The code block braced with CONFIG_ACPI_PROCFS is unblanced. When
CONFIG_ACPI_PROCFS=n, kernel trace will be produced like:
Call Trace:
[<c111637d>] ? remove_proc_entry+0x20d/0x290
[<c111637d>] ? remove_proc_entry+0x20d/0x290
[<c103b02c>] warn_slowpath_common+0x6c/0xc0
[<c111637d>] ? remove_proc_entry+0x20d/0x290
[<c103b0c6>] warn_slowpath_fmt+0x26/0x30
[<c111637d>] remove_proc_entry+0x20d/0x290
[<c1116bd7>] ? proc_register+0x117/0x1f0
[<c1116e83>] ? proc_mkdir_mode+0x33/0x50
[<c14f483c>] ? acpi_fan_init+0x0/0x2c
[<c14f485f>] acpi_fan_init+0x23/0x2c
[<c1001123>] do_one_initcall+0x23/0x180
[<c107dcf7>] ? init_irq_proc+0x67/0x80
[<c14d43bd>] kernel_init+0x13c/0x20e
[<c1030e50>] ? schedule_tail+0x20/0x90
[<c1389e06>] ? syscall_exit+0x5/0x16
[<c14d4281>] ? kernel_init+0x0/0x20e
[<c14d4281>] ? kernel_init+0x0/0x20e
[<c10032f6>] kernel_thread_helper+0x6/0x30
---[ end trace a7919e7f17c0a725 ]---
Then also bracket later error checking code with ACPI_PROCFS
option to avoid mismatch problem.
Signed-off-by: Liang Li <liang.li@xxxxxxxxxxxxx>
---
drivers/acpi/fan.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index acf2ab2..8a3b840 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -347,7 +347,6 @@ static int __init acpi_fan_init(void)
{
int result = 0;
-
#ifdef CONFIG_ACPI_PROCFS
acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
if (!acpi_fan_dir)
@@ -356,7 +355,9 @@ static int __init acpi_fan_init(void)
result = acpi_bus_register_driver(&acpi_fan_driver);
if (result < 0) {
+#ifdef CONFIG_ACPI_PROCFS
remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
+#endif
return -ENODEV;
}
--
1.6.6
--
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