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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] [] (musb_default_readl [musb_hdrc]) from [] (dsps_musb_set_mode+0x38/0x12c [musb_dsps]) [ 821.922059] [] (dsps_musb_set_mode [musb_dsps]) from [] (musb_mode_store+0xc8/0x12c [musb_hdrc]) [ 821.933105] r7:a0010013 r6:0000000b r5:cd79d200 r4:cb634010 [ 821.939096] [] (musb_mode_store [musb_hdrc]) from [] (dev_attr_store+0x20/0x2c) [ 821.948593] r7:cd79d200 r6:c5abbf78 r5:00000000 r4:bf0788d4 [ 821.954549] [] (dev_attr_store) from [] (sysfs_kf_write+0x48/0x4c) [ 821.962859] r5:00000000 r4:c0425164 [ 821.966620] [] (sysfs_kf_write) from [] (kernfs_fop_write+0xfc/0x1fc) [ 821.975200] r5:00000000 r4:cd79d080 [ 821.978966] [] (kernfs_fop_write) from [] (__vfs_write+0x34/0x120) [ 821.987280] r10:00000000 r9:0000000b r8:00000000 r7:0000000b r6:c5abbf78 r5:c0285178 [ 821.995493] r4:cb67a3c0 [ 821.998160] [] (__vfs_write) from [] (vfs_write+0xa8/0x170) [ 822.005835] r9:0000000b r8:00000000 r7:c5abbf78 r6:000def80 r5:cb67a3c0 r4:0000000b [ 822.013969] [] (vfs_write) from [] (SyS_write+0x44/0x98) [ 822.021371] r9:0000000b r8:000def80 r7:00000000 r6:00000000 r5:cb67a3c0 r4:cb67a3c0 [ 822.029517] [] (SyS_write) from [] (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 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 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 --- 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