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Fri, 14 Mar 2025 05:46:22 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7BE3B2004E; Fri, 14 Mar 2025 05:46:22 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0982A20043; Fri, 14 Mar 2025 05:46:19 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.39.22.126]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Mar 2025 05:46:18 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: sshegde@linux.ibm.com, npiggin@gmail.com, christophe.leroy@csgroup.eu, mpe@ellerman.id.au, peterz@infradead.org, fbarrat@linux.ibm.com, ajd@linux.ibm.com, mahesh@linux.ibm.com, oohall@gmail.com, hbathini@linux.ibm.com, dhowells@redhat.com, haren@linux.ibm.com, linux-kernel@vger.kernel.org Subject: [PATCH 4/6] powerpc: book3s: vas: use lock guard for mutex Date: Fri, 14 Mar 2025 11:15:42 +0530 Message-ID: <20250314054544.1998928-5-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250314054544.1998928-1-sshegde@linux.ibm.com> References: <20250314054544.1998928-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: MTYBMPTK44BLY-d_dLxUWXy3Ux07JK09 X-Proofpoint-ORIG-GUID: bAwwU9RXnhl8ikrbv8vkFXqPGf_ZU3xR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-14_01,2025-03-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=872 clxscore=1015 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503140041 Content-Type: text/plain; charset="utf-8" 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 There is also an example of using scoped_guard.=20 Signed-off-by: Shrikanth Hegde --- arch/powerpc/platforms/book3s/vas-api.c | 19 ++++++------------- 1 file changed, 6 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/platforms/book3s/vas-api.c b/arch/powerpc/platfor= ms/book3s/vas-api.c index 0b6365d85d11..eb1a97271afb 100644 --- a/arch/powerpc/platforms/book3s/vas-api.c +++ b/arch/powerpc/platforms/book3s/vas-api.c @@ -425,7 +425,7 @@ static vm_fault_t vas_mmap_fault(struct vm_fault *vmf) return VM_FAULT_SIGBUS; } =20 - mutex_lock(&txwin->task_ref.mmap_mutex); + guard(mutex)(&txwin->task_ref.mmap_mutex); /* * The window may be inactive due to lost credit (Ex: core * removal with DLPAR). If the window is active again when @@ -437,11 +437,9 @@ static vm_fault_t vas_mmap_fault(struct vm_fault *vmf) if (paste_addr) { fault =3D vmf_insert_pfn(vma, vma->vm_start, (paste_addr >> PAGE_SHIFT)); - mutex_unlock(&txwin->task_ref.mmap_mutex); return fault; } } - mutex_unlock(&txwin->task_ref.mmap_mutex); =20 /* * Received this fault due to closing the actual window. @@ -494,9 +492,8 @@ static void vas_mmap_close(struct vm_area_struct *vma) return; } =20 - mutex_lock(&txwin->task_ref.mmap_mutex); - txwin->task_ref.vma =3D NULL; - mutex_unlock(&txwin->task_ref.mmap_mutex); + scoped_guard(mutex, &txwin->task_ref.mmap_mutex) + txwin->task_ref.vma =3D NULL; } =20 static const struct vm_operations_struct vas_vm_ops =3D { @@ -543,18 +540,16 @@ static int coproc_mmap(struct file *fp, struct vm_are= a_struct *vma) * close/open event and allows mmap() only when the window is * active. */ - mutex_lock(&txwin->task_ref.mmap_mutex); + guard(mutex)(&txwin->task_ref.mmap_mutex); if (txwin->status !=3D VAS_WIN_ACTIVE) { pr_err("Window is not active\n"); - rc =3D -EACCES; - goto out; + return -EACCES; } =20 paste_addr =3D cp_inst->coproc->vops->paste_addr(txwin); if (!paste_addr) { pr_err("Window paste address failed\n"); - rc =3D -EINVAL; - goto out; + return -EINVAL; } =20 pfn =3D paste_addr >> PAGE_SHIFT; @@ -574,8 +569,6 @@ static int coproc_mmap(struct file *fp, struct vm_area_= struct *vma) txwin->task_ref.vma =3D vma; vma->vm_ops =3D &vas_vm_ops; =20 -out: - mutex_unlock(&txwin->task_ref.mmap_mutex); return rc; } =20 --=20 2.39.3