[PATCH] usb: musb: Fix external abort on non-linefetch

[PATCH] usb: musb: Fix external abort on non-linefetch

[Saurav Girepunje]

While accessing the usb mode/vbus from sysfs. Below error came on kernel
version 4.19.

On latest kernel vserion api name changed. Therefore API
name and backtrace API names are different.

     [  821.908066] Backtrace:
     [  821.910695] [<bf078fc0>] (musb_default_readl [musb_hdrc]) from [<bf0af738>] (dsps_musb_set_mode+0x38/0x12c [musb_dsps])
     [  821.922059] [<bf0af700>] (dsps_musb_set_mode [musb_dsps]) from [<bf07899c>] (musb_mode_store+0xc8/0x12c [musb_hdrc])
     [  821.933105]  r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010
     [  821.939096] [<bf0788d4>] (musb_mode_store [musb_hdrc]) from [<c0425184>] (dev_attr_store+0x20/0x2c)
     [  821.948593]  r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4
     [  821.954549] [<c0425164>] (dev_attr_store) from [<c0285b08>] (sysfs_kf_write+0x48/0x4c)
     [  821.962859]  r5:00000000 r4:c0425164
     [  821.966620] [<c0285ac0>] (sysfs_kf_write) from [<c0285274>] (kernfs_fop_write+0xfc/0x1fc)
     [  821.975200]  r5:00000000 r4:cd79d080
     [  821.978966] [<c0285178>] (kernfs_fop_write) from [<c020ec00>] (__vfs_write+0x34/0x120)
     [  821.987280]  r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178
     [  821.995493]  r4:cb67a3c0
     [  821.998160] [<c020ebcc>] (__vfs_write) from [<c020fae8>] (vfs_write+0xa8/0x170)
     [  822.005835]  r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b
     [  822.013969] [<c020fa40>] (vfs_write) from [<c02108d0>] (SyS_write+0x44/0x98)
     [  822.021371]  r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0
     [  822.029517] [<c021088c>] (SyS_write) from [<c010d8a0>] (ret_fast_syscall+0x0/0x3c)
     [  822.037467]  r9:c5aba000 r8:c010daa8 r7:00000004 r6:b6f0ad58 r5:000def80 r4:0000000b
     [  822.045599] Code: e1a0c00d e92dd800 e24cb004 e0801001 (e5910000)

Without pm_runtime_{get,put}_sync calls in place,
Similar issue come on "mode_show" and "vbus_store" also.

fix- call pm_runtime_{get,put}_sync before reading/writing
usb mode/vbus from sysfs.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
---
  drivers/usb/musb/musb_core.c | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 5ebf30b..a1ca8380 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1723,9 +1723,11 @@ int musb_mailbox(enum musb_vbus_id_status status)
  	unsigned long flags;
  	int ret;
  
+	pm_runtime_get_sync(dev);
  	spin_lock_irqsave(&musb->lock, flags);
  	ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
  	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
  
  	return ret;
  }
@@ -1738,6 +1740,7 @@ int musb_mailbox(enum musb_vbus_id_status status)
  	unsigned long	flags;
  	int		status;
  
+	pm_runtime_get_sync(dev);
  	spin_lock_irqsave(&musb->lock, flags);
  	if (sysfs_streq(buf, "host"))
  		status = musb_platform_set_mode(musb, MUSB_HOST);
@@ -1748,6 +1751,7 @@ int musb_mailbox(enum musb_vbus_id_status status)
  	else
  		status = -EINVAL;
  	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
  
  	return (status == 0) ? n : status;
  }
@@ -1766,6 +1770,7 @@ int musb_mailbox(enum musb_vbus_id_status status)
  		return -EINVAL;
  	}
  
+	pm_runtime_get_sync(dev);
  	spin_lock_irqsave(&musb->lock, flags);
  	/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
  	musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
@@ -1773,6 +1778,7 @@ int musb_mailbox(enum musb_vbus_id_status status)
  		musb->is_active = 0;
  	musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
  	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
  
  	return n;
  }
-- 
1.9.1

Re: [PATCH] usb: musb: Fix external abort on non-linefetch

[Greg KH]

On Sun, Jan 26, 2020 at 09:41:56PM +0530, Saurav Girepunje wrote:
> While accessing the usb mode/vbus from sysfs. Below error came on kernel
> version 4.19.
> 
> On latest kernel vserion api name changed. Therefore API
> name and backtrace API names are different.
> 
>     [  821.908066] Backtrace:
>     [  821.910695] [<bf078fc0>] (musb_default_readl [musb_hdrc]) from [<bf0af738>] (dsps_musb_set_mode+0x38/0x12c [musb_dsps])
>     [  821.922059] [<bf0af700>] (dsps_musb_set_mode [musb_dsps]) from [<bf07899c>] (musb_mode_store+0xc8/0x12c [musb_hdrc])
>     [  821.933105]  r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010
>     [  821.939096] [<bf0788d4>] (musb_mode_store [musb_hdrc]) from [<c0425184>] (dev_attr_store+0x20/0x2c)
>     [  821.948593]  r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4
>     [  821.954549] [<c0425164>] (dev_attr_store) from [<c0285b08>] (sysfs_kf_write+0x48/0x4c)
>     [  821.962859]  r5:00000000 r4:c0425164
>     [  821.966620] [<c0285ac0>] (sysfs_kf_write) from [<c0285274>] (kernfs_fop_write+0xfc/0x1fc)
>     [  821.975200]  r5:00000000 r4:cd79d080
>     [  821.978966] [<c0285178>] (kernfs_fop_write) from [<c020ec00>] (__vfs_write+0x34/0x120)
>     [  821.987280]  r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178
>     [  821.995493]  r4:cb67a3c0
>     [  821.998160] [<c020ebcc>] (__vfs_write) from [<c020fae8>] (vfs_write+0xa8/0x170)
>     [  822.005835]  r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b
>     [  822.013969] [<c020fa40>] (vfs_write) from [<c02108d0>] (SyS_write+0x44/0x98)
>     [  822.021371]  r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0
>     [  822.029517] [<c021088c>] (SyS_write) from [<c010d8a0>] (ret_fast_syscall+0x0/0x3c)
>     [  822.037467]  r9:c5aba000 r8:c010daa8 r7:00000004 r6:b6f0ad58 r5:000def80 r4:0000000b
>     [  822.045599] Code: e1a0c00d e92dd800 e24cb004 e0801001 (e5910000)
> 
> Without pm_runtime_{get,put}_sync calls in place,
> Similar issue come on "mode_show" and "vbus_store" also.
> 
> fix- call pm_runtime_{get,put}_sync before reading/writing
> usb mode/vbus from sysfs.
> 
> Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
> ---
>  drivers/usb/musb/musb_core.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 5ebf30b..a1ca8380 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -1723,9 +1723,11 @@ int musb_mailbox(enum musb_vbus_id_status status)
>  	unsigned long flags;
>  	int ret;
> +	pm_runtime_get_sync(dev);
>  	spin_lock_irqsave(&musb->lock, flags);
>  	ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
>  	spin_unlock_irqrestore(&musb->lock, flags);
> +	pm_runtime_put_sync(dev);
>  	return ret;
>  }

<snip>

Always run checkpatch.pl on patches so that you do not get grumpy
maintainers telling you to run checkpatch.pl on your patch :(

(hint, you need a new line after the variable definitions...)

greg k-h

Re: [PATCH] usb: musb: Fix external abort on non-linefetch

[Bin Liu]

Hi,

On Sun, Oct 27, 2019 at 02:06:21PM +0530, Saurav Girepunje wrote:
> While setting the usb mode from sysfs. Below error came on kernel
> version 4.19.
> 
> On latest kernel vserion api name changed. Therefore API
> name and backtrace API name are different.
> 
>     [  821.908066] Backtrace:
>     [  821.910695] [<bf078fc0>] (musb_default_readl [musb_hdrc]) from [<bf0af738>] (dsps_musb_set_mode+0x38/0x12c [musb_dsps])
>     [  821.922059] [<bf0af700>] (dsps_musb_set_mode [musb_dsps]) from [<bf07899c>] (musb_mode_store+0xc8/0x12c [musb_hdrc])
>     [  821.933105]  r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010
>     [  821.939096] [<bf0788d4>] (musb_mode_store [musb_hdrc]) from [<c0425184>] (dev_attr_store+0x20/0x2c)
>     [  821.948593]  r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4
>     [  821.954549] [<c0425164>] (dev_attr_store) from [<c0285b08>] (sysfs_kf_write+0x48/0x4c)
>     [  821.962859]  r5:00000000 r4:c0425164
>     [  821.966620] [<c0285ac0>] (sysfs_kf_write) from [<c0285274>] (kernfs_fop_write+0xfc/0x1fc)
>     [  821.975200]  r5:00000000 r4:cd79d080
>     [  821.978966] [<c0285178>] (kernfs_fop_write) from [<c020ec00>] (__vfs_write+0x34/0x120)
>     [  821.987280]  r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178
>     [  821.995493]  r4:cb67a3c0
>     [  821.998160] [<c020ebcc>] (__vfs_write) from [<c020fae8>] (vfs_write+0xa8/0x170)
>     [  822.005835]  r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b
>     [  822.013969] [<c020fa40>] (vfs_write) from [<c02108d0>] (SyS_write+0x44/0x98)
>     [  822.021371]  r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0
>     [  822.029517] [<c021088c>] (SyS_write) from [<c010d8a0>] (ret_fast_syscall+0x0/0x3c)
>     [  822.037467]  r9:c5aba000 r8:c010daa8 r7:00000004 r6:b6f0ad58 r5:000def80 r4:0000000b
>     [  822.045599] Code: e1a0c00d e92dd800 e24cb004 e0801001 (e5910000)
> 
>     Without pm_runtime_{get,put}_sync calls in place,
>     Similar issue come on "mode_show" and "vbus_store" also.

Do you really get the kernel dump on mode_show() and vbus_store()? It
shouldn't because the two functions don't access musb registers. What
platform have you tested on?

> 
>     fix- call pm_runtime_{get,put}_sync before reading/writing
>     usb mode/vbus from sysfs.
> 
>     As sugguested on commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'

This seems to be your private commit id. You don't have to refer to it,
including the quote below.

>     Merged all the fix which reslove same bug in the same file.
>     "
>       commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'
>       Author: Saurav Girepunje <saurav.girepunje@gmail.com>
>       Date:   Thu Aug 8 00:05:03 2019 +0530
> 
>       usb: musb: Fix external abort on non-linefetch for vbus_store
> 
>       Without pm_runtime_{get,put}_sync calls in place, writing
>       vbus value via /sys causes the error
> 
>       "Unhandled fault external abort on non-linefetch"
> 
>         On Thu, Aug 08, 2019 at 12:11:46AM +0530, Saurav Girepunje wrote:
> 	> Without pm_runtime_{get,put}_sync calls in place, writing
> 	> vbus value via /sys causes the error
> 	>
> 	> "Unhandled fault external abort on non-linefetch"
> 	>
> 	> Signed-off-by: Saurav Girepunje <saurav.girepunje@xxxxxxxxx>
> 
> 	Thanks for the patch. Can you please merge another two similar patches
> 	you just sent with this one? They all fix the same bug in the same file
> 	so could be just in one patch.
> 
> 	-Bin.
>     "
> 
> Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>

-Bin.

Re: [PATCH] usb: musb: Fix external abort on non-linefetch

[Bin Liu]

Hi Saurav,

On Sun, Jan 19, 2020 at 11:34:04AM +0530, SAURAV GIREPUNJE wrote:
> Hi Bin,
> 
> Yes, I really got this kernel dump for mode_show() and vbus_store(),
> While accessing show/store for mode and vbus through sysfs .

Please provide the kernel dump for mode_show() and vbus_store(). The log
below is for mode_store().

> I have submitted earlier also three patches for same bug, In reply to
> one of those patches you
> asked me to merge another two patches and just sent in one.

I don't have issue to merge all the fixes into one patch, since they fix
the same bug. But I need the dump log to see how the dump is triggered
in mode_show() and vbus_store() as I don't see the how it could happen
and I cannot reproduce it. These two function do not access any musb
register.

By the way, please don't top-posting, and reply to my message to
preserve the context.

-Bin.

> 
> Regards,
> Saurav Girepunje
> 
> On 27/10/19 14:06 +0530, Saurav Girepunje wrote:
> > While setting the usb mode from sysfs. Below error came on kernel
> > version 4.19.
> > 
> > On latest kernel vserion api name changed. Therefore API
> > name and backtrace API name are different.
> > 
> >    [  821.908066] Backtrace:
> >    [  821.910695] [<bf078fc0>] (musb_default_readl [musb_hdrc]) from [<bf0af738>] (dsps_musb_set_mode+0x38/0x12c [musb_dsps])
> >    [  821.922059] [<bf0af700>] (dsps_musb_set_mode [musb_dsps]) from [<bf07899c>] (musb_mode_store+0xc8/0x12c [musb_hdrc])
> >    [  821.933105]  r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010
> >    [  821.939096] [<bf0788d4>] (musb_mode_store [musb_hdrc]) from [<c0425184>] (dev_attr_store+0x20/0x2c)
> >    [  821.948593]  r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4
> >    [  821.954549] [<c0425164>] (dev_attr_store) from [<c0285b08>] (sysfs_kf_write+0x48/0x4c)
> >    [  821.962859]  r5:00000000 r4:c0425164
> >    [  821.966620] [<c0285ac0>] (sysfs_kf_write) from [<c0285274>] (kernfs_fop_write+0xfc/0x1fc)
> >    [  821.975200]  r5:00000000 r4:cd79d080
> >    [  821.978966] [<c0285178>] (kernfs_fop_write) from [<c020ec00>] (__vfs_write+0x34/0x120)
> >    [  821.987280]  r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178
> >    [  821.995493]  r4:cb67a3c0
> >    [  821.998160] [<c020ebcc>] (__vfs_write) from [<c020fae8>] (vfs_write+0xa8/0x170)
> >    [  822.005835]  r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b
> >    [  822.013969] [<c020fa40>] (vfs_write) from [<c02108d0>] (SyS_write+0x44/0x98)
> >    [  822.021371]  r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0
> >    [  822.029517] [<c021088c>] (SyS_write) from [<c010d8a0>] (ret_fast_syscall+0x0/0x3c)
> >    [  822.037467]  r9:c5aba000 r8:c010daa8 r7:00000004 r6:b6f0ad58 r5:000def80 r4:0000000b
> >    [  822.045599] Code: e1a0c00d e92dd800 e24cb004 e0801001 (e5910000)
> > 
> >    Without pm_runtime_{get,put}_sync calls in place,
> >    Similar issue come on "mode_show" and "vbus_store" also.
> > 
> >    fix- call pm_runtime_{get,put}_sync before reading/writing
> >    usb mode/vbus from sysfs.
> > 
> >    As sugguested on commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'
> >    Merged all the fix which reslove same bug in the same file.
> >    "
> >      commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'
> >      Author: Saurav Girepunje <saurav.girepunje@gmail.com>
> >      Date:   Thu Aug 8 00:05:03 2019 +0530
> > 
> >      usb: musb: Fix external abort on non-linefetch for vbus_store
> > 
> >      Without pm_runtime_{get,put}_sync calls in place, writing
> >      vbus value via /sys causes the error
> > 
> >      "Unhandled fault external abort on non-linefetch"
> > 
> >        On Thu, Aug 08, 2019 at 12:11:46AM +0530, Saurav Girepunje wrote:
> > 	> Without pm_runtime_{get,put}_sync calls in place, writing
> > 	> vbus value via /sys causes the error
> > 	>
> > 	> "Unhandled fault external abort on non-linefetch"
> > 	>
> > 	> Signed-off-by: Saurav Girepunje <saurav.girepunje@xxxxxxxxx>
> > 
> > 	Thanks for the patch. Can you please merge another two similar patches
> > 	you just sent with this one? They all fix the same bug in the same file
> > 	so could be just in one patch.
> > 
> > 	-Bin.
> >    "
> > 
> > Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
> > ---
> > drivers/usb/musb/musb_core.c | 6 ++++++
> > 1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> > index bd63450af76a..dc7d786feb58 100644
> > --- a/drivers/usb/musb/musb_core.c
> > +++ b/drivers/usb/musb/musb_core.c
> > @@ -1723,9 +1723,11 @@ mode_show(struct device *dev, struct device_attribute *attr, char *buf)
> > 	unsigned long flags;
> > 	int ret;
> > 
> > +	pm_runtime_get_sync(dev);
> > 	spin_lock_irqsave(&musb->lock, flags);
> > 	ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
> > 	spin_unlock_irqrestore(&musb->lock, flags);
> > +	pm_runtime_put_sync(dev);
> > 
> > 	return ret;
> > }
> > @@ -1738,6 +1740,7 @@ mode_store(struct device *dev, struct device_attribute *attr,
> > 	unsigned long	flags;
> > 	int		status;
> > 
> > +	pm_runtime_get_sync(dev);
> > 	spin_lock_irqsave(&musb->lock, flags);
> > 	if (sysfs_streq(buf, "host"))
> > 		status = musb_platform_set_mode(musb, MUSB_HOST);
> > @@ -1748,6 +1751,7 @@ mode_store(struct device *dev, struct device_attribute *attr,
> > 	else
> > 		status = -EINVAL;
> > 	spin_unlock_irqrestore(&musb->lock, flags);
> > +	pm_runtime_put_sync(dev);
> > 
> > 	return (status == 0) ? n : status;
> > }
> > @@ -1766,6 +1770,7 @@ vbus_store(struct device *dev, struct device_attribute *attr,
> > 		return -EINVAL;
> > 	}
> > 
> > +	pm_runtime_get_sync(dev);
> > 	spin_lock_irqsave(&musb->lock, flags);
> > 	/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
> > 	musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
> > @@ -1773,6 +1778,7 @@ vbus_store(struct device *dev, struct device_attribute *attr,
> > 		musb->is_active = 0;
> > 	musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
> > 	spin_unlock_irqrestore(&musb->lock, flags);
> > +	pm_runtime_put_sync(dev);
> > 
> > 	return n;
> > }
> > -- 
> > 2.20.1
> > 

[PATCH] usb: musb: Fix external abort on non-linefetch

[Saurav Girepunje]

While setting the usb mode from sysfs. Below error came on kernel
version 4.19.

On latest kernel vserion api name changed. Therefore API
name and backtrace API name are different.

    [  821.908066] Backtrace:
    [  821.910695] [<bf078fc0>] (musb_default_readl [musb_hdrc]) from [<bf0af738>] (dsps_musb_set_mode+0x38/0x12c [musb_dsps])
    [  821.922059] [<bf0af700>] (dsps_musb_set_mode [musb_dsps]) from [<bf07899c>] (musb_mode_store+0xc8/0x12c [musb_hdrc])
    [  821.933105]  r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010
    [  821.939096] [<bf0788d4>] (musb_mode_store [musb_hdrc]) from [<c0425184>] (dev_attr_store+0x20/0x2c)
    [  821.948593]  r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4
    [  821.954549] [<c0425164>] (dev_attr_store) from [<c0285b08>] (sysfs_kf_write+0x48/0x4c)
    [  821.962859]  r5:00000000 r4:c0425164
    [  821.966620] [<c0285ac0>] (sysfs_kf_write) from [<c0285274>] (kernfs_fop_write+0xfc/0x1fc)
    [  821.975200]  r5:00000000 r4:cd79d080
    [  821.978966] [<c0285178>] (kernfs_fop_write) from [<c020ec00>] (__vfs_write+0x34/0x120)
    [  821.987280]  r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178
    [  821.995493]  r4:cb67a3c0
    [  821.998160] [<c020ebcc>] (__vfs_write) from [<c020fae8>] (vfs_write+0xa8/0x170)
    [  822.005835]  r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b
    [  822.013969] [<c020fa40>] (vfs_write) from [<c02108d0>] (SyS_write+0x44/0x98)
    [  822.021371]  r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0
    [  822.029517] [<c021088c>] (SyS_write) from [<c010d8a0>] (ret_fast_syscall+0x0/0x3c)
    [  822.037467]  r9:c5aba000 r8:c010daa8 r7:00000004 r6:b6f0ad58 r5:000def80 r4:0000000b
    [  822.045599] Code: e1a0c00d e92dd800 e24cb004 e0801001 (e5910000)

    Without pm_runtime_{get,put}_sync calls in place,
    Similar issue come on "mode_show" and "vbus_store" also.

    fix- call pm_runtime_{get,put}_sync before reading/writing
    usb mode/vbus from sysfs.

    As sugguested on commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'
    Merged all the fix which reslove same bug in the same file.
    "
      commit '2d15f69ed5c1c33f283e77ec161578badde33eaf'
      Author: Saurav Girepunje <saurav.girepunje@gmail.com>
      Date:   Thu Aug 8 00:05:03 2019 +0530

      usb: musb: Fix external abort on non-linefetch for vbus_store

      Without pm_runtime_{get,put}_sync calls in place, writing
      vbus value via /sys causes the error

      "Unhandled fault external abort on non-linefetch"

        On Thu, Aug 08, 2019 at 12:11:46AM +0530, Saurav Girepunje wrote:
	> Without pm_runtime_{get,put}_sync calls in place, writing
	> vbus value via /sys causes the error
	>
	> "Unhandled fault external abort on non-linefetch"
	>
	> Signed-off-by: Saurav Girepunje <saurav.girepunje@xxxxxxxxx>

	Thanks for the patch. Can you please merge another two similar patches
	you just sent with this one? They all fix the same bug in the same file
	so could be just in one patch.

	-Bin.
    "

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
---
 drivers/usb/musb/musb_core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index bd63450af76a..dc7d786feb58 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1723,9 +1723,11 @@ mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 	unsigned long flags;
 	int ret;
 
+	pm_runtime_get_sync(dev);
 	spin_lock_irqsave(&musb->lock, flags);
 	ret = sprintf(buf, "%s\n", usb_otg_state_string(musb->xceiv->otg->state));
 	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
 
 	return ret;
 }
@@ -1738,6 +1740,7 @@ mode_store(struct device *dev, struct device_attribute *attr,
 	unsigned long	flags;
 	int		status;
 
+	pm_runtime_get_sync(dev);
 	spin_lock_irqsave(&musb->lock, flags);
 	if (sysfs_streq(buf, "host"))
 		status = musb_platform_set_mode(musb, MUSB_HOST);
@@ -1748,6 +1751,7 @@ mode_store(struct device *dev, struct device_attribute *attr,
 	else
 		status = -EINVAL;
 	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
 
 	return (status == 0) ? n : status;
 }
@@ -1766,6 +1770,7 @@ vbus_store(struct device *dev, struct device_attribute *attr,
 		return -EINVAL;
 	}
 
+	pm_runtime_get_sync(dev);
 	spin_lock_irqsave(&musb->lock, flags);
 	/* force T(a_wait_bcon) to be zero/unlimited *OR* valid */
 	musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ;
@@ -1773,6 +1778,7 @@ vbus_store(struct device *dev, struct device_attribute *attr,
 		musb->is_active = 0;
 	musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val));
 	spin_unlock_irqrestore(&musb->lock, flags);
+	pm_runtime_put_sync(dev);
 
 	return n;
 }
-- 
2.20.1