc_spl);
remove_proc_entry("taskq-all", proc_spl);
remove_proc_entry("taskq", proc_spl);
remove_proc_entry("spl", NULL);
unregister_sysctl_table(spl_header);
}
if (rc)
spl_proc_cleanup();
return (rc);
}
@ -739,13 +747,5 @@ out:
void
spl_proc_fini(void)
{
remove_proc_entry("kstat", proc_spl);
remove_proc_entry("slab", proc_spl_kmem);
remove_proc_entry("kmem", proc_spl);
remove_proc_entry("taskq-all", proc_spl);
remove_proc_entry("taskq", proc_spl);
remove_proc_entry("spl", NULL);
ASSERT(spl_header != NULL);
unregister_sysctl_table(spl_header);
spl_proc_cleanup();
}