1 files changed, 33 insertions, 22 deletions

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 39bb96b413ef..98ddba94b5b9 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -133,39 +133,46 @@ PCI_USER_WRITE_CONFIG(dword, u32)
 
 struct pci_vpd_pci22 {
 	struct pci_vpd base;
-	spinlock_t lock; /* controls access to hardware and the flags */
-	u8	cap;
+	struct mutex lock;
+	u16	flag;
 	bool	busy;
-	bool	flag; /* value of F bit to wait for */
+	u8	cap;
 };
 
-/* Wait for last operation to complete */
+/*
+ * Wait for last operation to complete.
+ * This code has to spin since there is no other notification from the PCI
+ * hardware. Since the VPD is often implemented by serial attachment to an
+ * EEPROM, it may take many milliseconds to complete.
+ */
 static int pci_vpd_pci22_wait(struct pci_dev *dev)
 {
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
-	u16 flag, status;
-	int wait;
+	unsigned long timeout = jiffies + HZ/20 + 2;
+	u16 status;
 	int ret;
 
 	if (!vpd->busy)
 		return 0;
 
-	flag = vpd->flag ? PCI_VPD_ADDR_F : 0;
-	wait = vpd->flag ? 10 : 1000; /* read: 100 us; write: 10 ms */
 	for (;;) {
-		ret = pci_user_read_config_word(dev,
-						vpd->cap + PCI_VPD_ADDR,
+		ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
 						&status);
-		if (ret < 0)
+		if (ret)
 			return ret;
-		if ((status & PCI_VPD_ADDR_F) == flag) {
+
+		if ((status & PCI_VPD_ADDR_F) == vpd->flag) {
 			vpd->busy = false;
 			return 0;
 		}
-		if (wait-- == 0)
+
+		if (time_after(jiffies, timeout))
 			return -ETIMEDOUT;
-		udelay(10);
+		if (fatal_signal_pending(current))
+			return -EINTR;
+		if (!cond_resched())
+			udelay(10);
 	}
 }
 
@@ -175,7 +182,7 @@ static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
 	u32 val;
-	int ret;
+	int ret = 0;
 	int begin, end, i;
 
 	if (pos < 0 || pos > vpd->base.len || size > vpd->base.len  - pos)
@@ -183,7 +190,9 @@ static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
 	if (size == 0)
 		return 0;
 
-	spin_lock_irq(&vpd->lock);
+	if (mutex_lock_killable(&vpd->lock))
+		return -EINTR;
+
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
@@ -191,15 +200,16 @@ static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
 					 pos & ~3);
 	if (ret < 0)
 		goto out;
+
 	vpd->busy = true;
-	vpd->flag = 1;
+	vpd->flag = PCI_VPD_ADDR_F;
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
 	ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
 					 &val);
 out:
-	spin_unlock_irq(&vpd->lock);
+	mutex_unlock(&vpd->lock);
 	if (ret < 0)
 		return ret;
 
@@ -220,7 +230,7 @@ static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
 	u32 val;
-	int ret;
+	int ret = 0;
 
 	if (pos < 0 || pos > vpd->base.len || pos & 3 ||
 	    size > vpd->base.len - pos || size < 4)
@@ -231,7 +241,8 @@ static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
 	val |= ((u8) *buf++) << 16;
 	val |= ((u32)(u8) *buf++) << 24;
 
-	spin_lock_irq(&vpd->lock);
+	if (mutex_lock_killable(&vpd->lock))
+		return -EINTR;
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
@@ -247,7 +258,7 @@ static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
 	vpd->flag = 0;
 	ret = pci_vpd_pci22_wait(dev);
 out:
-	spin_unlock_irq(&vpd->lock);
+	mutex_unlock(&vpd->lock);
 	if (ret < 0)
 		return ret;
 
@@ -279,7 +290,7 @@ int pci_vpd_pci22_init(struct pci_dev *dev)
 
 	vpd->base.len = PCI_VPD_PCI22_SIZE;
 	vpd->base.ops = &pci_vpd_pci22_ops;
-	spin_lock_init(&vpd->lock);
+	mutex_init(&vpd->lock);
 	vpd->cap = cap;
 	vpd->busy = false;
 	dev->vpd = &vpd->base;