diff options
| author | Matthijs Kooijman <matthijs@stdin.nl> | 2012-11-02 16:13:55 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-12-22 00:26:10 +0400 |
| commit | d62b6818477704683d00c680335eff5833bd3906 (patch) | |
| tree | eabe4461b28170fddc8f40e1919d9c6505dcb942 /drivers/media/rc | |
| parent | 70ef69915b1fba4ad85aebe530caf156a144c2e5 (diff) | |
| download | linux-d62b6818477704683d00c680335eff5833bd3906.tar.xz | |
[media] rc: Set rdev before irq setup
This fixes a problem in fintek-cir and nuvoton-cir where the
irq handler would trigger during module load before the rdev member was
set, causing a NULL pointer crash.
It seems this crash is very reproducible (just bombard the receiver with
IR signals during module load), probably because when request_irq is
called, any pending intterupt is handled immediately, before
request_irq returns and rdev can be set.
This same crash was supposed to be fixed by commit
9ef449c6b31bb6a8e6dedc24de475a3b8c79be20 ("[media] rc: Postpone ISR
registration"), but the crash was still observed on the nuvoton-cir
driver.
This commit was tested on nuvoton-cir only.
Cc: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/rc')
| -rw-r--r-- | drivers/media/rc/fintek-cir.c | 4 | ||||
| -rw-r--r-- | drivers/media/rc/nuvoton-cir.c | 3 |
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/media/rc/fintek-cir.c b/drivers/media/rc/fintek-cir.c index 3d5e57cacf31..5eefe65760a4 100644 --- a/drivers/media/rc/fintek-cir.c +++ b/drivers/media/rc/fintek-cir.c @@ -557,6 +557,8 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id /* rx resolution is hardwired to 50us atm, 1, 25, 100 also possible */ rdev->rx_resolution = US_TO_NS(CIR_SAMPLE_PERIOD); + fintek->rdev = rdev; + ret = -EBUSY; /* now claim resources */ if (!request_region(fintek->cir_addr, @@ -572,7 +574,7 @@ static int fintek_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id goto exit_free_irq; device_init_wakeup(&pdev->dev, true); - fintek->rdev = rdev; + fit_pr(KERN_NOTICE, "driver has been successfully loaded\n"); if (debug) cir_dump_regs(fintek); diff --git a/drivers/media/rc/nuvoton-cir.c b/drivers/media/rc/nuvoton-cir.c index 3477e231c182..c6441e690dd4 100644 --- a/drivers/media/rc/nuvoton-cir.c +++ b/drivers/media/rc/nuvoton-cir.c @@ -1065,6 +1065,7 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id) /* tx bits */ rdev->tx_resolution = XYZ; #endif + nvt->rdev = rdev; ret = -EBUSY; /* now claim resources */ @@ -1089,7 +1090,7 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id) goto exit_free_wake_irq; device_init_wakeup(&pdev->dev, true); - nvt->rdev = rdev; + nvt_pr(KERN_NOTICE, "driver has been successfully loaded\n"); if (debug) { cir_dump_regs(nvt); |