From 9b78c1da60b3c62ccdd1509f0902ad19ceaf776b Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 28 Mar 2012 23:30:02 +0200 Subject: [PATCH] firmware_class: Do not warn that system is not ready from async loads If firmware is requested asynchronously, by calling request_firmware_nowait(), there is no reason to fail the request (and warn the user) when the system is (presumably temporarily) unready to handle it (because user space is not available yet or frozen). For this reason, introduce an alternative routine for read-locking umhelper_sem, usermodehelper_read_lock_wait(), that will wait for usermodehelper_disabled to be unset (possibly with a timeout) and make request_firmware_work_func() use it instead of usermodehelper_read_trylock(). Accordingly, modify request_firmware() so that it uses usermodehelper_read_trylock() to acquire umhelper_sem and remove the code related to that lock from _request_firmware(). Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman Cc: stable@vger.kernel.org --- drivers/base/firmware_class.c | 51 +++++++++++++++++------------- include/linux/kmod.h | 1 + kernel/kmod.c | 58 +++++++++++++++++++++++++++-------- 3 files changed, 76 insertions(+), 34 deletions(-) diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 60290671f04a..72c644b191a4 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -81,6 +81,11 @@ enum { static int loading_timeout = 60; /* In seconds */ +static inline long firmware_loading_timeout(void) +{ + return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT; +} + /* fw_lock could be moved to 'struct firmware_priv' but since it is just * guarding for corner cases a global lock should be OK */ static DEFINE_MUTEX(fw_lock); @@ -541,31 +546,22 @@ static void _request_firmware_cleanup(const struct firmware **firmware_p) static int _request_firmware(const struct firmware *firmware, const char *name, struct device *device, - bool uevent, bool nowait) + bool uevent, bool nowait, long timeout) { struct firmware_priv *fw_priv; - int retval; - - retval = usermodehelper_read_trylock(); - if (WARN_ON(retval)) { - dev_err(device, "firmware: %s will not be loaded\n", name); - return retval; - } + int retval = 0; if (uevent) dev_dbg(device, "firmware: requesting %s\n", name); fw_priv = fw_create_instance(firmware, name, device, uevent, nowait); - if (IS_ERR(fw_priv)) { - retval = PTR_ERR(fw_priv); - goto out; - } + if (IS_ERR(fw_priv)) + return PTR_ERR(fw_priv); if (uevent) { - if (loading_timeout > 0) + if (timeout != MAX_SCHEDULE_TIMEOUT) mod_timer(&fw_priv->timeout, - round_jiffies_up(jiffies + - loading_timeout * HZ)); + round_jiffies_up(jiffies + timeout)); kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD); } @@ -582,9 +578,6 @@ static int _request_firmware(const struct firmware *firmware, mutex_unlock(&fw_lock); fw_destroy_instance(fw_priv); - -out: - usermodehelper_read_unlock(); return retval; } @@ -613,7 +606,14 @@ request_firmware(const struct firmware **firmware_p, const char *name, if (ret <= 0) return ret; - ret = _request_firmware(*firmware_p, name, device, true, false); + ret = usermodehelper_read_trylock(); + if (WARN_ON(ret)) { + dev_err(device, "firmware: %s will not be loaded\n", name); + } else { + ret = _request_firmware(*firmware_p, name, device, true, false, + firmware_loading_timeout()); + usermodehelper_read_unlock(); + } if (ret) _request_firmware_cleanup(firmware_p); @@ -648,6 +648,7 @@ static int request_firmware_work_func(void *arg) { struct firmware_work *fw_work = arg; const struct firmware *fw; + long timeout; int ret; if (!arg) { @@ -659,8 +660,16 @@ static int request_firmware_work_func(void *arg) if (ret <= 0) goto out; - ret = _request_firmware(fw, fw_work->name, fw_work->device, - fw_work->uevent, true); + timeout = usermodehelper_read_lock_wait(firmware_loading_timeout()); + if (timeout) { + ret = _request_firmware(fw, fw_work->name, fw_work->device, + fw_work->uevent, true, timeout); + usermodehelper_read_unlock(); + } else { + dev_dbg(fw_work->device, "firmware: %s loading timed out\n", + fw_work->name); + ret = -EAGAIN; + } if (ret) _request_firmware_cleanup(&fw); diff --git a/include/linux/kmod.h b/include/linux/kmod.h index 97d22c3e08b1..b087377ae2c4 100644 --- a/include/linux/kmod.h +++ b/include/linux/kmod.h @@ -115,6 +115,7 @@ extern void usermodehelper_init(void); extern int usermodehelper_disable(void); extern void usermodehelper_enable(void); extern int usermodehelper_read_trylock(void); +extern long usermodehelper_read_lock_wait(long timeout); extern void usermodehelper_read_unlock(void); #endif /* __LINUX_KMOD_H__ */ diff --git a/kernel/kmod.c b/kernel/kmod.c index 4079ac1d5e79..da7fcca279f9 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -333,6 +333,12 @@ static atomic_t running_helpers = ATOMIC_INIT(0); */ static DECLARE_WAIT_QUEUE_HEAD(running_helpers_waitq); +/* + * Used by usermodehelper_read_lock_wait() to wait for usermodehelper_disabled + * to become 'false'. + */ +static DECLARE_WAIT_QUEUE_HEAD(usermodehelper_disabled_waitq); + /* * Time to wait for running_helpers to become zero before the setting of * usermodehelper_disabled in usermodehelper_disable() fails @@ -352,12 +358,50 @@ int usermodehelper_read_trylock(void) } EXPORT_SYMBOL_GPL(usermodehelper_read_trylock); +long usermodehelper_read_lock_wait(long timeout) +{ + DEFINE_WAIT(wait); + + if (timeout < 0) + return -EINVAL; + + down_read(&umhelper_sem); + for (;;) { + prepare_to_wait(&usermodehelper_disabled_waitq, &wait, + TASK_UNINTERRUPTIBLE); + if (!usermodehelper_disabled) + break; + + up_read(&umhelper_sem); + + timeout = schedule_timeout(timeout); + if (!timeout) + break; + + down_read(&umhelper_sem); + } + finish_wait(&usermodehelper_disabled_waitq, &wait); + return timeout; +} +EXPORT_SYMBOL_GPL(usermodehelper_read_lock_wait); + void usermodehelper_read_unlock(void) { up_read(&umhelper_sem); } EXPORT_SYMBOL_GPL(usermodehelper_read_unlock); +/** + * usermodehelper_enable - allow new helpers to be started again + */ +void usermodehelper_enable(void) +{ + down_write(&umhelper_sem); + usermodehelper_disabled = 0; + wake_up(&usermodehelper_disabled_waitq); + up_write(&umhelper_sem); +} + /** * usermodehelper_disable - prevent new helpers from being started */ @@ -381,22 +425,10 @@ int usermodehelper_disable(void) if (retval) return 0; - down_write(&umhelper_sem); - usermodehelper_disabled = 0; - up_write(&umhelper_sem); + usermodehelper_enable(); return -EAGAIN; } -/** - * usermodehelper_enable - allow new helpers to be started again - */ -void usermodehelper_enable(void) -{ - down_write(&umhelper_sem); - usermodehelper_disabled = 0; - up_write(&umhelper_sem); -} - static void helper_lock(void) { atomic_inc(&running_helpers); -- 2.39.5