Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757232Ab3IYAgP (ORCPT ); Tue, 24 Sep 2013 20:36:15 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:39639 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756610Ab3IYAUd (ORCPT ); Tue, 24 Sep 2013 20:20:33 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Larry Finger , Brett Rudley , "Franky (Zhenhui) Lin" , Hante Meuleman , Arend van Spriel , "John W. Linville" , brcm80211-dev-list@broadcom.com Subject: [ 065/117] brcmsmac: Fix WARNING caused by lack of calls to dma_mapping_error() Date: Tue, 24 Sep 2013 17:18:51 -0700 Message-Id: <20130925001747.963788063@linuxfoundation.org> X-Mailer: git-send-email 1.8.4.3.gca3854a In-Reply-To: <20130925001740.833541979@linuxfoundation.org> References: <20130925001740.833541979@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5350 Lines: 109 3.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: "John W. Linville" commit 67d0cf50bd32b66eab709871714e55725ee30ce4 upstream. The driver fails to check the results of DMA mapping in twp places, which results in the following warning: [ 28.078515] ------------[ cut here ]------------ [ 28.078529] WARNING: at lib/dma-debug.c:937 check_unmap+0x47e/0x930() [ 28.078533] bcma-pci-bridge 0000:0e:00.0: DMA-API: device driver failed to check map error[device address=0x00000000b5d60d6c] [size=1876 bytes] [mapped as single] [ 28.078536] Modules linked in: bnep bluetooth vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) ipv6 b43 brcmsmac rtl8192cu rtl8192c_common rtlwifi mac802 11 brcmutil cfg80211 snd_hda_codec_conexant rng_core snd_hda_intel kvm_amd snd_hda_codec ssb kvm mmc_core snd_pcm snd_seq snd_timer snd_seq_device snd k8temp cordic joydev serio_raw hwmon sr_mod sg pcmcia pcmcia_core soundcore cdrom i2c_nforce2 i2c_core forcedeth bcma snd_page_alloc autofs4 ext4 jbd2 mbcache crc1 6 scsi_dh_alua scsi_dh_hp_sw scsi_dh_rdac scsi_dh_emc scsi_dh ata_generic pata_amd [ 28.078602] CPU: 1 PID: 2570 Comm: NetworkManager Tainted: G O 3.10.0-rc7-wl+ #42 [ 28.078605] Hardware name: Hewlett-Packard HP Pavilion dv2700 Notebook PC/30D6, BIOS F.27 11/27/2008 [ 28.078607] 0000000000000009 ffff8800bbb03ad8 ffffffff8144f898 ffff8800bbb03b18 [ 28.078612] ffffffff8103e1eb 0000000000000002 ffff8800b719f480 ffff8800b7b9c010 [ 28.078617] ffffffff824204c0 ffffffff81754d57 0000000000000754 ffff8800bbb03b78 [ 28.078622] Call Trace: [ 28.078624] [] dump_stack+0x19/0x1b [ 28.078634] [] warn_slowpath_common+0x6b/0xa0 [ 28.078638] [] warn_slowpath_fmt+0x41/0x50 [ 28.078650] [] check_unmap+0x47e/0x930 [ 28.078655] [] debug_dma_unmap_page+0x5c/0x70 [ 28.078679] [] dma64_getnextrxp+0x10c/0x190 [brcmsmac] [ 28.078691] [] dma_rx+0x62/0x240 [brcmsmac] [ 28.078707] [] brcms_c_dpc+0x211/0x9d0 [brcmsmac] [ 28.078717] [] ? brcms_dpc+0x27/0xf0 [brcmsmac] [ 28.078731] [] brcms_dpc+0x47/0xf0 [brcmsmac] [ 28.078736] [] tasklet_action+0x6c/0xf0 --snip-- [ 28.078974] [] SyS_sendmsg+0xd/0x20 [ 28.078979] [] tracesys+0xdd/0xe2 [ 28.078982] ---[ end trace 6164d1a08148e9c8 ]--- [ 28.078984] Mapped at: [ 28.078985] [] debug_dma_map_page+0x9d/0x150 [ 28.078989] [] dma_rxfill+0x102/0x3d0 [brcmsmac] [ 28.079001] [] brcms_c_init+0x87d/0x1100 [brcmsmac] [ 28.079010] [] brcms_init+0x21/0x30 [brcmsmac] [ 28.079018] [] brcms_c_up+0x150/0x430 [brcmsmac] As the patch adds a new failure mechanism to dma_rxfill(). When I changed the comment at the start of the routine to add that information, I also polished the wording. Signed-off-by: Larry Finger Cc: Brett Rudley Cc: Franky (Zhenhui) Lin Cc: Hante Meuleman Cc: brcm80211-dev-list@broadcom.com Acked-by: Arend van Spriel Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/brcm80211/brcmsmac/dma.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/drivers/net/wireless/brcm80211/brcmsmac/dma.c +++ b/drivers/net/wireless/brcm80211/brcmsmac/dma.c @@ -1015,9 +1015,10 @@ static bool dma64_txidle(struct dma_info /* * post receive buffers - * return false is refill failed completely and ring is empty this will stall - * the rx dma and user might want to call rxfill again asap. This unlikely - * happens on memory-rich NIC, but often on memory-constrained dongle + * Return false if refill failed completely or dma mapping failed. The ring + * is empty, which will stall the rx dma and user might want to call rxfill + * again asap. This is unlikely to happen on a memory-rich NIC, but often on + * memory-constrained dongle. */ bool dma_rxfill(struct dma_pub *pub) { @@ -1078,6 +1079,8 @@ bool dma_rxfill(struct dma_pub *pub) pa = dma_map_single(di->dmadev, p->data, di->rxbufsize, DMA_FROM_DEVICE); + if (dma_mapping_error(di->dmadev, pa)) + return false; /* save the free packet pointer */ di->rxp[rxout] = p; @@ -1284,7 +1287,11 @@ static void dma_txenq(struct dma_info *d /* get physical address of buffer start */ pa = dma_map_single(di->dmadev, data, len, DMA_TO_DEVICE); - + /* if mapping failed, free skb */ + if (dma_mapping_error(di->dmadev, pa)) { + brcmu_pkt_buf_free_skb(p); + return; + } /* With a DMA segment list, Descriptor table is filled * using the segment list instead of looping over * buffers in multi-chain DMA. 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