On Fri, 21 Feb 2014, Alexandre Bounine wrote: > This patch is a modification of the patch originally proposed > by Xiaotian Feng <[email protected]>: https://lkml.org/lkml/2012/11/5/413 > This new version disables DMA channel interrupts and ensures that the tasklet > wil not be scheduled again before calling tasklet_kill(). > > Unfortunately the updated patch was not released at that time due to planned > rework of Tsi721 mport driver to use threaded interrupts (which has yet to > happen). > Recently the issue was reported again: https://lkml.org/lkml/2014/2/19/762. > > Description from the original Xiaotian's patch: > > "Some drivers use tasklet_disable in device remove/release process, > tasklet_disable will inc tasklet->count and return. If the tasklet is > not handled yet under some softirq pressure, the tasklet will be > placed on the tasklet_vec, never have a chance to be excuted. This > might lead to a heavy loaded ksoftirqd, wakeup with pending_softirq, > but tasklet is disabled. tasklet_kill should be used in this case." > > This patch is applicable to kernel versions starting from v3.5. > > Signed-off-by: Alexandre Bounine <[email protected]> > Cc: Matt Porter <[email protected]> > Cc: Xiaotian Feng <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Mike Galbraith <[email protected]> > Cc: <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
