[POWERPC] PS3: Add repository polling loop to work around timing bug

PS3: Add repository polling loop to work around timing bug

On some firmware versions (e.g. 1.90), the storage device may not show up
in the repository immediately after receiving the notification message.
Add a small polling loop to make sure we don't miss it.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 33 insertions, 13 deletions

diff --git a/arch/powerpc/platforms/ps3/device-init.c b/arch/powerpc/platforms/ps3/device-init.c
index 5695e00219e..05c7c1c624d 100644
--- a/arch/powerpc/platforms/ps3/device-init.c
+++ b/arch/powerpc/platforms/ps3/device-init.c
@@ -489,6 +489,38 @@ static int ps3_register_repository_device(
 	return result;
 }
 
+static void ps3_find_and_add_device(u64 bus_id, u64 dev_id)
+{
+	struct ps3_repository_device repo;
+	int res;
+	unsigned int retries;
+	unsigned long rem;
+
+	/*
+	 * On some firmware versions (e.g. 1.90), the device may not show up
+	 * in the repository immediately
+	 */
+	for (retries = 0; retries < 10; retries++) {
+		res = ps3_repository_find_device_by_id(&repo, bus_id, dev_id);
+		if (!res)
+			goto found;
+
+		rem = msleep_interruptible(100);
+		if (rem)
+			break;
+	}
+	pr_warning("%s:%u: device %lu:%lu not found\n", __func__, __LINE__,
+		   bus_id, dev_id);
+	return;
+
+found:
+	if (retries)
+		pr_debug("%s:%u: device %lu:%lu found after %u retries\n",
+			 __func__, __LINE__, bus_id, dev_id, retries);
+
+	ps3_register_repository_device(&repo);
+	return;
+}
 
 #define PS3_NOTIFICATION_DEV_ID		ULONG_MAX
 #define PS3_NOTIFICATION_INTERRUPT_ID	0
@@ -600,7 +632,6 @@ static struct task_struct *probe_task;
 static int ps3_probe_thread(void *data)
 {
 	struct ps3_notification_device dev;
-	struct ps3_repository_device repo;
 	int res;
 	unsigned int irq;
 	u64 lpar;
@@ -682,18 +713,7 @@ static int ps3_probe_thread(void *data)
 			continue;
 		}
 
-		res = ps3_repository_find_device_by_id(&repo, dev.sbd.bus_id,
-						       notify_event->dev_id);
-		if (res) {
-			pr_warning("%s:%u: device %lu:%lu not found\n",
-				   __func__, __LINE__, dev.sbd.bus_id,
-				   notify_event->dev_id);
-			continue;
-		}
-
-		pr_debug("%s:%u: device %lu:%lu found\n", __func__, __LINE__,
-			 dev.sbd.bus_id, notify_event->dev_id);
-		ps3_register_repository_device(&repo);
+		ps3_find_and_add_device(dev.sbd.bus_id, notify_event->dev_id);
 
 	} while (!kthread_should_stop());