linux-kernel - [PATCH v1 2/2] PM: runtime: Relocate rpm_callback() right after __rpm

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Date:   Fri, 02 Dec 2022 15:32:09 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Tushar Nimkar <quic_tnimkar@...cinc.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Nitin Rawat <quic_nitirawa@...cinc.com>,
        Peter Wang <peter.wang@...iatek.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v1 2/2] PM: runtime: Relocate rpm_callback() right after __rpm_callback()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Because rpm_callback() is a wrapper around __rpm_callback(), and the
only caller of it after the change eliminating an invocation of it
from rpm_idle(), move the former next to the latter to make the code
a bit easier to follow.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/base/power/runtime.c |   64 +++++++++++++++++++++----------------------
 1 file changed, 32 insertions(+), 32 deletions(-)

Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -422,6 +422,38 @@ fail:
 }
 
 /**
+ * rpm_callback - Run a given runtime PM callback for a given device.
+ * @cb: Runtime PM callback to run.
+ * @dev: Device to run the callback for.
+ */
+static int rpm_callback(int (*cb)(struct device *), struct device *dev)
+{
+	int retval;
+
+	if (dev->power.memalloc_noio) {
+		unsigned int noio_flag;
+
+		/*
+		 * Deadlock might be caused if memory allocation with
+		 * GFP_KERNEL happens inside runtime_suspend and
+		 * runtime_resume callbacks of one block device's
+		 * ancestor or the block device itself. Network
+		 * device might be thought as part of iSCSI block
+		 * device, so network device and its ancestor should
+		 * be marked as memalloc_noio too.
+		 */
+		noio_flag = memalloc_noio_save();
+		retval = __rpm_callback(cb, dev);
+		memalloc_noio_restore(noio_flag);
+	} else {
+		retval = __rpm_callback(cb, dev);
+	}
+
+	dev->power.runtime_error = retval;
+	return retval != -EACCES ? retval : -EIO;
+}
+
+/**
  * rpm_idle - Notify device bus type if the device can be suspended.
  * @dev: Device to notify the bus type about.
  * @rpmflags: Flag bits.
@@ -505,38 +537,6 @@ static int rpm_idle(struct device *dev,
 }
 
 /**
- * rpm_callback - Run a given runtime PM callback for a given device.
- * @cb: Runtime PM callback to run.
- * @dev: Device to run the callback for.
- */
-static int rpm_callback(int (*cb)(struct device *), struct device *dev)
-{
-	int retval;
-
-	if (dev->power.memalloc_noio) {
-		unsigned int noio_flag;
-
-		/*
-		 * Deadlock might be caused if memory allocation with
-		 * GFP_KERNEL happens inside runtime_suspend and
-		 * runtime_resume callbacks of one block device's
-		 * ancestor or the block device itself. Network
-		 * device might be thought as part of iSCSI block
-		 * device, so network device and its ancestor should
-		 * be marked as memalloc_noio too.
-		 */
-		noio_flag = memalloc_noio_save();
-		retval = __rpm_callback(cb, dev);
-		memalloc_noio_restore(noio_flag);
-	} else {
-		retval = __rpm_callback(cb, dev);
-	}
-
-	dev->power.runtime_error = retval;
-	return retval != -EACCES ? retval : -EIO;
-}
-
-/**
  * rpm_suspend - Carry out runtime suspend of given device.
  * @dev: Device to suspend.
  * @rpmflags: Flag bits.