From: Vinod Koul Date: Thu, 6 Mar 2014 06:54:08 +0000 (+0530) Subject: dmaengine: at_hdmac: use tasklet_kill in teardown X-Git-Tag: v3.15-rc1~39^2~7^2~1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ccc7aad04c95c33407444b1387e42162925e5216;p=karo-tx-linux.git dmaengine: at_hdmac: use tasklet_kill in teardown As discussed in [1] the tasklet_disable is not a proper function for teardown. We need to ensure irq is disabled, followed by ensuring that don't schedule any more tasklets and then its safe to use tasklet_kill(). Here in at_hdmac driver we use free_irq() before tasklet_kill(). The free_irq() will ensure that the irq is disabled and also wait till all scheduled interrupts are executed by invoking synchronize_irq(). So we need to only do tasklet_kill() after invoking free_irq() [1]: http://lwn.net/Articles/588457/ Reported-by: Thomas Gleixner Acked-by: Nicolas Ferre Reviewed-by: Thomas Gleixner Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index e2c04dc81e2a..c13a3bb0f594 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -1569,7 +1569,6 @@ static int at_dma_remove(struct platform_device *pdev) /* Disable interrupts */ atc_disable_chan_irq(atdma, chan->chan_id); - tasklet_disable(&atchan->tasklet); tasklet_kill(&atchan->tasklet); list_del(&chan->device_node);