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Message-Id: <c44a2c86b81f8e0a5cb981394b5de856035e8526.1451367389.git.lv.zheng@intel.com> Date: Tue, 29 Dec 2015 13:56:14 +0800 From: Lv Zheng <lv.zheng@...el.com> To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Len Brown <len.brown@...el.com> Cc: Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>, <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org, Bob Moore <robert.moore@...el.com> Subject: [PATCH 15/42] ACPICA: Add comment explaining _SUB removal From: Bob Moore <robert.moore@...el.com> ACPICA commit 81a89968f83bfc3b1d0f0f80f2da08ea69646053 Adds a lengthy comment to acpi_get_object_info explaining the removal of _SUB and why no complex methods can be added ever to this interface. Link: https://github.com/acpica/acpica/commit/81a89968 Signed-off-by: Bob Moore <robert.moore@...el.com> Signed-off-by: Lv Zheng <lv.zheng@...el.com> --- drivers/acpi/acpica/nsxfname.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/acpi/acpica/nsxfname.c b/drivers/acpi/acpica/nsxfname.c index 0e4e6b7..669e0f1 100644 --- a/drivers/acpi/acpica/nsxfname.c +++ b/drivers/acpi/acpica/nsxfname.c @@ -267,6 +267,13 @@ static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest, * * Note: Allocates the return buffer, must be freed by the caller. * + * Note: This interface is intended to be used during the initial device + * discovery namespace traversal. Therefore, no complex methods can be + * executed, especially those that access operation regions. Therefore, do + * not add any additional methods that could cause problems in this area. + * this was the fate of the _SUB method which was found to cause such + * problems and was removed (11/2015). + * ******************************************************************************/ acpi_status -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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