linux-kernel - [PATCH v1 09/11] PCI/PM: Clean up pci_set_low_power

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Date:   Thu, 05 May 2022 20:15:34 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PCI <linux-pci@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH v1 09/11] PCI/PM: Clean up pci_set_low_power_state()

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

Make the following assorted non-essential changes in
pci_set_low_power_state():

 1. Drop two redundant checks from it (the caller takes care of these
    conditions).

 2. Change the log level of a messages printed by it to "debug",
    because it only indicates a programming mistake.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/pci/pci.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

Index: linux-pm/drivers/pci/pci.c
===================================================================
--- linux-pm.orig/drivers/pci/pci.c
+++ linux-pm/drivers/pci/pci.c
@@ -1341,16 +1341,9 @@ static int pci_set_low_power_state(struc
 {
 	u16 pmcsr;
 
-	/* Check if we're already there */
-	if (dev->current_state == state)
-		return 0;
-
 	if (!dev->pm_cap)
 		return -EIO;
 
-	if (state < PCI_D1 || state > PCI_D3hot)
-		return -EINVAL;
-
 	/*
 	 * Validate transition: We can enter D0 from any state, but if
 	 * we're already in a low-power state, we can only go deeper.  E.g.,
@@ -1358,7 +1351,7 @@ static int pci_set_low_power_state(struc
 	 * we'd have to go from D3 to D0, then to D1.
 	 */
 	if (dev->current_state <= PCI_D3cold && dev->current_state > state) {
-		pci_err(dev, "invalid power transition (from %s to %s)\n",
+		pci_dbg(dev, "Invalid power transition (from %s to %s)\n",
 			pci_power_name(dev->current_state),
 			pci_power_name(state));
 		return -EINVAL;