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| author | Vladimir Zapolskiy <vzapolskiy@gmail.com> | 2010-06-29 23:36:26 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-07-26 12:00:58 -0700 |
| commit | 00c05aabf228d220b6189a314d181bad1a09718f (patch) | |
| tree | 82f28c85d5f95710e91b41710cf8aa76aa3c0ea0 /drivers | |
| parent | 83a4eae9aeed4a69e89e323a105e653ae06e7c1f (diff) | |
| download | linux-3.10-00c05aabf228d220b6189a314d181bad1a09718f.tar.gz linux-3.10-00c05aabf228d220b6189a314d181bad1a09718f.tar.bz2 linux-3.10-00c05aabf228d220b6189a314d181bad1a09718f.zip | |
USB: s3c2410_udc: be aware of connected gadget driver
To escape from data abort in interrupt handler, it is required to
check for a connected gadget before delivering control requests.
The change fixes the following panic, which occurs with no loaded
gadget driver and input USB_REQ_GET_DESCRIPTOR request:
Kernel panic - not syncing: Fatal exception in interrupt
[<c0025874>] (unwind_backtrace+0x0/0xd8) from [<c0253f14>] (panic+0x40/0x110)
[<c0253f14>] (panic+0x40/0x110) from [<c002470c>] (die+0x154/0x180)
[<c002470c>] (die+0x154/0x180) from [<c0026448>] (__do_kernel_fault+0x64/0x74)
[<c0026448>] (__do_kernel_fault+0x64/0x74) from [<c0026610>] (do_page_fault+0x1b8/0x1cc)
[<c0026610>] (do_page_fault+0x1b8/0x1cc) from [<c00202d4>] (do_DataAbort+0x34/0x94)
[<c00202d4>] (do_DataAbort+0x34/0x94) from [<c0020a60>] (__dabt_svc+0x40/0x60)
Exception stack(0xc0327ea8 to 0xc0327ef0)
7ea0: bf0026b0 c0327ef0 c0327ee4 00000000 bf002590 00000093
7ec0: 00000001 bf0026b0 bf002990 00000000 00000008 0000143d 00003f00 c0327ef0
7ee0: bf001364 bf001360 20000093 ffffffff
[<c0020a60>] (__dabt_svc+0x40/0x60) from [<bf001360>] (s3c2410_udc_irq+0x5b8/0x778 [s3c2410_udc])
[<bf001360>] (s3c2410_udc_irq+0x5b8/0x778 [s3c2410_udc]) from [<c0058aa0>] (handle_IRQ_event+0x3c/0x104)
[<c0058aa0>] (handle_IRQ_event+0x3c/0x104) from [<c005a428>] (handle_edge_irq+0x12c/0x164)
[<c005a428>] (handle_edge_irq+0x12c/0x164) from [<c0020068>] (asm_do_IRQ+0x68/0x88)
[<c0020068>] (asm_do_IRQ+0x68/0x88) from [<c0020aa4>] (__irq_svc+0x24/0xa0)
Signed-off-by: Vladimir Zapolskiy <vzapolskiy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/gadget/s3c2410_udc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/gadget/s3c2410_udc.c b/drivers/usb/gadget/s3c2410_udc.c index e724a051bfd..ea2b3c7ebee 100644 --- a/drivers/usb/gadget/s3c2410_udc.c +++ b/drivers/usb/gadget/s3c2410_udc.c @@ -735,6 +735,10 @@ static void s3c2410_udc_handle_ep0_idle(struct s3c2410_udc *dev, else dev->ep0state = EP0_OUT_DATA_PHASE; + if (!dev->driver) + return; + + /* deliver the request to the gadget driver */ ret = dev->driver->setup(&dev->gadget, crq); if (ret < 0) { if (dev->req_config) { |