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usb: musb: Add missing pm_runtime_disable and drop 2430 PM timeout

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We are missing pm_runtime_disable() in 2430 glue layer. Further,
we only need to enable PM runtime and disable it on exit. With
musb_core.c doing PM, the glue layer as a parent will always be
active when musb_core.c is active.

This fixes host enumeration issues with some devices as reported
by Ladislav Michl <[email protected]>.

And holding an RPM reference while deregistering the child would
lead to a crash in omap2430_runtime_suspend() which dereferences
the now freed child's driver data on put as pointed out by
Johan Hovold <[email protected]>:

Unable to handle kernel paging request at virtual address 6b6b6f17
...
[<c05453d4>] (omap2430_runtime_suspend) from [<c0481410>]
 (pm_generic_runtime_suspend+0x3c/0x48)
[<c0481410>] (pm_generic_runtime_suspend) from [<c0121028>]
 (_od_runtime_suspend+0x1c/0x30)
[<c0121028>] (_od_runtime_suspend) from [<c04833b0>] (__rpm_callback+0x3c/0x70)
[<c04833b0>] (__rpm_callback) from [<c0483414>] (rpm_callback+0x30/0x90)
[<c0483414>] (rpm_callback) from [<c0483984>] (rpm_suspend+0x118/0x6b4)
[<c0483984>] (rpm_suspend) from [<c04840f4>] (rpm_idle+0x104/0x440)
[<c04840f4>] (rpm_idle) from [<c04844ac>] (__pm_runtime_idle+0x7c/0xb0)
[<c04844ac>] (__pm_runtime_idle) from [<c0545458>] (omap2430_remove+0x38/0x58)
[<c0545458>] (omap2430_remove) from [<c047b2bc>] (platform_drv_remove+0x34/0x4c)

Note that if changes are needed to the autosuspend timeout, it should
be done in musb_core.c.

Reported-by: Ladislav Michl <[email protected]>
Fixes: 87326e8584 ("usb: musb: Remove extra PM runtime calls from
2430 glue layer")
Tested-by: Ladislav Michl <[email protected]>
Reviewed-by: Johan Hovold <[email protected]>
Tested-by: Laurent Pinchart <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Bin Liu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Tony Lindgren 2016-11-16 13:21:25 -06:00 • committed by Greg Kroah-Hartman
commit 536d599d4a
1 changed files with 4 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

10
drivers/usb/musb/omap2430.c
View file

@ -513,17 +513,18 @@ static int omap2430_probe(struct platform_device *pdev)
}
pm_runtime_enable(glue->dev);
pm_runtime_use_autosuspend(glue->dev);
pm_runtime_set_autosuspend_delay(glue->dev, 100);
ret = platform_device_add(musb);
if (ret) {
dev_err(&pdev->dev, "failed to register musb device\n");
goto err2;
goto err3;
}
return 0;
err3:
pm_runtime_disable(glue->dev);
err2:
platform_device_put(musb);
@ -535,10 +536,7 @@ static int omap2430_remove(struct platform_device *pdev)
{
struct omap2430_glue *glue = platform_get_drvdata(pdev);
pm_runtime_get_sync(glue->dev);
platform_device_unregister(glue->musb);
pm_runtime_put_sync(glue->dev);
pm_runtime_dont_use_autosuspend(glue->dev);
pm_runtime_disable(glue->dev);
return 0;