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| author | Wolfram Sang <w.sang@pengutronix.de> | 2010-06-15 12:34:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:29:59 -0700 |
| commit | 97d3985f8785d64a98e1bba747feeb1e87cc9a01 (patch) | |
| tree | 4f6b09e4dc95b0b58446019a78d29ad506aa67f3 /drivers | |
| parent | ee56af51036381add98dab548e3f6dea1406bf07 (diff) | |
| download | lwn-97d3985f8785d64a98e1bba747feeb1e87cc9a01.tar.gz lwn-97d3985f8785d64a98e1bba747feeb1e87cc9a01.zip | |
USB: ehci-mxc: bail out on transceiver problems
commit 4c9715de52b9b6256bf1e9510917111a47b0c176 upstream.
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>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/host/ehci-mxc.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c index ead59f42e69b..9ea52299f14a 100644 --- 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 platform_device *pdev) /* 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; |