From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F29FCC433E0 for ; Tue, 9 Jun 2020 00:49:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CAB1520760 for ; Tue, 9 Jun 2020 00:49:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591663792; bh=/WXHUUPc1w97z44Y0YVUkz4p30wFHJ30MGCDQ+SgazA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aTsc9dH3J9bQPhQYY3WljXp+XUADlVaXxYfs1b4+zUTewxiwbj+sv4iW0WVTDVJen CPdcyD/m5zftihQA4NGLKbXdODyIYKKqKqpvIw4KtmSsuKqREHV3phkykaWPbzypO8 Epd8ImOm1N9jXw6PN4KzknEfl3qyDqLBtwkwXmsg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387491AbgFIAtp (ORCPT ); Mon, 8 Jun 2020 20:49:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:56910 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728740AbgFHXKl (ORCPT ); Mon, 8 Jun 2020 19:10:41 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1DDF8208FE; Mon, 8 Jun 2020 23:10:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591657841; bh=/WXHUUPc1w97z44Y0YVUkz4p30wFHJ30MGCDQ+SgazA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=snqut+Tl/I+yd/9hD/fbPvVLEMVTIXg20kbpJsJfHLdMNak9uUFjDcs1/CdKm982P axEI+dM5VUtgpqtQ1Uw7Sp6Smw49Uha+cUUb/ms3pkaXXLbIprktRWumWPjWwNqYdr Q7TRwqhmGqNBN8jzkjeFUR01c5AnoVb9kEMcZC/k= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alex Elder , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.7 209/274] net: ipa: do not clear interrupt in gsi_channel_start() Date: Mon, 8 Jun 2020 19:05:02 -0400 Message-Id: <20200608230607.3361041-209-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200608230607.3361041-1-sashal@kernel.org> References: <20200608230607.3361041-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alex Elder [ Upstream commit 195ef57f870070cb02f2f3b99a63d69e8e8f798e ] In gsi_channel_start() there is harmless-looking comment "Clear the channel's event ring interrupt in case it's pending". The intent was to avoid getting spurious interrupts when first bringing up a channel. However we now use channel stop/start to implement suspend and resume, and an interrupt pending at the time we resume is actually something we don't want to ignore. The very first time we bring up the channel we do not expect an interrupt to be pending, and even if it were, the effect would simply be to schedule NAPI on that channel, which would find nothing to do, which is not a problem. Stop clearing any pending IEOB interrupt in gsi_channel_start(). That leaves one caller of the trivial function gsi_isr_ieob_clear(). Get rid of that function and just open-code it in gsi_isr_ieob() instead. This fixes a problem where suspend/resume IPA v4.2 would get stuck when resuming after a suspend. Signed-off-by: Alex Elder Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ipa/gsi.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c index 8d9ca1c335e8..043a675e1be1 100644 --- a/drivers/net/ipa/gsi.c +++ b/drivers/net/ipa/gsi.c @@ -238,11 +238,6 @@ static void gsi_irq_ieob_enable(struct gsi *gsi, u32 evt_ring_id) iowrite32(val, gsi->virt + GSI_CNTXT_SRC_IEOB_IRQ_MSK_OFFSET); } -static void gsi_isr_ieob_clear(struct gsi *gsi, u32 mask) -{ - iowrite32(mask, gsi->virt + GSI_CNTXT_SRC_IEOB_IRQ_CLR_OFFSET); -} - static void gsi_irq_ieob_disable(struct gsi *gsi, u32 evt_ring_id) { u32 val; @@ -756,7 +751,6 @@ static void gsi_channel_deprogram(struct gsi_channel *channel) int gsi_channel_start(struct gsi *gsi, u32 channel_id) { struct gsi_channel *channel = &gsi->channel[channel_id]; - u32 evt_ring_id = channel->evt_ring_id; int ret; mutex_lock(&gsi->mutex); @@ -765,9 +759,6 @@ int gsi_channel_start(struct gsi *gsi, u32 channel_id) mutex_unlock(&gsi->mutex); - /* Clear the channel's event ring interrupt in case it's pending */ - gsi_isr_ieob_clear(gsi, BIT(evt_ring_id)); - gsi_channel_thaw(channel); return ret; @@ -1071,7 +1062,7 @@ static void gsi_isr_ieob(struct gsi *gsi) u32 event_mask; event_mask = ioread32(gsi->virt + GSI_CNTXT_SRC_IEOB_IRQ_OFFSET); - gsi_isr_ieob_clear(gsi, event_mask); + iowrite32(event_mask, gsi->virt + GSI_CNTXT_SRC_IEOB_IRQ_CLR_OFFSET); while (event_mask) { u32 evt_ring_id = __ffs(event_mask); -- 2.25.1