From 86313c488a6848b7ec2ba04e74f25f79dd32a0b7 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 17 Jul 2007 18:37:03 -0700 Subject: [PATCH] usermodehelper: Tidy up waiting Rather than using a tri-state integer for the wait flag in call_usermodehelper_exec, define a proper enum, and use that. I've preserved the integer values so that any callers I've missed should still work OK. Signed-off-by: Jeremy Fitzhardinge Cc: James Bottomley Cc: Randy Dunlap Cc: Christoph Hellwig Cc: Andi Kleen Cc: Paul Mackerras Cc: Johannes Berg Cc: Ralf Baechle Cc: Bjorn Helgaas Cc: Joel Becker Cc: Tony Luck Cc: Kay Sievers Cc: Srivatsa Vaddagiri Cc: Oleg Nesterov Cc: David Howells --- arch/i386/mach-voyager/voyager_thread.c | 2 +- arch/x86_64/kernel/mce.c | 2 +- drivers/macintosh/therm_pm72.c | 3 ++- drivers/macintosh/windfarm_core.c | 3 ++- drivers/net/hamradio/baycom_epp.c | 2 +- drivers/pnp/pnpbios/core.c | 2 +- fs/ocfs2/heartbeat.c | 2 +- include/linux/kmod.h | 12 ++++++++--- kernel/cpuset.c | 2 +- kernel/kmod.c | 27 +++++++++++++++---------- kernel/sys.c | 2 +- lib/kobject_uevent.c | 2 +- net/bridge/br_stp_if.c | 2 +- security/keys/request_key.c | 3 ++- 14 files changed, 40 insertions(+), 26 deletions(-) diff --git a/arch/i386/mach-voyager/voyager_thread.c b/arch/i386/mach-voyager/voyager_thread.c index b4b24e0e45e1..f9d595338159 100644 --- a/arch/i386/mach-voyager/voyager_thread.c +++ b/arch/i386/mach-voyager/voyager_thread.c @@ -52,7 +52,7 @@ execute(const char *string) NULL, }; - if ((ret = call_usermodehelper(argv[0], argv, envp, 1)) != 0) { + if ((ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC)) != 0) { printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", string, ret); } diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c index aa1d15991794..f3fb8174559e 100644 --- a/arch/x86_64/kernel/mce.c +++ b/arch/x86_64/kernel/mce.c @@ -174,7 +174,7 @@ static void do_mce_trigger(void) if (events != atomic_read(&mce_logged) && trigger[0]) { /* Small race window, but should be harmless. */ atomic_set(&mce_logged, events); - call_usermodehelper(trigger, trigger_argv, NULL, -1); + call_usermodehelper(trigger, trigger_argv, NULL, UMH_NO_WAIT); } } diff --git a/drivers/macintosh/therm_pm72.c b/drivers/macintosh/therm_pm72.c index dbb22403979f..3d90fc002097 100644 --- a/drivers/macintosh/therm_pm72.c +++ b/drivers/macintosh/therm_pm72.c @@ -1770,7 +1770,8 @@ static int call_critical_overtemp(void) "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; - return call_usermodehelper(critical_overtemp_path, argv, envp, 0); + return call_usermodehelper(critical_overtemp_path, + argv, envp, UMH_WAIT_EXEC); } diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c index e18d265d5d33..516d943227e2 100644 --- a/drivers/macintosh/windfarm_core.c +++ b/drivers/macintosh/windfarm_core.c @@ -80,7 +80,8 @@ int wf_critical_overtemp(void) "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; - return call_usermodehelper(critical_overtemp_path, argv, envp, 0); + return call_usermodehelper(critical_overtemp_path, + argv, envp, UMH_WAIT_EXEC); } EXPORT_SYMBOL_GPL(wf_critical_overtemp); diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c index 84aa2117c0ee..355c6cf3d112 100644 --- a/drivers/net/hamradio/baycom_epp.c +++ b/drivers/net/hamradio/baycom_epp.c @@ -320,7 +320,7 @@ static int eppconfig(struct baycom_state *bc) sprintf(portarg, "%ld", bc->pdev->port->base); printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg); - return call_usermodehelper(eppconfig_path, argv, envp, 1); + return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC); } /* ---------------------------------------------------------------------- */ diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c index 03baf1c64a2e..ed112ee16012 100644 --- a/drivers/pnp/pnpbios/core.c +++ b/drivers/pnp/pnpbios/core.c @@ -147,7 +147,7 @@ static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) info->location_id, info->serial, info->capabilities); envp[i] = NULL; - value = call_usermodehelper (argv [0], argv, envp, 0); + value = call_usermodehelper (argv [0], argv, envp, UMH_WAIT_EXEC); kfree (buf); kfree (envp); return 0; diff --git a/fs/ocfs2/heartbeat.c b/fs/ocfs2/heartbeat.c index 352eb4a13f98..c4c36171240d 100644 --- a/fs/ocfs2/heartbeat.c +++ b/fs/ocfs2/heartbeat.c @@ -209,7 +209,7 @@ void ocfs2_stop_heartbeat(struct ocfs2_super *osb) envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; envp[2] = NULL; - ret = call_usermodehelper(argv[0], argv, envp, 1); + ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); if (ret < 0) mlog_errno(ret); } diff --git a/include/linux/kmod.h b/include/linux/kmod.h index c4cbe59d9c67..5dc13848891b 100644 --- a/include/linux/kmod.h +++ b/include/linux/kmod.h @@ -51,15 +51,21 @@ int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info, void call_usermodehelper_setcleanup(struct subprocess_info *info, void (*cleanup)(char **argv, char **envp)); +enum umh_wait { + UMH_NO_WAIT = -1, /* don't wait at all */ + UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ + UMH_WAIT_PROC = 1, /* wait for the process to complete */ +}; + /* Actually execute the sub-process */ -int call_usermodehelper_exec(struct subprocess_info *info, int wait); +int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait); /* Free the subprocess_info. This is only needed if you're not going to call call_usermodehelper_exec */ void call_usermodehelper_freeinfo(struct subprocess_info *info); static inline int -call_usermodehelper(char *path, char **argv, char **envp, int wait) +call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) { struct subprocess_info *info; @@ -71,7 +77,7 @@ call_usermodehelper(char *path, char **argv, char **envp, int wait) static inline int call_usermodehelper_keys(char *path, char **argv, char **envp, - struct key *session_keyring, int wait) + struct key *session_keyring, enum umh_wait wait) { struct subprocess_info *info; diff --git a/kernel/cpuset.c b/kernel/cpuset.c index b4796d850140..57e6448b171e 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -516,7 +516,7 @@ static void cpuset_release_agent(const char *pathbuf) envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; envp[i] = NULL; - call_usermodehelper(argv[0], argv, envp, 0); + call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); kfree(pathbuf); } diff --git a/kernel/kmod.c b/kernel/kmod.c index d2dce71115d8..78d365c524ed 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -119,7 +119,7 @@ struct subprocess_info { char **argv; char **envp; struct key *ring; - int wait; + enum umh_wait wait; int retval; struct file *stdin; void (*cleanup)(char **argv, char **envp); @@ -225,7 +225,7 @@ static int wait_for_helper(void *data) sub_info->retval = ret; } - if (sub_info->wait < 0) + if (sub_info->wait == UMH_NO_WAIT) call_usermodehelper_freeinfo(sub_info); else complete(sub_info->complete); @@ -238,26 +238,31 @@ static void __call_usermodehelper(struct work_struct *work) struct subprocess_info *sub_info = container_of(work, struct subprocess_info, work); pid_t pid; - int wait = sub_info->wait; + enum umh_wait wait = sub_info->wait; /* CLONE_VFORK: wait until the usermode helper has execve'd * successfully We need the data structures to stay around * until that is done. */ - if (wait) + if (wait == UMH_WAIT_PROC || wait == UMH_NO_WAIT) pid = kernel_thread(wait_for_helper, sub_info, CLONE_FS | CLONE_FILES | SIGCHLD); else pid = kernel_thread(____call_usermodehelper, sub_info, CLONE_VFORK | SIGCHLD); - if (wait < 0) - return; + switch (wait) { + case UMH_NO_WAIT: + break; - if (pid < 0) { + case UMH_WAIT_PROC: + if (pid > 0) + break; sub_info->retval = pid; + /* FALLTHROUGH */ + + case UMH_WAIT_EXEC: complete(sub_info->complete); - } else if (!wait) - complete(sub_info->complete); + } } /** @@ -359,7 +364,7 @@ EXPORT_SYMBOL(call_usermodehelper_stdinpipe); * (ie. it runs with full root capabilities). */ int call_usermodehelper_exec(struct subprocess_info *sub_info, - int wait) + enum umh_wait wait) { DECLARE_COMPLETION_ONSTACK(done); int retval; @@ -378,7 +383,7 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, sub_info->wait = wait; queue_work(khelper_wq, &sub_info->work); - if (wait < 0) /* task has freed sub_info */ + if (wait == UMH_NO_WAIT) /* task has freed sub_info */ return 0; wait_for_completion(&done); retval = sub_info->retval; diff --git a/kernel/sys.c b/kernel/sys.c index aeded9ad66ce..18987c7f6add 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2327,7 +2327,7 @@ int orderly_poweroff(bool force) call_usermodehelper_setcleanup(info, argv_cleanup); - ret = call_usermodehelper_exec(info, -1); + ret = call_usermodehelper_exec(info, UMH_NO_WAIT); out: if (ret && force) { diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index 12e311dc664c..bd5ecbbafab1 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -208,7 +208,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, argv [0] = uevent_helper; argv [1] = (char *)subsystem; argv [2] = NULL; - call_usermodehelper (argv[0], argv, envp, 0); + call_usermodehelper (argv[0], argv, envp, UMH_WAIT_EXEC); } exit: diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c index a786e7863200..1ea2f86f7683 100644 --- a/net/bridge/br_stp_if.c +++ b/net/bridge/br_stp_if.c @@ -125,7 +125,7 @@ static void br_stp_start(struct net_bridge *br) char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL }; char *envp[] = { NULL }; - r = call_usermodehelper(BR_STP_PROG, argv, envp, 1); + r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC); if (r == 0) { br->stp_enabled = BR_USER_STP; printk(KERN_INFO "%s: userspace STP started\n", br->dev->name); diff --git a/security/keys/request_key.c b/security/keys/request_key.c index f573ac189a0a..557500110a13 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -108,7 +108,8 @@ static int call_sbin_request_key(struct key *key, argv[i] = NULL; /* do it */ - ret = call_usermodehelper_keys(argv[0], argv, envp, keyring, 1); + ret = call_usermodehelper_keys(argv[0], argv, envp, keyring, + UMH_WAIT_PROC); error_link: key_put(keyring);