diff options
Diffstat (limited to 'drivers/s390/block/dasd_proc.c')
| -rw-r--r-- | drivers/s390/block/dasd_proc.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c index 78ac905a5b7f..aa7bb2d1da81 100644 --- a/drivers/s390/block/dasd_proc.c +++ b/drivers/s390/block/dasd_proc.c @@ -212,14 +212,15 @@ static int dasd_stats_proc_show(struct seq_file *m, void *v) struct dasd_profile_info *prof; int factor; - /* check for active profiling */ - if (!dasd_global_profile_level) { + spin_lock_bh(&dasd_global_profile.lock); + prof = dasd_global_profile.data; + if (!prof) { + spin_unlock_bh(&dasd_global_profile.lock); seq_printf(m, "Statistics are off - they might be " "switched on using 'echo set on > " "/proc/dasd/statistics'\n"); return 0; } - prof = &dasd_global_profile_data; /* prevent counter 'overflow' on output */ for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; @@ -255,6 +256,7 @@ static int dasd_stats_proc_show(struct seq_file *m, void *v) dasd_statistics_array(m, prof->dasd_io_time3, factor); seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); dasd_statistics_array(m, prof->dasd_io_nr_req, factor); + spin_unlock_bh(&dasd_global_profile.lock); #else seq_printf(m, "Statistics are not activated in this kernel\n"); #endif @@ -291,14 +293,19 @@ static ssize_t dasd_stats_proc_write(struct file *file, dasd_stats_all_block_off(); goto out_error; } - dasd_global_profile_reset(); + rc = dasd_profile_on(&dasd_global_profile); + if (rc) { + dasd_stats_all_block_off(); + goto out_error; + } + dasd_profile_reset(&dasd_global_profile); dasd_global_profile_level = DASD_PROFILE_ON; pr_info("The statistics feature has been switched " "on\n"); } else if (strcmp(str, "off") == 0) { - /* switch off and reset statistics profiling */ + /* switch off statistics profiling */ dasd_global_profile_level = DASD_PROFILE_OFF; - dasd_global_profile_reset(); + dasd_profile_off(&dasd_global_profile); dasd_stats_all_block_off(); pr_info("The statistics feature has been switched " "off\n"); @@ -306,7 +313,7 @@ static ssize_t dasd_stats_proc_write(struct file *file, goto out_parse_error; } else if (strncmp(str, "reset", 5) == 0) { /* reset the statistics */ - dasd_global_profile_reset(); + dasd_profile_reset(&dasd_global_profile); dasd_stats_all_block_reset(); pr_info("The statistics have been reset\n"); } else |