diff options
Diffstat (limited to 'arch/s390/pci/pci_debug.c')
| -rw-r--r-- | arch/s390/pci/pci_debug.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/pci/pci_debug.c b/arch/s390/pci/pci_debug.c index 97db1a411d54..3fc9b4d90b59 100644 --- a/arch/s390/pci/pci_debug.c +++ b/arch/s390/pci/pci_debug.c @@ -58,8 +58,12 @@ static int pci_perf_show(struct seq_file *m, void *v) if (!zdev) return 0; - if (!zdev->fmb) + + mutex_lock(&zdev->lock); + if (!zdev->fmb) { + mutex_unlock(&zdev->lock); return seq_printf(m, "FMB statistics disabled\n"); + } /* header */ seq_printf(m, "FMB @ %p\n", zdev->fmb); @@ -78,6 +82,7 @@ static int pci_perf_show(struct seq_file *m, void *v) pci_perf_names[i], *(stat + i)); pci_sw_counter_show(m); + mutex_unlock(&zdev->lock); return 0; } @@ -95,19 +100,17 @@ static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf, if (rc) return rc; + mutex_lock(&zdev->lock); switch (val) { case 0: rc = zpci_fmb_disable_device(zdev); - if (rc) - return rc; break; case 1: rc = zpci_fmb_enable_device(zdev); - if (rc) - return rc; break; } - return count; + mutex_unlock(&zdev->lock); + return rc ? rc : count; } static int pci_perf_seq_open(struct inode *inode, struct file *filp) |