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s390/pci: add locking for fmb access

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Function measurement can be toggled at runtime. Make sure that
all access to the fmb is protected via a mutex.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2015-04-10 14:34:33 +02:00
committed by Martin Schwidefsky
parent 6001018ae8
commit 80ed156a3d
3 changed files with 12 additions and 6 deletions
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15
arch/s390/pci/pci_debug.c
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@@ -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)