[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[Merlijn Wajer]

Without pm_runtime_{get,put}_sync calls in place, reading
vbus status via /sys causes the following error:

Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060
pgd = b333e822
[fa0ab060] *pgd=48011452(bad)

[<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4)
[<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44)
[<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc)
[<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448)
[<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118)
[<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144)
[<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74)
[<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54)

Solution was suggested by Tony Lindgren <tony@atomide.com>.

Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
---
 drivers/usb/musb/musb_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index eef4ad578b31..c344ef4e5355 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1756,6 +1756,7 @@ vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
 	int		vbus;
 	u8		devctl;
 
+	pm_runtime_get_sync(dev);
 	spin_lock_irqsave(&musb->lock, flags);
 	val = musb->a_wait_bcon;
 	vbus = musb_platform_get_vbus_status(musb);
@@ -1769,6 +1770,7 @@ vbus_show(struct device *dev, struct device_attribute *attr, char *buf)
 			vbus = 0;
 	}
 	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
 
 	return sprintf(buf, "Vbus %s, timeout %lu msec\n",
 			vbus ? "on" : "off", val);

[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[Tony Lindgren]

* Merlijn Wajer <merlijn@wizzup.org> [180227 22:29]:
> Without pm_runtime_{get,put}_sync calls in place, reading
> vbus status via /sys causes the following error:
> 
> Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060
> pgd = b333e822
> [fa0ab060] *pgd=48011452(bad)
> 
> [<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4)
> [<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44)
> [<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc)
> [<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448)
> [<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118)
> [<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144)
> [<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74)
> [<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54)
> 
> Solution was suggested by Tony Lindgren <tony@atomide.com>.
> 
> Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>

Thanks for fixing this. Assuming it passes Bin's tests:

Acked-by: Tony Lindgren <tony@atomide.com>
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[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[Bin Liu]

On Wed, Feb 28, 2018 at 01:59:43PM -0800, Tony Lindgren wrote:
> * Merlijn Wajer <merlijn@wizzup.org> [180227 22:29]:
> > Without pm_runtime_{get,put}_sync calls in place, reading
> > vbus status via /sys causes the following error:
> > 
> > Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060
> > pgd = b333e822
> > [fa0ab060] *pgd=48011452(bad)
> > 
> > [<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4)
> > [<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44)
> > [<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc)
> > [<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448)
> > [<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118)
> > [<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144)
> > [<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74)
> > [<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54)
> > 
> > Solution was suggested by Tony Lindgren <tony@atomide.com>.
> > 
> > Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
> 
> Thanks for fixing this. Assuming it passes Bin's tests:
> 
> Acked-by: Tony Lindgren <tony@atomide.com>

Applied and sent out. Thanks.

-Bin.
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[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[Ivaylo Dimitrov]

Hi,

On  5.03.2018 19:38, Bin Liu wrote:
> On Wed, Feb 28, 2018 at 01:59:43PM -0800, Tony Lindgren wrote:
>> * Merlijn Wajer <merlijn@wizzup.org> [180227 22:29]:
>>> Without pm_runtime_{get,put}_sync calls in place, reading
>>> vbus status via /sys causes the following error:
>>>
>>> Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060
>>> pgd = b333e822
>>> [fa0ab060] *pgd=48011452(bad)
>>>
>>> [<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4)
>>> [<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44)
>>> [<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc)
>>> [<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448)
>>> [<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118)
>>> [<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144)
>>> [<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74)
>>> [<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54)
>>>
>>> Solution was suggested by Tony Lindgren <tony@atomide.com>.
>>>
>>> Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
>>
>> Thanks for fixing this. Assuming it passes Bin's tests:
>>
>> Acked-by: Tony Lindgren <tony@atomide.com>
> 
> Applied and sent out. Thanks.
> 

What about stable kernels? Shouldn't this be fixed there as well?

Ivo
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[v2,1/1] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers

[Bin Liu]

On Mon, Mar 05, 2018 at 08:35:10PM +0200, Ivaylo Dimitrov wrote:
> Hi,
> 
> On  5.03.2018 19:38, Bin Liu wrote:
> >On Wed, Feb 28, 2018 at 01:59:43PM -0800, Tony Lindgren wrote:
> >>* Merlijn Wajer <merlijn@wizzup.org> [180227 22:29]:
> >>>Without pm_runtime_{get,put}_sync calls in place, reading
> >>>vbus status via /sys causes the following error:
> >>>
> >>>Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa0ab060
> >>>pgd = b333e822
> >>>[fa0ab060] *pgd=48011452(bad)
> >>>
> >>>[<c05261b0>] (musb_default_readb) from [<c0525bd0>] (musb_vbus_show+0x58/0xe4)
> >>>[<c0525bd0>] (musb_vbus_show) from [<c04c0148>] (dev_attr_show+0x20/0x44)
> >>>[<c04c0148>] (dev_attr_show) from [<c0259f74>] (sysfs_kf_seq_show+0x80/0xdc)
> >>>[<c0259f74>] (sysfs_kf_seq_show) from [<c0210bac>] (seq_read+0x250/0x448)
> >>>[<c0210bac>] (seq_read) from [<c01edb40>] (__vfs_read+0x1c/0x118)
> >>>[<c01edb40>] (__vfs_read) from [<c01edccc>] (vfs_read+0x90/0x144)
> >>>[<c01edccc>] (vfs_read) from [<c01ee1d0>] (SyS_read+0x3c/0x74)
> >>>[<c01ee1d0>] (SyS_read) from [<c0106fe0>] (ret_fast_syscall+0x0/0x54)
> >>>
> >>>Solution was suggested by Tony Lindgren <tony@atomide.com>.
> >>>
> >>>Signed-off-by: Merlijn Wajer <merlijn@wizzup.org>
> >>
> >>Thanks for fixing this. Assuming it passes Bin's tests:
> >>
> >>Acked-by: Tony Lindgren <tony@atomide.com>
> >
> >Applied and sent out. Thanks.
> >
> 
> What about stable kernels? Shouldn't this be fixed there as well?

Yes, it should, but I need to figure out which stables to send to and I
am busy in something at the moment. So I will send it @stable some time
later.

Regards,
-Bin.
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