From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 CB3A93E4C84 for ; Wed, 18 Mar 2026 18:40:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773859237; cv=none; b=rPqguruNIos0P9rpeYrSDtQjIoRxcDdfneMZ3/Yu701fmKEFVR8Ash2EEC2iWEswOGS62RlQrUMK6eUYFL2bOGLT30FJpI8WZWZI4c4TFA8Ti/FAjV/AGpWTcQmyX4jYO5ODu4RVW0s6s0c83k97kxNs5soljhirBy0lHqBtUdE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773859237; c=relaxed/simple; bh=HqNKUdNi7W6vU9/414qvIcDSDKsy4JoCcmsrd6BuqAc=; h=Date:From:To:Cc:Subject:Message-ID; b=D1i/Ao+/EfuZhUrUVuJITzVJ/7iJBBLsDUe+OEV0VAVoOq3JqUC7a2djIDUPy2YYOWEwaQE7G12oDg0RqrnIdEqcADAgmsav+ZvIuslK6SOlcWsbMjjzmRKbxyjkRLitMjTIegtRhA3LdIf6pNOE+jCs/8vcyIt6XDHrf5iPFBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Yj3w/GB3; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Yj3w/GB3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1773859233; x=1805395233; h=date:from:to:cc:subject:message-id; bh=HqNKUdNi7W6vU9/414qvIcDSDKsy4JoCcmsrd6BuqAc=; b=Yj3w/GB30BgWNtjR++Fv0Ia9Vklxr2GHxDfWEBJBAz9WKsJMVgwWWyTB GcL45Xu6Ezcy+CWK9spcHXJSFdCTnsnixYRZW9oSPBYFalrDTD79rid4V lMVXqNXFjYkUphOHoOcXEo1MhzDbqFRo8cDwnuNzB49xpj6IZ2j81Bt67 0I6DQqXrM8fbFpf3CK5ovYcGgJZI7FhxWnoMHrMWAooyvmKDfr5hFGOcF wkVDOyy0lccZf3Lin/rEa8RaFfwYy62B/Y+ir/9EP3C58ZV8Pr2rr8hP/ VtZ7/dSikc/Hi4/UEbFqolezRrixPWVYXgENBlUUKQl3YQcUzC01amAdP g==; X-CSE-ConnectionGUID: talDhP+bRrObXc85Hk+PzA== X-CSE-MsgGUID: 2WBuXhiPT2KzyJXWt5GEvg== X-IronPort-AV: E=McAfee;i="6800,10657,11733"; a="86402930" X-IronPort-AV: E=Sophos;i="6.23,127,1770624000"; d="scan'208";a="86402930" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Mar 2026 11:40:32 -0700 X-CSE-ConnectionGUID: WNwIgcssQga+tLz53m5k7Q== X-CSE-MsgGUID: r+HR8damQo25xUJ5FVwArA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,127,1770624000"; d="scan'208";a="247144272" Received: from lkp-server01.sh.intel.com (HELO 63737dd503cb) ([10.239.97.150]) by fmviesa001.fm.intel.com with ESMTP; 18 Mar 2026 11:40:30 -0700 Received: from kbuild by 63737dd503cb with local (Exim 4.98.2) (envelope-from ) id 1w2voh-000000003Gf-3LTc; Wed, 18 Mar 2026 18:40:27 +0000 Date: Thu, 19 Mar 2026 02:40:15 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [linux-next:master 6296/7246] drivers/dma/sh/rz-dmac.c:726 rz_dmac_chan_get_residue() warn: can 'current_desc' even be NULL? Message-ID: <202603190250.VAmYUWk2-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: Biju Das CC: Vinod Koul CC: Long Luu CC: Claudiu Beznea CC: Frank Li tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8e42d2514a7e8eb8d740d0ba82339dd6c0b6463f commit: 21323b118c16d287355e6497e1098ce1ca348bd6 [6296/7246] dmaengine: sh: rz-dmac: Add device_tx_status() callback :::::: branch date: 2 hours ago :::::: commit date: 32 hours ago config: m68k-randconfig-r073-20260318 (https://download.01.org/0day-ci/archive/20260319/202603190250.VAmYUWk2-lkp@intel.com/config) compiler: m68k-linux-gcc (GCC) 13.4.0 smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202603190250.VAmYUWk2-lkp@intel.com/ smatch warnings: drivers/dma/sh/rz-dmac.c:726 rz_dmac_chan_get_residue() warn: can 'current_desc' even be NULL? vim +/current_desc +726 drivers/dma/sh/rz-dmac.c 21323b118c16d2 Biju Das 2026-03-16 715 21323b118c16d2 Biju Das 2026-03-16 716 static u32 rz_dmac_chan_get_residue(struct rz_dmac_chan *channel, 21323b118c16d2 Biju Das 2026-03-16 717 dma_cookie_t cookie) 21323b118c16d2 Biju Das 2026-03-16 718 { 21323b118c16d2 Biju Das 2026-03-16 719 struct rz_dmac_desc *current_desc, *desc; 21323b118c16d2 Biju Das 2026-03-16 720 enum dma_status status; 21323b118c16d2 Biju Das 2026-03-16 721 u32 crla, crtb, i; 21323b118c16d2 Biju Das 2026-03-16 722 21323b118c16d2 Biju Das 2026-03-16 723 /* Get current processing virtual descriptor */ 21323b118c16d2 Biju Das 2026-03-16 724 current_desc = list_first_entry(&channel->ld_active, 21323b118c16d2 Biju Das 2026-03-16 725 struct rz_dmac_desc, node); 21323b118c16d2 Biju Das 2026-03-16 @726 if (!current_desc) 21323b118c16d2 Biju Das 2026-03-16 727 return 0; 21323b118c16d2 Biju Das 2026-03-16 728 21323b118c16d2 Biju Das 2026-03-16 729 /* 21323b118c16d2 Biju Das 2026-03-16 730 * If the cookie corresponds to a descriptor that has been completed 21323b118c16d2 Biju Das 2026-03-16 731 * there is no residue. The same check has already been performed by the 21323b118c16d2 Biju Das 2026-03-16 732 * caller but without holding the channel lock, so the descriptor could 21323b118c16d2 Biju Das 2026-03-16 733 * now be complete. 21323b118c16d2 Biju Das 2026-03-16 734 */ 21323b118c16d2 Biju Das 2026-03-16 735 status = dma_cookie_status(&channel->vc.chan, cookie, NULL); 21323b118c16d2 Biju Das 2026-03-16 736 if (status == DMA_COMPLETE) 21323b118c16d2 Biju Das 2026-03-16 737 return 0; 21323b118c16d2 Biju Das 2026-03-16 738 21323b118c16d2 Biju Das 2026-03-16 739 /* 21323b118c16d2 Biju Das 2026-03-16 740 * If the cookie doesn't correspond to the currently processing virtual 21323b118c16d2 Biju Das 2026-03-16 741 * descriptor then the descriptor hasn't been processed yet, and the 21323b118c16d2 Biju Das 2026-03-16 742 * residue is equal to the full descriptor size. Also, a client driver 21323b118c16d2 Biju Das 2026-03-16 743 * is possible to call this function before rz_dmac_irq_handler_thread() 21323b118c16d2 Biju Das 2026-03-16 744 * runs. In this case, the running descriptor will be the next 21323b118c16d2 Biju Das 2026-03-16 745 * descriptor, and will appear in the done list. So, if the argument 21323b118c16d2 Biju Das 2026-03-16 746 * cookie matches the done list's cookie, we can assume the residue is 21323b118c16d2 Biju Das 2026-03-16 747 * zero. 21323b118c16d2 Biju Das 2026-03-16 748 */ 21323b118c16d2 Biju Das 2026-03-16 749 if (cookie != current_desc->vd.tx.cookie) { 21323b118c16d2 Biju Das 2026-03-16 750 list_for_each_entry(desc, &channel->ld_free, node) { 21323b118c16d2 Biju Das 2026-03-16 751 if (cookie == desc->vd.tx.cookie) 21323b118c16d2 Biju Das 2026-03-16 752 return 0; 21323b118c16d2 Biju Das 2026-03-16 753 } 21323b118c16d2 Biju Das 2026-03-16 754 21323b118c16d2 Biju Das 2026-03-16 755 list_for_each_entry(desc, &channel->ld_queue, node) { 21323b118c16d2 Biju Das 2026-03-16 756 if (cookie == desc->vd.tx.cookie) 21323b118c16d2 Biju Das 2026-03-16 757 return desc->len; 21323b118c16d2 Biju Das 2026-03-16 758 } 21323b118c16d2 Biju Das 2026-03-16 759 21323b118c16d2 Biju Das 2026-03-16 760 list_for_each_entry(desc, &channel->ld_active, node) { 21323b118c16d2 Biju Das 2026-03-16 761 if (cookie == desc->vd.tx.cookie) 21323b118c16d2 Biju Das 2026-03-16 762 return desc->len; 21323b118c16d2 Biju Das 2026-03-16 763 } 21323b118c16d2 Biju Das 2026-03-16 764 21323b118c16d2 Biju Das 2026-03-16 765 /* 21323b118c16d2 Biju Das 2026-03-16 766 * No descriptor found for the cookie, there's thus no residue. 21323b118c16d2 Biju Das 2026-03-16 767 * This shouldn't happen if the calling driver passes a correct 21323b118c16d2 Biju Das 2026-03-16 768 * cookie value. 21323b118c16d2 Biju Das 2026-03-16 769 */ 21323b118c16d2 Biju Das 2026-03-16 770 WARN(1, "No descriptor for cookie!"); 21323b118c16d2 Biju Das 2026-03-16 771 return 0; 21323b118c16d2 Biju Das 2026-03-16 772 } 21323b118c16d2 Biju Das 2026-03-16 773 21323b118c16d2 Biju Das 2026-03-16 774 /* 21323b118c16d2 Biju Das 2026-03-16 775 * We need to read two registers. Make sure the hardware does not move 21323b118c16d2 Biju Das 2026-03-16 776 * to next lmdesc while reading the current lmdesc. Trying it 3 times 21323b118c16d2 Biju Das 2026-03-16 777 * should be enough: initial read, retry, retry for the paranoid. 21323b118c16d2 Biju Das 2026-03-16 778 */ 21323b118c16d2 Biju Das 2026-03-16 779 for (i = 0; i < 3; i++) { 21323b118c16d2 Biju Das 2026-03-16 780 crla = rz_dmac_ch_readl(channel, CRLA, 1); 21323b118c16d2 Biju Das 2026-03-16 781 crtb = rz_dmac_ch_readl(channel, CRTB, 1); 21323b118c16d2 Biju Das 2026-03-16 782 /* Still the same? */ 21323b118c16d2 Biju Das 2026-03-16 783 if (crla == rz_dmac_ch_readl(channel, CRLA, 1)) 21323b118c16d2 Biju Das 2026-03-16 784 break; 21323b118c16d2 Biju Das 2026-03-16 785 } 21323b118c16d2 Biju Das 2026-03-16 786 21323b118c16d2 Biju Das 2026-03-16 787 WARN_ONCE(i >= 3, "residue might not be continuous!"); 21323b118c16d2 Biju Das 2026-03-16 788 21323b118c16d2 Biju Das 2026-03-16 789 /* 21323b118c16d2 Biju Das 2026-03-16 790 * Calculate number of bytes transferred in processing virtual descriptor. 21323b118c16d2 Biju Das 2026-03-16 791 * One virtual descriptor can have many lmdesc. 21323b118c16d2 Biju Das 2026-03-16 792 */ 21323b118c16d2 Biju Das 2026-03-16 793 return crtb + rz_dmac_calculate_residue_bytes_in_vd(channel, crla); 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Thu, 19 Mar 2026 01:55:20 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-486f8ba4baesm74549945e9.13.2026.03.19.01.55.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Mar 2026 01:55:19 -0700 (PDT) Date: Thu, 19 Mar 2026 11:55:15 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Biju Das Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, Vinod Koul , Long Luu , Claudiu Beznea , Frank Li Subject: [linux-next:master 6296/7246] drivers/dma/sh/rz-dmac.c:726 rz_dmac_chan_get_residue() warn: can 'current_desc' even be NULL? Message-ID: <202603190250.VAmYUWk2-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Message-ID: <20260319085515.aRRhzWxA5nPDBpqn4ECjsjkiJ2rR89zgw61JIlJL21I@z> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8e42d2514a7e8eb8d740d0ba82339dd6c0b6463f commit: 21323b118c16d287355e6497e1098ce1ca348bd6 [6296/7246] dmaengine: sh: rz-dmac: Add device_tx_status() callback config: m68k-randconfig-r073-20260318 (https://download.01.org/0day-ci/archive/20260319/202603190250.VAmYUWk2-lkp@intel.com/config) compiler: m68k-linux-gcc (GCC) 13.4.0 smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202603190250.VAmYUWk2-lkp@intel.com/ smatch warnings: drivers/dma/sh/rz-dmac.c:726 rz_dmac_chan_get_residue() warn: can 'current_desc' even be NULL? vim +/current_desc +726 drivers/dma/sh/rz-dmac.c 21323b118c16d2 Biju Das 2026-03-16 716 static u32 rz_dmac_chan_get_residue(struct rz_dmac_chan *channel, 21323b118c16d2 Biju Das 2026-03-16 717 dma_cookie_t cookie) 21323b118c16d2 Biju Das 2026-03-16 718 { 21323b118c16d2 Biju Das 2026-03-16 719 struct rz_dmac_desc *current_desc, *desc; 21323b118c16d2 Biju Das 2026-03-16 720 enum dma_status status; 21323b118c16d2 Biju Das 2026-03-16 721 u32 crla, crtb, i; 21323b118c16d2 Biju Das 2026-03-16 722 21323b118c16d2 Biju Das 2026-03-16 723 /* Get current processing virtual descriptor */ 21323b118c16d2 Biju Das 2026-03-16 724 current_desc = list_first_entry(&channel->ld_active, 21323b118c16d2 Biju Das 2026-03-16 725 struct rz_dmac_desc, node); 21323b118c16d2 Biju Das 2026-03-16 @726 if (!current_desc) 21323b118c16d2 Biju Das 2026-03-16 727 return 0; Use list_first_entry_or_null() if you're not sure whether the list is empty. list_first_entry() never returns NULL. 21323b118c16d2 Biju Das 2026-03-16 728 21323b118c16d2 Biju Das 2026-03-16 729 /* 21323b118c16d2 Biju Das 2026-03-16 730 * If the cookie corresponds to a descriptor that has been completed 21323b118c16d2 Biju Das 2026-03-16 731 * there is no residue. The same check has already been performed by the 21323b118c16d2 Biju Das 2026-03-16 732 * caller but without holding the channel lock, so the descriptor could 21323b118c16d2 Biju Das 2026-03-16 733 * now be complete. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki