From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 686E344AB66 for ; Tue, 4 Aug 2026 23:54:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785887675; cv=none; b=p/RinaPu7g1xaS0HdjXvQFyzuy6rV2PtxbT8VxfYwXgycCbtetnehYioq57DWuqG6MBXUMrqDHLKK7+wM/007tqjHl4hbpSdYf/ZNlOw88cGasf2E9Yy4iMG+S2D3fFwS0EPF7MzZNCkfIuSNUoZa9jTz1/b39uh/tYVrdkINP0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785887675; c=relaxed/simple; bh=wvs5/3Vc8ATiENqbwg9FKEU2eKqwenz/FQk2i2ewikk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=m2vD1W3+byYhavwhpxg9Pm42Q68ng/amOX0tRgpqJPl19jH/aTcW0A7NQfV+rJCPtyqK9JKCSiEzbPv9/uPHaowhWiz1vp/Ea5tWrzQRzKP7pOLZDTI1Af24xdSBrdZ6gVnEnW6bVR89tzXhuoaH3UF3RBIopJ7nkpL4aBGxjQ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=e/wUSe9H; arc=none smtp.client-ip=192.198.163.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="e/wUSe9H" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785887673; x=1817423673; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=wvs5/3Vc8ATiENqbwg9FKEU2eKqwenz/FQk2i2ewikk=; b=e/wUSe9HiV+DLPYqnunMgodpkfRnhfawuGHjE/zV0H/F+vDxNVaImBIm f5waLkiL8Cp2qGnys2kUF3Xe719dGZmreyQlbIu8Z8wPmrgZ5Y8CNr6gM ojtx7cCrYcSs7eh24BAFqYqqxmvFvvyvLJ9boCNpWMvL7M3wAn2tnlAQ5 LHFZrVptwGxGSIPkRxXrWHefqfORZdnGVAu1z1k1vjFuSDOgEiDdOqPaf 6iHPYa2ctDh5YcuCdSrYfmr4lv5/AKrwALQTOJ6RzNR8AHZE58mrBbwM+ rxsbpOInwPTLaMZROEzb1dYzpCAeHFv6/rYQRqCmiVKpyhehrltr7AD3B w==; X-CSE-ConnectionGUID: ac98WnNJRi2z/SSoMpsZWQ== X-CSE-MsgGUID: sajR+I/kSiaKRSyBVHaYWw== X-IronPort-AV: E=McAfee;i="6800,10657,11865"; a="90263219" X-IronPort-AV: E=Sophos;i="6.25,205,1779174000"; d="scan'208";a="90263219" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Aug 2026 16:54:32 -0700 X-CSE-ConnectionGUID: rE9v6iQqTuu/ww1Z+8UMKA== X-CSE-MsgGUID: ZeV1DN5CQsmYMzngrZjmBA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,205,1779174000"; d="scan'208";a="257324328" Received: from allen-box.sh.intel.com ([10.239.159.52]) by fmviesa006.fm.intel.com with ESMTP; 04 Aug 2026 16:54:30 -0700 From: Lu Baolu To: Joerg Roedel Cc: ZhaoJinming , Kevin Tian , Dmitry Antipov , Guanghui Feng , Li RongQing , Desnes Nunes , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 04/19] iommu/vt-d: Use kstrtoint_from_user() in dmar_perf_latency_write() Date: Wed, 5 Aug 2026 07:42:58 +0800 Message-ID: <20260804234314.3087110-5-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260804234314.3087110-1-baolu.lu@linux.intel.com> References: <20260804234314.3087110-1-baolu.lu@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Dmitry Antipov Simplify 'dmar_perf_latency_write()' by using the convenient 'kstrtoint_from_user()'. Signed-off-by: Dmitry Antipov Signed-off-by: Lu Baolu --- drivers/iommu/intel/debugfs.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c index 21e4e465ca58..d87408ebb830 100644 --- a/drivers/iommu/intel/debugfs.c +++ b/drivers/iommu/intel/debugfs.c @@ -690,19 +690,11 @@ static ssize_t dmar_perf_latency_write(struct file *filp, { struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; - int counting; - char buf[64]; + int ret, counting; - if (cnt > 63) - cnt = 63; - - if (copy_from_user(&buf, ubuf, cnt)) - return -EFAULT; - - buf[cnt] = 0; - - if (kstrtoint(buf, 0, &counting)) - return -EINVAL; + ret = kstrtoint_from_user(ubuf, cnt, 0, &counting); + if (ret) + return ret; switch (counting) { case 0: -- 2.43.0