From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A4DF612AAF7; Tue, 14 May 2024 11:18:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715685482; cv=none; b=H6NB1WDeM5oAbBGNpYmZ4K+Kr/82s32E0QNSF50UIeD8RbhymHAdzQbNxG1DOZHk+fAuFDm2xNLbFrujAc61LjAAHQoqOqZgPb3CY8Y2tGj7Pauctp30Dcgf72HqPDjNZqMm2HdMyj71K7MZXFrvXqojO1D01JNYJpI3AEWNbL0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715685482; c=relaxed/simple; bh=gxxphhWjOPuPb7TNGFYgBnJ9dP758CzgsORz0Qn/wmk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mJr5DgzMPjVZleBsk5QrQWQDQzmBiiSmtcU60W38BCkcOkLn5Naw5piiVkCihzu1xbsStgsEJvsKz5zdIv/yZqc2LxKjErSF6WujfZLFknebdTNe/wtR5YDHwcsEZDwuCdbyT9BrCh9veFpjOe//35c+mOlI54a/Ber63w9uh/0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qKPNLr1r; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qKPNLr1r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8563BC2BD10; Tue, 14 May 2024 11:18:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1715685482; bh=gxxphhWjOPuPb7TNGFYgBnJ9dP758CzgsORz0Qn/wmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qKPNLr1r993P92uCiE3CgzhRB/PkuhgTcNKP+GjCWits9l/a/WfenOLJDbICE8ams ziVc1Qt+2xzDHZ+OSwUWekFUfVcqfXPCgaa9XQzkJUa4WYSFSC2vp3N6ZF94XnB8cb Qk7C+0bS7rbaBfjUITJHaB5QPtV+0zo32JYxx55Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Douglas Anderson , Stephen Boyd , Sasha Levin Subject: [PATCH 6.6 165/301] clk: Dont hold prepare_lock when calling kref_put() Date: Tue, 14 May 2024 12:17:16 +0200 Message-ID: <20240514101038.486874775@linuxfoundation.org> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240514101032.219857983@linuxfoundation.org> References: <20240514101032.219857983@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stephen Boyd [ Upstream commit 6f63af7511e7058f3fa4ad5b8102210741c9f947 ] We don't need to hold the prepare_lock when dropping a ref on a struct clk_core. The release function is only freeing memory and any code with a pointer reference has already unlinked anything pointing to the clk_core. This reduces the holding area of the prepare_lock a bit. Note that we also don't call free_clk() with the prepare_lock held. There isn't any reason to do that. Reviewed-by: Douglas Anderson Signed-off-by: Stephen Boyd Link: https://lore.kernel.org/r/20240325184204.745706-3-sboyd@kernel.org Signed-off-by: Sasha Levin --- drivers/clk/clk.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 4a67c0d4823cf..f8776065ad1f1 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -4523,7 +4523,8 @@ void clk_unregister(struct clk *clk) if (ops == &clk_nodrv_ops) { pr_err("%s: unregistered clock: %s\n", __func__, clk->core->name); - goto unlock; + clk_prepare_unlock(); + return; } /* * Assign empty clock ops for consumers that might still hold @@ -4557,11 +4558,10 @@ void clk_unregister(struct clk *clk) if (clk->core->protect_count) pr_warn("%s: unregistering protected clock: %s\n", __func__, clk->core->name); + clk_prepare_unlock(); kref_put(&clk->core->ref, __clk_release); free_clk(clk); -unlock: - clk_prepare_unlock(); } EXPORT_SYMBOL_GPL(clk_unregister); @@ -4720,13 +4720,11 @@ void __clk_put(struct clk *clk) if (clk->min_rate > 0 || clk->max_rate < ULONG_MAX) clk_set_rate_range_nolock(clk, 0, ULONG_MAX); - owner = clk->core->owner; - kref_put(&clk->core->ref, __clk_release); - clk_prepare_unlock(); + owner = clk->core->owner; + kref_put(&clk->core->ref, __clk_release); module_put(owner); - free_clk(clk); } -- 2.43.0