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| author | Jeff Dike <jdike@addtoit.com> | 2007-02-10 01:43:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-11 10:51:21 -0800 |
| commit | 42d36115d25725fb551250c8f70602a12aa8dee2 (patch) | |
| tree | 8adf4535d3f79c4a590100407f229e21c05a2080 /arch/um | |
| parent | 4ea21cd9173a0ffa75dc74cc46d08dfc45654f29 (diff) | |
| download | linux-42d36115d25725fb551250c8f70602a12aa8dee2.tar.gz linux-42d36115d25725fb551250c8f70602a12aa8dee2.tar.bz2 linux-42d36115d25725fb551250c8f70602a12aa8dee2.zip | |
[PATCH] uml: watchdog driver locking
Replace BKL use with a spinlock.
Also fix the control so that open doesn't return holding a lock.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/drivers/harddog_kern.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c index 64ff22aa077b..94bbcb5b9227 100644 --- a/arch/um/drivers/harddog_kern.c +++ b/arch/um/drivers/harddog_kern.c @@ -44,12 +44,13 @@ #include <linux/reboot.h> #include <linux/smp_lock.h> #include <linux/init.h> +#include <linux/spinlock.h> #include <asm/uaccess.h> #include "mconsole.h" MODULE_LICENSE("GPL"); -/* Locked by the BKL in harddog_open and harddog_release */ +static DEFINE_SPINLOCK(lock); static int timer_alive; static int harddog_in_fd = -1; static int harddog_out_fd = -1; @@ -62,12 +63,12 @@ extern int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock); static int harddog_open(struct inode *inode, struct file *file) { - int err; + int err = -EBUSY; char *sock = NULL; - lock_kernel(); + spin_lock(&lock); if(timer_alive) - return -EBUSY; + goto err; #ifdef CONFIG_HARDDOG_NOWAYOUT __module_get(THIS_MODULE); #endif @@ -76,11 +77,15 @@ static int harddog_open(struct inode *inode, struct file *file) sock = mconsole_notify_socket(); #endif err = start_watchdog(&harddog_in_fd, &harddog_out_fd, sock); - if(err) return(err); + if(err) + goto err; timer_alive = 1; - unlock_kernel(); + spin_unlock(&lock); return nonseekable_open(inode, file); +err: + spin_unlock(&lock); + return err; } extern void stop_watchdog(int in_fd, int out_fd); @@ -90,14 +95,16 @@ static int harddog_release(struct inode *inode, struct file *file) /* * Shut off the timer. */ - lock_kernel(); + + spin_lock(&lock); stop_watchdog(harddog_in_fd, harddog_out_fd); harddog_in_fd = -1; harddog_out_fd = -1; timer_alive=0; - unlock_kernel(); + spin_unlock(&lock); + return 0; } |