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Subject[PATCH v7 01/14] usb: hcd: Initialize hcd->flags to 0
Date
When using the OTG/drd library we can call hcd_add/remove
consecutively without calling usb_put_hcd/usb_create_hcd in between
so hcd->flags can be stale.

If the HC dies due to whatever reason then without this
patch we get the below error on next hcd_add.

[ 91.494257] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
[ 91.502068] hub 3-0:1.0: state 0 ports 1 chg 0000 evt 0000
[ 91.510240] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller
[ 91.516940] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 4
[ 91.529745] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM.
[ 91.540637] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
[ 91.757865] irq 254: nobody cared (try booting with the "irqpoll" option)
[ 91.757880] CPU: 0 PID: 68 Comm: kworker/u2:2 Not tainted 4.1.4-00828-g1f0ed8c-dirty #44
[ 91.757885] Hardware name: Generic AM43 (Flattened Device Tree)
[ 91.757914] Workqueue: usb_otg usb_otg_work
[ 91.757921] Backtrace:
[ 91.757954] [<c0012af0>] (dump_backtrace) from [<c0012c8c>] (show_stack+0x18/0x1c)
[ 91.757972] r6:c089d4a4 r5:ffffffff r4:00000000 r3:ee440000
[ 91.757991] [<c0012c74>] (show_stack) from [<c05f7c14>] (dump_stack+0x84/0xd0)
[ 91.758008] [<c05f7b90>] (dump_stack) from [<c0084b30>] (__report_bad_irq+0x28/0xc8)
[ 91.758024] r7:00000000 r6:000000fe r5:00000000 r4:ee514c40
[ 91.758037] [<c0084b08>] (__report_bad_irq) from [<c00850b0>] (note_interrupt+0x24c/0x2ac)
[ 91.758052] r6:000000fe r5:00000000 r4:ee514c40 r3:00000000
[ 91.758065] [<c0084e64>] (note_interrupt) from [<c00828fc>] (handle_irq_event_percpu+0xb0/0x158)
[ 91.758085] r10:ee514c40 r9:c08ce49a r8:000000fe r7:00000000 r6:00000000 r5:00000000
[ 91.758094] r4:00000000 r3:00000000
[ 91.758105] [<c008284c>] (handle_irq_event_percpu) from [<c00829e8>] (handle_irq_event+0x44/0x64)
[ 91.758126] r10:00000001 r9:ee441ab0 r8:ee441bb8 r7:c0858b4c r6:ed174280 r5:ee514ca0
[ 91.758132] r4:ee514c40
[ 91.758144] [<c00829a4>] (handle_irq_event) from [<c0085970>] (handle_fasteoi_irq+0x100/0x1bc)
[ 91.758159] r6:c085dba0 r5:ee514ca0 r4:ee514c40 r3:00000000
[ 91.758171] [<c0085870>] (handle_fasteoi_irq) from [<c0082058>] (generic_handle_irq+0x28/0x38)
[ 91.758186] r7:c0853d40 r6:c0858b4c r5:000000fe r4:000000fe
[ 91.758197] [<c0082030>] (generic_handle_irq) from [<c00821c0>] (__handle_domain_irq+0x98/0x12c)
[ 91.758207] r4:c0853d40 r3:00000100
[ 91.758219] [<c0082128>] (__handle_domain_irq) from [<c00094e0>] (gic_handle_irq+0x28/0x68)
[ 91.758239] r10:00000001 r9:ee441bb8 r8:fa240100 r7:c0858d70 r6:ee441ab0 r5:000000b8
[ 91.758245] r4:fa24010c
[ 91.758264] [<c00094b8>] (gic_handle_irq) from [<c05fd540>] (__irq_svc+0x40/0x74)
[ 91.758271] Exception stack(0xee441ab0 to 0xee441af8)
[ 91.758280] 1aa0: 00000000 c08d2980 ee441ac0 00000000
[ 91.758292] 1ac0: 00000008 00000089 c0858b4c c0858080 00000000 ee441bb8 00000001 ee441b3c
[ 91.758301] 1ae0: 00000101 ee441af8 c02fc418 c0046a1c 20000113 ffffffff
[ 91.758321] r8:00000000 r7:ee441ae4 r6:ffffffff r5:20000113 r4:c0046a1c r3:c02fc418
[ 91.758347] [<c00469a0>] (__do_softirq) from [<c0046eac>] (irq_exit+0xb8/0x104)
[ 91.758367] r10:00000001 r9:ee441bb8 r8:00000000 r7:c0853d40 r6:c0858b4c r5:00000089
[ 91.758373] r4:00000000
[ 91.758386] [<c0046df4>] (irq_exit) from [<c00821c8>] (__handle_domain_irq+0xa0/0x12c)
[ 91.758395] r4:00000000 r3:00000100
[ 91.758406] [<c0082128>] (__handle_domain_irq) from [<c00094e0>] (gic_handle_irq+0x28/0x68)
[ 91.758426] r10:c08e3510 r9:20000013 r8:fa240100 r7:c0858d70 r6:ee441bb8 r5:00000039
[ 91.758433] r4:fa24010c
[ 91.758445] [<c00094b8>] (gic_handle_irq) from [<c05fd540>] (__irq_svc+0x40/0x74)
[ 91.758450] Exception stack(0xee441bb8 to 0xee441c00)
[ 91.758457] 1ba0: 00000000 00000001
[ 91.758468] 1bc0: 00000000 ee440000 c08e2524 0000004d 00000274 00000000 00000000 20000013
[ 91.758479] 1be0: c08e3510 ee441c4c ee441b60 ee441c00 c03acfec c0080d4c 60000013 ffffffff
[ 91.758499] r8:00000000 r7:ee441bec r6:ffffffff r5:60000013 r4:c0080d4c r3:c03acfec
[ 91.758524] [<c0080950>] (console_unlock) from [<c0081670>] (vprintk_emit+0x20c/0x500)
[ 91.758544] r10:ee441cc0 r9:c08d3550 r8:c08e3ea0 r7:00000000 r6:00000001 r5:0000003d
[ 91.758551] r4:c08d3550
[ 91.758573] [<c0081464>] (vprintk_emit) from [<c03f6f70>] (dev_vprintk_emit+0x104/0x1ac)
[ 91.758593] r10:ee441d8c r9:0000000e r8:c07951e0 r7:00000006 r6:ee441cc0 r5:0000000d
[ 91.758599] r4:ee731068
[ 91.758612] [<c03f6e6c>] (dev_vprintk_emit) from [<c03f7040>] (dev_printk_emit+0x28/0x30)
[ 91.758632] r10:00000001 r9:ee5f8410 r8:ee731000 r7:ed429000 r6:00000006 r5:ee441dc0
[ 91.758638] r4:ee731068
[ 91.758651] [<c03f701c>] (dev_printk_emit) from [<c03f7098>] (__dev_printk+0x50/0x70)
[ 91.758660] r3:bf2268cc r2:c07951e0
[ 91.758673] [<c03f7048>] (__dev_printk) from [<c03f70f4>] (_dev_info+0x3c/0x48)
[ 91.758686] r6:00000000 r5:ee731068 r4:ee731000
[ 91.758790] [<c03f70bc>] (_dev_info) from [<bf20ec3c>] (usb_new_device+0x11c/0x518 [usbcore])
[ 91.758804] r3:00000003 r2:00001d6b r1:bf225bc4
[ 91.758881] [<bf20eb20>] (usb_new_device [usbcore]) from [<bf213560>] (usb_otg_add_hcd+0x514/0x7f8 [usbcore])
[ 91.758903] r10:00000001 r9:ee5f8410 r8:ee731000 r7:000000fe r6:ed4290c8 r5:00000000
[ 91.758909] r4:ed429000
[ 91.758957] [<bf21304c>] (usb_otg_add_hcd [usbcore]) from [<c047a238>] (usb_otg_start_host+0xb8/0xf8)
[ 91.758978] r10:00000000 r9:00000002 r8:00000000 r7:ee02b000 r6:ee452808 r5:ee452808
[ 91.758985] r4:ee452808
[ 91.758997] [<c047a180>] (usb_otg_start_host) from [<c047a020>] (drd_set_protocol+0xac/0xd8)
[ 91.759007] r4:00000001 r3:c047a180
[ 91.759018] [<c0479f74>] (drd_set_protocol) from [<c047a2ec>] (drd_set_state+0x74/0x98)
[ 91.759027] r5:ee452808 r4:00000009
[ 91.759039] [<c047a278>] (drd_set_state) from [<c047a3dc>] (usb_otg_work+0xcc/0x154)
[ 91.759054] r6:ee452808 r5:ee4528b8 r4:ee452968 r3:00000000
[ 91.759072] [<c047a310>] (usb_otg_work) from [<c005754c>] (process_one_work+0x128/0x340)
[ 91.759087] r6:ee02ac00 r5:ee452968 r4:ee42b900 r3:c047a310
[ 91.759100] [<c0057424>] (process_one_work) from [<c00578f8>] (worker_thread+0x158/0x49c)
[ 91.759120] r10:ee42b900 r9:00000002 r8:ee02ac00 r7:00000088 r6:ee42b918 r5:ee02ac00
[ 91.759127] r4:ee02ac14
[ 91.759145] [<c00577a0>] (worker_thread) from [<c005cc40>] (kthread+0xdc/0xf8)
[ 91.759165] r10:00000000 r9:00000000 r8:00000000 r7:c00577a0 r6:ee42b900 r5:ee429940
[ 91.759174] r4:00000000 r3:00000000
[ 91.759190] [<c005cb64>] (kthread) from [<c000fc08>] (ret_from_fork+0x14/0x2c)
[ 91.759206] r7:00000000 r6:00000000 r5:c005cb64 r4:ee429940
[ 91.759209] handlers:
[ 91.759255] [<bf211b5c>] usb_hcd_irq [usbcore]
[ 91.759260] Disabling IRQ #254

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
drivers/usb/core/hcd.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 2ca2cef..9484539 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -3009,6 +3009,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
}

usb_put_invalidate_rhdev(hcd);
+ hcd->flags = 0;
}
EXPORT_SYMBOL_GPL(usb_remove_hcd);

--
2.7.4
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