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From w.sang@pengutronix.de Wed Jun 16 13:24:59 2010
From: Wolfram Sang <w.sang@pengutronix.de>
Date: Tue, 15 Jun 2010 12:34:23 +0200
Subject: USB: ehci-mxc: bail out on transceiver problems
To: linux-usb@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org, Wolfram Sang <w.sang@pengutronix.de>, Sascha Hauer <s.hauer@pengutronix.de>, Daniel Mack <daniel@caiaq.de>, Greg KH <gregkh@suse.de>, stable@kernel.org
Message-ID: <1276598063-3956-2-git-send-email-w.sang@pengutronix.de>
The old code registered the hcd even if there were no transceivers
detected, leading to oopses like this if we try to probe a non-existant
ULPI:
[ 2.730000] mxc-ehci mxc-ehci.0: unable to init transceiver
[ 2.740000] timeout polling for ULPI device
[ 2.740000] timeout polling for ULPI device
[ 2.750000] mxc-ehci mxc-ehci.0: unable to enable vbus on transceiver
[ 2.750000] mxc-ehci mxc-ehci.0: Freescale On-Chip EHCI Host Controller
[ 2.760000] mxc-ehci mxc-ehci.0: new USB bus registered, assigned bus number 2
[ 2.770000] Unhandled fault: external abort on non-linefetch (0x808) at 0xc4876184
[ 2.770000] Internal error: : 808 [#1] PREEMPT
[ 2.770000] last sysfs file:
[ 2.770000] Modules linked in:
[ 2.770000] CPU: 0 Not tainted (2.6.33.5 #5)
[ 2.770000] PC is at ehci_hub_control+0x4d4/0x8f8
[ 2.770000] LR is at ehci_mxc_setup+0xbc/0xdc
[ 2.770000] pc : [<c0196dfc>] lr : [<c019bc8c>] psr: 00000093
[ 2.770000] sp : c3815e40 ip : 00000001 fp : 60000013
[ 2.770000] r10: c4876184 r9 : 00000000 r8 : c3814000
[ 2.770000] r7 : c391d2cc r6 : 00000001 r5 : 00000001 r4 : 00000000
[ 2.770000] r3 : 80000000 r2 : 00000007 r1 : 80000000 r0 : c4876184
[ 2.770000] Flags: nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 2.770000] Control: 0005317f Table: a0004000 DAC: 00000017
[ 2.770000] Process swapper (pid: 1, stack limit = 0xc3814270)
...
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: stable <stable@kernel.org>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/host/ehci-mxc.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/ehci-mxc.c
+++ b/drivers/usb/host/ehci-mxc.c
@@ -207,10 +207,17 @@ static int ehci_mxc_drv_probe(struct pla
/* Initialize the transceiver */
if (pdata->otg) {
pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
- if (otg_init(pdata->otg) != 0)
- dev_err(dev, "unable to init transceiver\n");
- else if (otg_set_vbus(pdata->otg, 1) != 0)
+ ret = otg_init(pdata->otg);
+ if (ret) {
+ dev_err(dev, "unable to init transceiver, probably missing\n");
+ ret = -ENODEV;
+ goto err_add;
+ }
+ ret = otg_set_vbus(pdata->otg, 1);
+ if (ret) {
dev_err(dev, "unable to enable vbus on transceiver\n");
+ goto err_add;
+ }
}
priv->hcd = hcd;
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