WARNING: at lib/dma-debug.c:866 check_for_stack
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From: Zdenek Kabelac on 14 May 2010 05:00 Hi I've noticed my dvb-t tuner reports this Warning about stack usage for DMA. Is there some fix already available ? dib0700: loaded with support for 14 different device-types ------------[ cut here ]------------ WARNING: at lib/dma-debug.c:866 check_for_stack+0xa4/0xe0() Hardware name: 6464CTO ehci_hcd 0000:00:1a.7: DMA-API: device driver maps memory fromstack [addr=ffff8800a5083c68] Modules linked in: dvb_usb_dib0700(+) dib7000p dib7000m dib0070 dvb_usb dib8000 dvb_core dib3000mc dibx000_common aes_generic hidp rfcomm sco l2cap tun nfsd lockd nfs_acl auth_rpcgss exportfs ip6_tables xt_tcpudp bridge stp llc autofs4 sunrpc ipv6 ipt_REJECT xt_physdev xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables binfmt_misc loop dm_mirror dm_region_hash dm_log dm_mod kvm_intel kvm i915 drm_kms_helper drm i2c_algo_bit uinput arc4 ecb cryptomgr snd_hda_codec_analog snd_hda_intel snd_hda_codec crypto_hash aead pcompress snd_seq crypto_blkcipher crypto_algapi iwl3945 snd_seq_device snd_pcm iwlcore sdhci_pci sdhci thinkpad_acpi btusb snd_timer mac80211 snd mmc_core cfg80211 bluetooth rtc_cmos psmouse rtc_core soundcore i2c_i801 snd_page_alloc led_class iTCO_wdt rtc_lib i2c_core nvram serio_raw iTCO_vendor_support rfkill e1000e evdev battery ac usbhid hid sr_mod cdrom ehci_hcd uhci_hcd usbcore video backlight output button [last unloaded: scsi_wait_scan] Pid: 14621, comm: modprobe Not tainted 2.6.34-rc7-00017-gc41ef37 #69 Call Trace: [<ffffffff8104af2b>] warn_slowpath_common+0x7b/0xc0 [<ffffffff8104afd1>] warn_slowpath_fmt+0x41/0x50 [<ffffffff81436b19>] ? sub_preempt_count+0xa9/0xe0 [<ffffffff8126d904>] check_for_stack+0xa4/0xe0 [<ffffffff8126db9d>] debug_dma_map_page+0xfd/0x160 [<ffffffffa002a508>] dma_map_single_attrs.clone.2+0xc8/0x100 [usbcore] [<ffffffffa002ac06>] usb_hcd_submit_urb+0x6c6/0x8c0 [usbcore] [<ffffffff81080144>] ? static_obj+0x44/0x60 [<ffffffff81081929>] ? lockdep_init_map+0x59/0x150 [<ffffffff81433070>] ? _raw_spin_unlock_irq+0x30/0x60 [<ffffffffa002b3e6>] usb_submit_urb+0xd6/0x260 [usbcore] [<ffffffffa002c78c>] usb_start_wait_urb+0x6c/0x100 [usbcore] [<ffffffffa002ba28>] ? usb_init_urb+0x28/0x40 [usbcore] [<ffffffffa002d0dd>] usb_control_msg+0xed/0x240 [usbcore] [<ffffffff81430d77>] ? __mutex_lock_common+0x387/0x4e0 [<ffffffffa06064ab>] dib0700_identify_state+0x4b/0xa0 [dvb_usb_dib0700] [<ffffffff814327e5>] ? _raw_spin_lock_irqsave+0x25/0x90 [<ffffffffa0579892>] dvb_usb_device_init+0x142/0x730 [dvb_usb] [<ffffffffa0607738>] dib0700_probe+0x68/0xf0 [dvb_usb_dib0700] [<ffffffffa0030194>] usb_probe_interface+0x114/0x1d0 [usbcore] [<ffffffff813156e6>] driver_probe_device+0x96/0x1a0 [<ffffffff8131589b>] __driver_attach+0xab/0xb0 [<ffffffff813157f0>] ? __driver_attach+0x0/0xb0 [<ffffffff81314afc>] bus_for_each_dev+0x6c/0xa0 [<ffffffff8131552e>] driver_attach+0x1e/0x20 [<ffffffff81314de1>] bus_add_driver+0xe1/0x280 [<ffffffff81315be4>] driver_register+0x74/0x130 [<ffffffffa002fe2c>] usb_register_driver+0xdc/0x1a0 [usbcore] [<ffffffffa0557000>] ? dib0700_module_init+0x0/0x53 [dvb_usb_dib0700] [<ffffffffa0557037>] dib0700_module_init+0x37/0x53 [dvb_usb_dib0700] [<ffffffff810001dc>] do_one_initcall+0x3c/0x1d0 [<ffffffff81094990>] sys_init_module+0xe0/0x260 [<ffffffff810030db>] system_call_fastpath+0x16/0x1b ---[ end trace c5c0bb86c60e6f6b ]--- dvb-usb: found a 'Hauppauge Nova-TD Stick (52009)' in cold state, will try to load a firmware usb 2-3: firmware: requesting dvb-usb-dib0700-1.20.fw dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.20.fw' Zdenek -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Joerg Roedel on 14 May 2010 07:30
On Fri, May 14, 2010 at 10:56:46AM +0200, Zdenek Kabelac wrote: > I've noticed my dvb-t tuner reports this Warning about stack usage for DMA. > Is there some fix already available ? int dib0700_identify_state(struct usb_device *udev, struct dvb_usb_device_properties *props, struct dvb_usb_device_description **desc, int *cold) { u8 b[16]; s16 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev,0), REQUEST_GET_VERSION, USB_TYPE_VENDOR | USB_DIR_IN, 0, 0, b, 16, USB_CTRL_GET_TIMEOUT); ... } The variable b is on the stack and used as the usb transfer buffer. This should be easy to fix. Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |