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authorFupan Li <fupan.li@windriver.com>2015-08-03 14:19:43 +0300
committerFelipe Balbi <balbi@ti.com>2015-08-03 17:49:47 +0300
commita24b071bb4ac37ef51a0ed4765f89be05a617677 (patch)
tree904855797ec0929682c838508471518e2d8bfb18 /drivers
parent2f0bb2a0e7f5161e83615fb1283c5079566ed6a7 (diff)
downloadlinux-a24b071bb4ac37ef51a0ed4765f89be05a617677.tar.xz
usb: gadget: f_printer: fix deadlock caused by nested spinlock
Function printer_func_disable() has called spinlock on printer_dev->lock, and it'll call function chain of printer_reset_interface() | +---dwc3_gadget_ep_disable() | +---__dwc3_gadget_ep_disable() | +---dwc3_remove_requests() | +---dwc3_gadget_giveback() | +---rx_complete() in the protected block. However, rx_complete() in f_printer.c calls spinlock on printer_dev->lock again, which will cause system hang. The following steps can reproduce this hang: 1. Build the test program from Documentation/usb/gadget_printer.txt as g_printer 2. Plug in the USB device to a host(such as Ubuntu). 3. on the USB device system run: #modprobe g_printer.ko #./g_printer -read_data 4. Unplug the USB device from the host The system will hang later. In order to avoid this deadlock, moving the spinlock from printer_func_disable() into printer_reset_interface() and excluding the block of calling dwc3_gadget_ep_disable(), in which the critical resource will be protected by its spinlock in rx_complete(). This commit will fix the system hang with the following calltrace: INFO: rcu_preempt detected stalls on CPUs/tasks: { 3} (detected by 0, t=21006 jiffies, g=524, c=523, q=2) sending NMI to all CPUs: NMI backtrace for cpu 3 CPU: 3 PID: 718 Comm: irq/22-dwc3 Not tainted 3.10.38-ltsi-WR6.0.0.11_standard #2 Hardware name: Intel Corp. VALLEYVIEW B3 PLATFORM/NOTEBOOK, BIOS BYTICRB1.86C.0092.R32.1410021707 10/02/2014 task: f44f4c20 ti: f40f6000 task.ti: f40f6000 EIP: 0060:[<c1824955>] EFLAGS: 00000097 CPU: 3 EIP is at _raw_spin_lock_irqsave+0x35/0x40 EAX: 00000076 EBX: f80fad00 ECX: 00000076 EDX: 00000075 ESI: 00000096 EDI: ffffff94 EBP: f40f7e20 ESP: f40f7e18 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 CR0: 8005003b CR2: b77ac000 CR3: 01c30000 CR4: 001007f0 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 DR6: ffff0ff0 DR7: 00000400 Stack: f474a720 f80fad00 f40f7e3c f80f93cc c135d486 00000000 f474a720 f468fb00 f4bea894 f40f7e54 f7e35f19 ffffff00 f468fb00 f468fb24 00000086 f40f7e64 f7e36577 f468fb00 f4bea810 f40f7e74 f7e365a8 f468fb00 f4bea894 f40f7e9c Call Trace: [<f80f93cc>] rx_complete+0x1c/0xb0 [g_printer] [<c135d486>] ? vsnprintf+0x166/0x390 [<f7e35f19>] dwc3_gadget_giveback+0xc9/0xf0 [dwc3] [<f7e36577>] dwc3_remove_requests+0x57/0x70 [dwc3] [<f7e365a8>] __dwc3_gadget_ep_disable+0x18/0x60 [dwc3] [<f7e366e9>] dwc3_gadget_ep_disable+0x89/0xf0 [dwc3] [<f80f9031>] printer_reset_interface+0x31/0x50 [g_printer] [<f80f9270>] printer_func_disable+0x20/0x30 [g_printer] [<f80e6d8b>] composite_disconnect+0x4b/0x90 [libcomposite] [<f7e39a8b>] dwc3_disconnect_gadget+0x38/0x43 [dwc3] [<f7e39ad4>] dwc3_gadget_disconnect_interrupt+0x3e/0x5a [dwc3] [<f7e373b8>] dwc3_thread_interrupt+0x5c8/0x610 [dwc3] [<c10ac518>] irq_thread_fn+0x18/0x30 [<c10ac800>] irq_thread+0x100/0x130 [<c10ac500>] ? irq_finalize_oneshot.part.29+0xb0/0xb0 [<c10ac650>] ? wake_threads_waitq+0x40/0x40 [<c10ac700>] ? irq_thread_dtor+0xb0/0xb0 [<c1057224>] kthread+0x94/0xa0 [<c182b337>] ret_from_kernel_thread+0x1b/0x28 [<c1057190>] ? kthread_create_on_node+0xc0/0xc0 Signed-off-by: Fupan Li <fupan.li@windriver.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/gadget/function/f_printer.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index 44173df27273..a91c18a585b5 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -804,6 +804,8 @@ done:
static void printer_reset_interface(struct printer_dev *dev)
{
+ unsigned long flags;
+
if (dev->interface < 0)
return;
@@ -815,9 +817,11 @@ static void printer_reset_interface(struct printer_dev *dev)
if (dev->out_ep->desc)
usb_ep_disable(dev->out_ep);
+ spin_lock_irqsave(&dev->lock, flags);
dev->in_ep->desc = NULL;
dev->out_ep->desc = NULL;
dev->interface = -1;
+ spin_unlock_irqrestore(&dev->lock, flags);
}
/* Change our operational Interface. */
@@ -1131,13 +1135,10 @@ static int printer_func_set_alt(struct usb_function *f,
static void printer_func_disable(struct usb_function *f)
{
struct printer_dev *dev = func_to_printer(f);
- unsigned long flags;
DBG(dev, "%s\n", __func__);
- spin_lock_irqsave(&dev->lock, flags);
printer_reset_interface(dev);
- spin_unlock_irqrestore(&dev->lock, flags);
}
static inline struct f_printer_opts