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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2009-04-04 04:25:47 +0000
committerLen Brown <len.brown@intel.com>2009-04-04 03:14:52 -0400
commit73a94d86a8625371f76de0ee12dc5bacd3ed42c0 (patch)
treedb8def5a298edf3b70efefb4fd255da87ca0d2fd
parent7ff8d62f7f055aaffbeb493863136c1b876bbe2e (diff)
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thinkpad-acpi: add new debug helpers and warn of deprecated atts
Add a debug helper that discloses the TGID of the userspace task attempting to access the driver. This is highly useful when dealing with bug reports, since often the user has no idea that some userspace application is accessing thinkpad-acpi... Also add a helper to log warnings about sysfs attributes that are deprecated. Use the new helpers to issue deprecation warnings for bluetooth_enable and wwan_enabled, that have been deprecated for a while, now. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt2
-rw-r--r--drivers/platform/x86/thinkpad_acpi.c40
2 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index f6e6bc6..e8f52fb 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1484,6 +1484,8 @@ will enable all debugging output classes. It takes a bitmask, so
to enable more than one output class, just add their values.
Debug bitmask Description
+ 0x8000 Disclose PID of userspace programs
+ accessing some functions of the driver
0x0001 Initialization and probing
0x0002 Removal
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 6331b88..852be7c 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -54,6 +54,7 @@
#include <linux/string.h>
#include <linux/list.h>
#include <linux/mutex.h>
+#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/delay.h>
@@ -185,6 +186,7 @@ enum {
/* Debugging printk groups */
#define TPACPI_DBG_ALL 0xffff
+#define TPACPI_DBG_DISCLOSETASK 0x8000
#define TPACPI_DBG_INIT 0x0001
#define TPACPI_DBG_EXIT 0x0002
@@ -335,6 +337,21 @@ static const char *str_supported(int is_supported);
do { } while (0)
#endif
+static void tpacpi_log_usertask(const char * const what)
+{
+ printk(TPACPI_DEBUG "%s: access by process with PID %d\n",
+ what, task_tgid_vnr(current));
+}
+
+#define tpacpi_disclose_usertask(what, format, arg...) \
+ do { \
+ if (unlikely( \
+ (dbg_level & TPACPI_DBG_DISCLOSETASK) && \
+ (tpacpi_lifecycle == TPACPI_LIFE_RUNNING))) { \
+ printk(TPACPI_DEBUG "%s: PID %d: " format, \
+ what, task_tgid_vnr(current), ## arg); \
+ } \
+ } while (0)
/****************************************************************************
****************************************************************************
@@ -1030,6 +1047,21 @@ static int __init tpacpi_new_rfkill(const unsigned int id,
return 0;
}
+static void printk_deprecated_attribute(const char * const what,
+ const char * const details)
+{
+ tpacpi_log_usertask("deprecated sysfs attribute");
+ printk(TPACPI_WARN "WARNING: sysfs attribute %s is deprecated and "
+ "will be removed. %s\n",
+ what, details);
+}
+
+static void printk_deprecated_rfkill_attribute(const char * const what)
+{
+ printk_deprecated_attribute(what,
+ "Please switch to generic rfkill before year 2010");
+}
+
/*************************************************************************
* thinkpad-acpi driver attributes
*/
@@ -3070,6 +3102,8 @@ static ssize_t bluetooth_enable_show(struct device *dev,
{
int status;
+ printk_deprecated_rfkill_attribute("bluetooth_enable");
+
status = bluetooth_get_radiosw();
if (status < 0)
return status;
@@ -3085,6 +3119,8 @@ static ssize_t bluetooth_enable_store(struct device *dev,
unsigned long t;
int res;
+ printk_deprecated_rfkill_attribute("bluetooth_enable");
+
if (parse_strtoul(buf, 1, &t))
return -EINVAL;
@@ -3347,6 +3383,8 @@ static ssize_t wan_enable_show(struct device *dev,
{
int status;
+ printk_deprecated_rfkill_attribute("wwan_enable");
+
status = wan_get_radiosw();
if (status < 0)
return status;
@@ -3362,6 +3400,8 @@ static ssize_t wan_enable_store(struct device *dev,
unsigned long t;
int res;
+ printk_deprecated_rfkill_attribute("wwan_enable");
+
if (parse_strtoul(buf, 1, &t))
return -EINVAL;