From patchwork Sun Jun 3 14:41:02 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 10445381 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CCFA2603B4 for ; Sun, 3 Jun 2018 15:19:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BC562289ED for ; Sun, 3 Jun 2018 15:19:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0F6A28ACB; Sun, 3 Jun 2018 15:19:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 54B23289ED for ; Sun, 3 Jun 2018 15:19:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751622AbeFCPTS (ORCPT ); Sun, 3 Jun 2018 11:19:18 -0400 Received: from 109-183-129-149.tmcz.cz ([109.183.129.149]:59028 "EHLO leontynka.twibright.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751585AbeFCPTR (ORCPT ); Sun, 3 Jun 2018 11:19:17 -0400 Received: from root by leontynka.twibright.com with local (Exim 4.89) (envelope-from ) id 1fPUD8-0003rx-Jh; Sun, 03 Jun 2018 16:42:22 +0200 Message-Id: <20180603144222.335724006@twibright.com> User-Agent: quilt/0.63-1 Date: Sun, 03 Jun 2018 16:41:02 +0200 From: Mikulas Patocka To: Mikulas Patocka , Bartlomiej Zolnierkiewicz , Dave Airlie , Bernie Thompson , Ladislav Michl Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH 09/21] udl-kms: use spin_lock_irq instead of spin_lock_irqsave References: <20180603144053.875668929@twibright.com> MIME-Version: 1.0 Content-Disposition: inline; filename=udlkms-spin-lock-irq.patch Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP spin_lock_irqsave and spin_unlock_irqrestore is inteded to be called from a context where it is unknown if interrupts are enabled or disabled (such as interrupt handlers). From a process context, we should call spin_lock_irq and spin_unlock_irq, that avoids the costly pushf and popf instructions. Signed-off-by: Mikulas Patocka --- drivers/gpu/drm/udl/udl_main.c | 10 ++++------ drivers/gpu/drm/udl/udl_modeset.c | 5 ++--- 2 files changed, 6 insertions(+), 9 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-4.16.12/drivers/gpu/drm/udl/udl_main.c =================================================================== --- linux-4.16.12.orig/drivers/gpu/drm/udl/udl_main.c 2018-05-31 11:17:01.000000000 +0200 +++ linux-4.16.12/drivers/gpu/drm/udl/udl_main.c 2018-05-31 11:17:01.000000000 +0200 @@ -170,7 +170,6 @@ static void udl_free_urb_list(struct drm struct list_head *node; struct urb_node *unode; struct urb *urb; - unsigned long flags; DRM_DEBUG("Waiting for completes and freeing all render urbs\n"); @@ -178,12 +177,12 @@ static void udl_free_urb_list(struct drm while (count--) { down(&udl->urbs.limit_sem); - spin_lock_irqsave(&udl->urbs.lock, flags); + spin_lock_irq(&udl->urbs.lock); node = udl->urbs.list.next; /* have reserved one with sem */ list_del_init(node); - spin_unlock_irqrestore(&udl->urbs.lock, flags); + spin_unlock_irq(&udl->urbs.lock); unode = list_entry(node, struct urb_node, entry); urb = unode->urb; @@ -268,7 +267,6 @@ struct urb *udl_get_urb(struct drm_devic struct list_head *entry; struct urb_node *unode; struct urb *urb = NULL; - unsigned long flags; /* Wait for an in-flight buffer to complete and get re-queued */ ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT); @@ -279,14 +277,14 @@ struct urb *udl_get_urb(struct drm_devic goto error; } - spin_lock_irqsave(&udl->urbs.lock, flags); + spin_lock_irq(&udl->urbs.lock); BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */ entry = udl->urbs.list.next; list_del_init(entry); udl->urbs.available--; - spin_unlock_irqrestore(&udl->urbs.lock, flags); + spin_unlock_irq(&udl->urbs.lock); unode = list_entry(entry, struct urb_node, entry); urb = unode->urb; Index: linux-4.16.12/drivers/gpu/drm/udl/udl_modeset.c =================================================================== --- linux-4.16.12.orig/drivers/gpu/drm/udl/udl_modeset.c 2018-05-31 11:17:01.000000000 +0200 +++ linux-4.16.12/drivers/gpu/drm/udl/udl_modeset.c 2018-05-31 11:17:01.000000000 +0200 @@ -366,7 +366,6 @@ static int udl_crtc_page_flip(struct drm { struct udl_framebuffer *ufb = to_udl_fb(fb); struct drm_device *dev = crtc->dev; - unsigned long flags; struct drm_framebuffer *old_fb = crtc->primary->fb; if (old_fb) { @@ -377,10 +376,10 @@ static int udl_crtc_page_flip(struct drm udl_handle_damage(ufb, 0, 0, fb->width, fb->height); - spin_lock_irqsave(&dev->event_lock, flags); + spin_lock_irq(&dev->event_lock); if (event) drm_crtc_send_vblank_event(crtc, event); - spin_unlock_irqrestore(&dev->event_lock, flags); + spin_unlock_irq(&dev->event_lock); crtc->primary->fb = fb; return 0;