linux-kernel - [PATCH v2 5/6] powerpc: powernv: ocxl: use lock guard for mutex

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Message-ID: <20250314114502.2083434-6-sshegde@linux.ibm.com>
Date: Fri, 14 Mar 2025 17:15:01 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: maddy@...ux.ibm.com, linuxppc-dev@...ts.ozlabs.org
Cc: sshegde@...ux.ibm.com, npiggin@...il.com, christophe.leroy@...roup.eu,
        mpe@...erman.id.au, peterz@...radead.org, fbarrat@...ux.ibm.com,
        ajd@...ux.ibm.com, mahesh@...ux.ibm.com, oohall@...il.com,
        hbathini@...ux.ibm.com, dhowells@...hat.com, haren@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/6] powerpc: powernv: ocxl: use lock guard for mutex

use guard(mutex) for scope based resource management of mutex.
This would make the code simpler and easier to maintain.

More details on lock guards can be found at
https://lore.kernel.org/all/20230612093537.614161713@infradead.org/T/#u

Signed-off-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
---
 arch/powerpc/platforms/powernv/ocxl.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/ocxl.c b/arch/powerpc/platforms/powernv/ocxl.c
index 64a9c7125c29..f8139948348e 100644
--- a/arch/powerpc/platforms/powernv/ocxl.c
+++ b/arch/powerpc/platforms/powernv/ocxl.c
@@ -172,12 +172,11 @@ static void pnv_ocxl_fixup_actag(struct pci_dev *dev)
 	if (phb->type != PNV_PHB_NPU_OCAPI)
 		return;
 
-	mutex_lock(&links_list_lock);
+	guard(mutex)(&links_list_lock);
 
 	link = find_link(dev);
 	if (!link) {
 		dev_warn(&dev->dev, "couldn't update actag information\n");
-		mutex_unlock(&links_list_lock);
 		return;
 	}
 
@@ -206,7 +205,6 @@ static void pnv_ocxl_fixup_actag(struct pci_dev *dev)
 	dev_dbg(&dev->dev, "total actags for function: %d\n",
 		link->fn_desired_actags[PCI_FUNC(dev->devfn)]);
 
-	mutex_unlock(&links_list_lock);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pnv_ocxl_fixup_actag);
 
@@ -253,12 +251,11 @@ int pnv_ocxl_get_actag(struct pci_dev *dev, u16 *base, u16 *enabled,
 {
 	struct npu_link *link;
 
-	mutex_lock(&links_list_lock);
+	guard(mutex)(&links_list_lock);
 
 	link = find_link(dev);
 	if (!link) {
 		dev_err(&dev->dev, "actag information not found\n");
-		mutex_unlock(&links_list_lock);
 		return -ENODEV;
 	}
 	/*
@@ -274,7 +271,6 @@ int pnv_ocxl_get_actag(struct pci_dev *dev, u16 *base, u16 *enabled,
 	*enabled   = link->fn_actags[PCI_FUNC(dev->devfn)].count;
 	*supported = link->fn_desired_actags[PCI_FUNC(dev->devfn)];
 
-	mutex_unlock(&links_list_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pnv_ocxl_get_actag);
@@ -293,12 +289,11 @@ int pnv_ocxl_get_pasid_count(struct pci_dev *dev, int *count)
 	 *
 	 * We only support one AFU-carrying function for now.
 	 */
-	mutex_lock(&links_list_lock);
+	guard(mutex)(&links_list_lock);
 
 	link = find_link(dev);
 	if (!link) {
 		dev_err(&dev->dev, "actag information not found\n");
-		mutex_unlock(&links_list_lock);
 		return -ENODEV;
 	}
 
@@ -309,7 +304,6 @@ int pnv_ocxl_get_pasid_count(struct pci_dev *dev, int *count)
 			break;
 		}
 
-	mutex_unlock(&links_list_lock);
 	dev_dbg(&dev->dev, "%d PASIDs available for function\n",
 		rc ? 0 : *count);
 	return rc;
-- 
2.39.3