diff options
| author | Maxim Levitsky <maximlevitsky@gmail.com> | 2007-11-04 19:34:23 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-01-25 19:02:44 -0200 |
| commit | 3203cb86d22c63504f8368151029bf9dad014ddb (patch) | |
| tree | c8bc84fcfb3f0b3b5d001f40b2d4a046e87de2e3 /drivers | |
| parent | 0d65cd4f2bfe70872e4218d9d35d37a7000d6739 (diff) | |
V4L/DVB (6668): Fix theoretical races between IRQ handler and .suspend/resume
*dev->insuspend = 1 should be set before synchronize_irq
*ACK interrupts after synchronize_irq, to make sure there aren't
pending interrupts.
*Add barrier before we restart interrupts so the handler will 100%
see the dev->insuspend
Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/saa7134/saa7134-core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/media/video/saa7134/saa7134-core.c b/drivers/media/video/saa7134/saa7134-core.c index 40cdec26a7f..85c165d1730 100644 --- a/drivers/media/video/saa7134/saa7134-core.c +++ b/drivers/media/video/saa7134/saa7134-core.c @@ -1181,8 +1181,13 @@ static int saa7134_suspend(struct pci_dev *pci_dev , pm_message_t state) saa_writel(SAA7134_IRQ2, 0); saa_writel(SAA7134_MAIN_CTRL, 0); - synchronize_irq(pci_dev->irq); dev->insuspend = 1; + synchronize_irq(pci_dev->irq); + + /* ACK interrupts once more, just in case, + since the IRQ handler won't ack them anymore*/ + + saa_writel(SAA7134_IRQ_REPORT, saa_readl(SAA7134_IRQ_REPORT)); /* Disable timeout timers - if we have active buffers, we will fill them on resume*/ @@ -1246,6 +1251,7 @@ static int saa7134_resume(struct pci_dev *pci_dev) /* start DMA now*/ dev->insuspend = 0; + smp_wmb(); saa7134_set_dmabits(dev); spin_unlock_irqrestore(&dev->slock, flags); |