From 73a94d86a8625371f76de0ee12dc5bacd3ed42c0 Mon Sep 17 00:00:00 2001 From: Henrique de Moraes Holschuh Date: Sat, 4 Apr 2009 04:25:47 +0000 Subject: [PATCH] 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 Signed-off-by: Len Brown --- Documentation/laptops/thinkpad-acpi.txt | 2 ++ drivers/platform/x86/thinkpad_acpi.c | 40 +++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt index f6e6bc66eed..e8f52fbadfe 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 6331b88d77d..852be7c1a17 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -54,6 +54,7 @@ #include #include #include +#include #include #include #include @@ -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; -- 2.41.1