diff options
| author | Andrey Rusalin <arusalin@dev.rtsoft.ru> | 2016-12-28 20:10:59 +0300 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2017-04-02 01:06:23 +0200 |
| commit | 32ecc75ded72e0425713a7ffe2050fef6e54e564 (patch) | |
| tree | 1aeff43036098aa123db09c34fa87b18f0087b14 /drivers/nfc/pn533/usb.c | |
| parent | 5dd9c1bd61a7b684e54897a3a2546124c4077eda (diff) | |
| download | linux-32ecc75ded72e0425713a7ffe2050fef6e54e564.tar.bz2 | |
NFC: pn533: change order operations in dev registation
Sometimes during probing and registration of pn533_i2c
NULL pointer dereference happens.
Reproduced in cycle of inserting and removing pn533_i2c
and pn533 modules.
Backtrace:
[<8004205c>] (__queue_work) from [<80042324>] (queue_work_on+0x50/0x5c)
r10:acdc7c80 r9:8006b330 r8:ac0dfb40 r7:ac50c600 r6:00000004 r5:acbbee40 r4:600f0113
[<800422d4>] (queue_work_on) from [<7f7d5b6c>] (pn533_recv_frame+0x158/0x1fc [pn533])
r7:ffffff87 r6:00000000 r5:acbbee40 r4:acbbee00
[<7f7d5a14>] (pn533_recv_frame [pn533]) from [<7f7df4b8>] (pn533_i2c_irq_thread_fn+0x184/0x)
r6:acb2a000 r5:00000000 r4:acdc7b90
[<7f7df334>] (pn533_i2c_irq_thread_fn [pn533_i2c]) from [<8006b354>] (irq_thread_fn+0x24/0x)
r7:00000000 r6:accde000 r5:ac0dfb40 r4:acdc7c80
...
Seems there is some race condition due registration of
irq handler until all data stuctures that could be needed
are ready. So I re-ordered some ops. After this, problem has gone.
Changes in USB part was not tested, but it should not break
anything.
Signed-off-by: Andrey Rusalin <arusalin@dev.rtsoft.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/nfc/pn533/usb.c')
| -rw-r--r-- | drivers/nfc/pn533/usb.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/nfc/pn533/usb.c b/drivers/nfc/pn533/usb.c index 33ed78be2750..000159ea9c5f 100644 --- a/drivers/nfc/pn533/usb.c +++ b/drivers/nfc/pn533/usb.c @@ -543,6 +543,10 @@ static int pn533_usb_probe(struct usb_interface *interface, phy->priv = priv; + rc = pn533_finalize_setup(priv); + if (rc) + goto error; + usb_set_intfdata(interface, phy); return 0; |