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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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arch/s390/pci/pci.c
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@@ -827,6 +827,7 @@ int zpci_create_device(struct zpci_dev *zdev)
if (rc)
goto out;
mutex_init(&zdev->lock);
if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
rc = zpci_enable_device(zdev);
if (rc)