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-rw-r--r--drivers/acpi/utils.c64
1 files changed, 52 insertions, 12 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index bba526148583..07c8c5a5ee95 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -30,6 +30,7 @@
#include <linux/types.h>
#include <linux/hardirq.h>
#include <linux/acpi.h>
+#include <linux/dynamic_debug.h>
#include "internal.h"
@@ -457,6 +458,24 @@ acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
EXPORT_SYMBOL(acpi_evaluate_ost);
/**
+ * acpi_handle_path: Return the object path of handle
+ *
+ * Caller must free the returned buffer
+ */
+static char *acpi_handle_path(acpi_handle handle)
+{
+ struct acpi_buffer buffer = {
+ .length = ACPI_ALLOCATE_BUFFER,
+ .pointer = NULL
+ };
+
+ if (in_interrupt() ||
+ acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK)
+ return NULL;
+ return buffer.pointer;
+}
+
+/**
* acpi_handle_printk: Print message with ACPI prefix and object path
*
* This function is called through acpi_handle_<level> macros and prints
@@ -469,29 +488,50 @@ acpi_handle_printk(const char *level, acpi_handle handle, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
- struct acpi_buffer buffer = {
- .length = ACPI_ALLOCATE_BUFFER,
- .pointer = NULL
- };
const char *path;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
- if (in_interrupt() ||
- acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer) != AE_OK)
- path = "<n/a>";
- else
- path = buffer.pointer;
-
- printk("%sACPI: %s: %pV", level, path, &vaf);
+ path = acpi_handle_path(handle);
+ printk("%sACPI: %s: %pV", level, path ? path : "<n/a>" , &vaf);
va_end(args);
- kfree(buffer.pointer);
+ kfree(path);
}
EXPORT_SYMBOL(acpi_handle_printk);
+#if defined(CONFIG_DYNAMIC_DEBUG)
+/**
+ * __acpi_handle_debug: pr_debug with ACPI prefix and object path
+ *
+ * This function is called through acpi_handle_debug macro and debug
+ * prints a message with ACPI prefix and object path. This function
+ * acquires the global namespace mutex to obtain an object path. In
+ * interrupt context, it shows the object path as <n/a>.
+ */
+void
+__acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+ const char *path;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ path = acpi_handle_path(handle);
+ __dynamic_pr_debug(descriptor, "ACPI: %s: %pV", path ? path : "<n/a>", &vaf);
+
+ va_end(args);
+ kfree(path);
+}
+EXPORT_SYMBOL(__acpi_handle_debug);
+#endif
+
/**
* acpi_has_method: Check whether @handle has a method named @name
* @handle: ACPI device handle