This patch restore the logic but protects the variable using a spinlock
without moving the code
[ 45.597274] dwc3 31000000.usb: wait for SETUP phase timed out
[ 45.599140] dwc3 31000000.usb: failed to set STALL on ep0out
[ 45.601069] ------------[ cut here ]------------
[ 45.601073] WARNING: CPU: 0 PID: 150 at drivers/usb/dwc3/ep0.c:289 dwc3_ep0_out_start+0xcc/0xd4
[ 45.601102] Modules linked in: cfg80211 rfkill ipv6 rpmsg_ctrl rpmsg_char crct10dif_ce rti_wdt k3_j72xx_bandgap rtc_ti_k3 omap_mailbox sa2ul authenc [last unloaded: ti_k3_r5_remoteproc]
[ 45.601151] CPU: 0 PID: 150 Comm: sh Not tainted 6.8.0-rc5 #1
[ 45.601159] Hardware name: BSH - CCM-M3 (DT)
[ 45.601164] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 45.601172] pc : dwc3_ep0_out_start+0xcc/0xd4
[ 45.601179] lr : dwc3_ep0_out_start+0x50/0xd4
[ 45.601186] sp : ffff8000832739e0
[ 45.601189] x29: ffff8000832739e0 x28: ffff800082a21000 x27: ffff8000808dc630
[ 45.601200] x26: 0000000000000002 x25: ffff800082530a44 x24: 0000000000000000
[ 45.601210] x23: ffff000000e079a0 x22: ffff000000e07a68 x21: 0000000000000001
[ 45.601219] x20: ffff000000e07880 x19: ffff000000e07880 x18: 0000000000000040
[ 45.601229] x17: ffff7fff8e1ce000 x16: ffff800080000000 x15: fffffffffffe5260
[ 45.601239] x14: 0000000000000000 x13: 206e6f204c4c4154 x12: 5320746573206f74
[ 45.601249] x11: 0000000000000001 x10: 000000000000000a x9 : ffff800083273930
[ 45.601259] x8 : 000000000000000a x7 : ffffffffffff3f0c x6 : ffffffffffff3f00
[ 45.601268] x5 : ffffffffffff3f0c x4 : 0000000000000000 x3 : 0000000000000000
[ 45.601278] x2 : 0000000000000000 x1 : ffff000004e7e600 x0 : 00000000ffffff92
[ 45.601289] Call trace:
[ 45.601293] dwc3_ep0_out_start+0xcc/0xd4
[ 45.601301] dwc3_ep0_stall_and_restart+0x98/0xbc
[ 45.601309] dwc3_ep0_reset_state+0x5c/0x88
[ 45.601315] dwc3_gadget_soft_disconnect+0x144/0x160
[ 45.601323] dwc3_gadget_suspend+0x18/0xb0
[ 45.601329] dwc3_suspend_common+0x5c/0x18c
[ 45.601341] dwc3_suspend+0x20/0x44
[ 45.601350] platform_pm_suspend+0x2c/0x6c
[ 45.601360] __device_suspend+0x10c/0x34c
[ 45.601372] dpm_suspend+0x1a8/0x240
[ 45.601382] dpm_suspend_start+0x80/0x9c
[ 45.601391] suspend_devices_and_enter+0x1c4/0x584
[ 45.601402] pm_suspend+0x1b0/0x264
[ 45.601408] state_store+0x80/0xec
[ 45.601415] kobj_attr_store+0x18/0x2c
[ 45.601426] sysfs_kf_write+0x44/0x54
[ 45.601434] kernfs_fop_write_iter+0x120/0x1ec
[ 45.601445] vfs_write+0x23c/0x358
[ 45.601458] ksys_write+0x70/0x104
[ 45.601467] __arm64_sys_write+0x1c/0x28
[ 45.601477] invoke_syscall+0x48/0x114
[ 45.601488] el0_svc_common.constprop.0+0x40/0xe0
[ 45.601498] do_el0_svc+0x1c/0x28
[ 45.601506] el0_svc+0x34/0xb8
[ 45.601516] el0t_64_sync_handler+0x100/0x12c
[ 45.601522] el0t_64_sync+0x190/0x194
[ 45.601531] ---[ end trace 0000000000000000 ]---
[ 45.608794] Disabling non-boot CPUs ...
[ 45.611029] psci: CPU1 killed (polled 0 ms)
[ 45.611837] Enabling non-boot CPUs ...
[ 45.612247] Detected VIPT I-cache on CPU1
Tested on a am62x board
Fixes: 61a348857e86 ("usb: dwc3: gadget: Fix NULL pointer dereference in dwc3_gadget_suspend)
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
---
V1->V2:
Add cc to stable
---
drivers/usb/dwc3/gadget.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4c8dd6724678..4c88e44127b5 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4703,13 +4703,19 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
unsigned long flags;
int ret;
+ spin_lock_irqsave(&dwc->lock, flags);
+ if (!dwc->gadget_driver) {
+ spin_unlock_irqrestore(&dwc->lock, flags);
+ return 0;
+ }
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
ret = dwc3_gadget_soft_disconnect(dwc);
if (ret)
goto err;
spin_lock_irqsave(&dwc->lock, flags);
- if (dwc->gadget_driver)
- dwc3_disconnect_gadget(dwc);
+ dwc3_disconnect_gadget(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return 0;
--
2.40.1
