On Sunday, January 20, 2013 06:37:59 PM Yinghai Lu wrote:
> On Sun, Jan 20, 2013 at 3:00 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> > On Thursday, January 17, 2013 11:53:19 PM Yinghai Lu wrote:
> >> From: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> >>
> >> acpi_install_notify_handler() could fail. So check the exit status
> >> and give a better debug info.
> >>
> >> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> >> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> >> ---
> >> drivers/acpi/pci_root.c | 12 +++++++++---
> >> 1 file changed, 9 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> >> index 3ce5d80..f3ceb61 100644
> >> --- a/drivers/acpi/pci_root.c
> >> +++ b/drivers/acpi/pci_root.c
> >> @@ -762,6 +762,7 @@ static void handle_hotplug_event_root(acpi_handle handle, u32 type,
> >> static acpi_status __init
> >> find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> >> {
> >> + acpi_status status;
> >> char objname[64];
> >> struct acpi_buffer buffer = { .length = sizeof(objname),
> >> .pointer = objname };
> >> @@ -774,9 +775,14 @@ find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
> >>
> >> acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
> >>
> >> - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> >> - handle_hotplug_event_root, NULL);
> >> - printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname);
> >> + status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
> >> + handle_hotplug_event_root, NULL);
> >> + if (ACPI_FAILURE(status))
> >> + printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n",
> >
> > Can you break that line, please? And use pr_debug()?
>
> Long line should be ok, and checkpatch.pl is not complaining about that.
>
> Also keep the complete print out in one line, could make git grep find
> that code exactly.
>
> Actually I really hate pr_debug(), that will make the generated code
> different with DEBUG
> defined or not. And need to end user to recompile kernel to get debug
> output if needed.
OK, whatever.
Thanks,
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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