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Date: Thu, 21 Mar 2013 19:45:23 -0700 From: Frank Rowand <frank.rowand@...sony.com> To: Alan Stern <stern@...land.harvard.edu> CC: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>, "balbi@...com" <balbi@...com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [BUG] bisected: PandaBoard smsc95xx ethernet driver error from USB timeout On 03/21/13 07:41, Alan Stern wrote: > On Wed, 20 Mar 2013, Frank Rowand wrote: > >> Hi All, >> >> Not quite sure quite where the problem is (USB, OMAP, smsc95xx driver, other???), >> so casting the nets wide... >> >> The PandaBoard frequently fails to boot with an eth0 error when mounting >> the root file system via NFS (ethernet driver fails due to a USB timeout; >> no ethernet means NFS won't work). A typical set of error messages is: >> >> [ 3.264373] smsc95xx 1-1.1:1.0: usb_probe_interface >> [ 3.269500] smsc95xx 1-1.1:1.0: usb_probe_interface - got id >> [ 3.275543] smsc95xx v1.0.4 >> [ 8.078674] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, 82:b9:1d:fa:67:0d >> [ 8.091003] hub 1-1:1.0: state 7 ports 5 chg 0000 evt 0002 >> [ 13.509918] usb 1-1.1: swapper/0 timed out on ep0out len=0/4 >> [ 13.515869] smsc95xx 1-1.1:1.0: eth0: Failed to write register index 0x00000108 >> [ 13.523559] smsc95xx 1-1.1:1.0: eth0: Failed to write ADDRL: -110 >> [ 13.529998] IP-Config: Failed to open eth0 >> >> I have bisected this to: >> >> commit 18aafe64d75d0e27dae206cacf4171e4e485d285 >> Author: Alan Stern <stern@...land.harvard.edu> >> Date: Wed Jul 11 11:23:04 2012 -0400 >> >> USB: EHCI: use hrtimer for the I/O watchdog > > I don't understand how that commit could cause a timeout unless there > are at least two other bugs present in your system. > >> Note that to compile this version of the kernel, an additional fix must >> also be applied: >> >> commit ba5952e0711b14d8d4fe172671f8aa6091ace3ee >> Author: Ming Lei <ming.lei@...onical.com> >> Date: Fri Jul 13 17:25:24 2012 +0800 >> >> USB: ehci-omap: fix compile failure(v1) >> >> The symptom can be worked around by retrying the USB access if a timeout >> occurs. This is clearly _not_ the fix, just a hack that I used to >> investigate the problem: >> >> http://article.gmane.org/gmane.linux.rt.user/9773 >> >> My kernel configuration is: >> >> arch/arm/configs/omap2plus_defconfig >> >> plus to get the ethernet driver I add: >> >> CONFIG_USB_EHCI_HCD >> CONFIG_USB_NET_SMSC95XX >> >> I found the problem on 3.6.11, but have not replicated it on 3.9-rcX >> yet because my config fails to build on 3.9-rc1 and 3.9-rc2. I'll try >> to work on that issue tomorrow. > > Let me know how it works out. My PandaBoard builds fail on 3.9-rcX due to ARM multiplatform issues. Either there is something I need to change about the way I build it, or it is broken (that is a side issue). My simple expedient was to hack around multiplatform, and just make it build (patch below if anyone else wants a _temporary_ hack). The problem appears to not be present in 3.9-rc3. In older kernel versions, the worst case to see the problem was 18 boots. For 3.9-rc3 I booted 42 times without seeing the problem. The problem occurs at least up through 3.8. I'll try to reverse bisect between 3.8 and 3.9-rc3 to see when the problem disappeared (I'm running short of time, so no promises for a near term result). -Frank This patch is a _temporary_ hack, not fit for man or beast. Avert your eyes, do not apply to any respectable repository! --- arch/arm/Kconfig | 2 1 + 1 - 0 ! arch/arm/Makefile | 2 2 + 0 - 0 ! 2 files changed, 3 insertions(+), 1 deletion(-) Index: b/arch/arm/Kconfig =================================================================== --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1013,7 +1013,7 @@ config ARCH_MULTI_V7 bool "ARMv7 based platforms (Cortex-A, PJ4, Krait)" default y select ARCH_MULTI_V6_V7 - select ARCH_VEXPRESS + select ARCH_VEXPRESS if !ARCH_OMAP2PLUS select CPU_V7 config ARCH_MULTI_V6_V7 Index: b/arch/arm/Makefile =================================================================== --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -227,8 +227,10 @@ else MACHINE := endif ifeq ($(CONFIG_ARCH_MULTIPLATFORM),y) +ifneq ($(CONFIG_ARCH_OMAP2PLUS),y) MACHINE := endif +endif machdirs := $(patsubst %,arch/arm/mach-%/,$(machine-y)) platdirs := $(patsubst %,arch/arm/plat-%/,$(plat-y)) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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