diff options
Diffstat (limited to 'kernel/printk/printk.c')
| -rw-r--r-- | kernel/printk/printk.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 4dae9cbe9259..a45b50962295 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -319,7 +319,7 @@ static void log_store(int facility, int level, else free = log_first_idx - log_next_idx; - if (free > size + sizeof(struct printk_log)) + if (free >= size + sizeof(struct printk_log)) break; /* drop old messages until we have enough contiuous space */ @@ -327,7 +327,7 @@ static void log_store(int facility, int level, log_first_seq++; } - if (log_next_idx + size + sizeof(struct printk_log) >= log_buf_len) { + if (log_next_idx + size + sizeof(struct printk_log) > log_buf_len) { /* * This message + an additional empty header does not fit * at the end of the buffer. Add an empty header with len == 0 @@ -351,7 +351,7 @@ static void log_store(int facility, int level, else msg->ts_nsec = local_clock(); memset(log_dict(msg) + dict_len, 0, pad_len); - msg->len = sizeof(struct printk_log) + text_len + dict_len + pad_len; + msg->len = size; /* insert message */ log_next_idx += msg->len; @@ -1560,9 +1560,12 @@ asmlinkage int vprintk_emit(int facility, int level, level = kern_level - '0'; case 'd': /* KERN_DEFAULT */ lflags |= LOG_PREFIX; - case 'c': /* KERN_CONT */ - break; } + /* + * No need to check length here because vscnprintf + * put '\0' at the end of the string. Only valid and + * newly printed level is detected. + */ text_len -= end_of_header - text; text = (char *)end_of_header; } @@ -1880,6 +1883,7 @@ void suspend_console(void) console_lock(); console_suspended = 1; up(&console_sem); + mutex_release(&console_lock_dep_map, 1, _RET_IP_); } void resume_console(void) @@ -1887,6 +1891,7 @@ void resume_console(void) if (!console_suspend_enabled) return; down(&console_sem); + mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_); console_suspended = 0; console_unlock(); } |