s390/pci: rename lock member in struct zpci_dev

Since this guards only the Function Measurement Block, rename from
generic lock to fmb_lock in preparation to introduce another lock
that guards the state member

Signed-off-by: Gerd Bayer <gbayer@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/pci.h

@@ -142,7 +142,6 @@ struct zpci_dev {
 	u8		reserved	: 2;
 	unsigned int	devfn;		/* DEVFN part of the RID*/
 
-	struct mutex lock;
 	u8 pfip[CLP_PFIP_NR_SEGMENTS];	/* pci function internal path */
 	u32 uid;			/* user defined id */
 	u8 util_str[CLP_UTIL_STR_LEN];	/* utility string */
@@ -170,6 +169,7 @@ struct zpci_dev {
 	u64		dma_mask;	/* DMA address space mask */
 
 	/* Function measurement block */
+	struct mutex fmb_lock;
 	struct zpci_fmb *fmb;
 	u16		fmb_update;	/* update interval */
 	u16		fmb_length;

arch/s390/pci/pci.c

@@ -806,7 +806,7 @@ struct zpci_dev *zpci_create_device(u32 fid, u32 fh, enum zpci_state state)
 	zdev->state =  state;
 
 	kref_init(&zdev->kref);
-	mutex_init(&zdev->lock);
+	mutex_init(&zdev->fmb_lock);
 	mutex_init(&zdev->kzdev_lock);
 
 	rc = zpci_init_iommu(zdev);

arch/s390/pci/pci_debug.c

@@ -91,9 +91,9 @@ static int pci_perf_show(struct seq_file *m, void *v)
 	if (!zdev)
 		return 0;
 
-	mutex_lock(&zdev->lock);
+	mutex_lock(&zdev->fmb_lock);
 	if (!zdev->fmb) {
-		mutex_unlock(&zdev->lock);
+		mutex_unlock(&zdev->fmb_lock);
 		seq_puts(m, "FMB statistics disabled\n");
 		return 0;
 	}
@@ -130,7 +130,7 @@ static int pci_perf_show(struct seq_file *m, void *v)
 	}
 
 	pci_sw_counter_show(m);
-	mutex_unlock(&zdev->lock);
+	mutex_unlock(&zdev->fmb_lock);
 	return 0;
 }
 
@@ -148,7 +148,7 @@ static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 	if (rc)
 		return rc;
 
-	mutex_lock(&zdev->lock);
+	mutex_lock(&zdev->fmb_lock);
 	switch (val) {
 	case 0:
 		rc = zpci_fmb_disable_device(zdev);
@@ -157,7 +157,7 @@ static ssize_t pci_perf_seq_write(struct file *file, const char __user *ubuf,
 		rc = zpci_fmb_enable_device(zdev);
 		break;
 	}
-	mutex_unlock(&zdev->lock);
+	mutex_unlock(&zdev->fmb_lock);
 	return rc ? rc : count;
 }