Alexandre Bounine 04379dffdd rapidio/tsi721: fix tasklet termination in dma channel release ... This patch is a modification of the patch originally proposed by Xiaotian Feng <xtfeng@gmail.com>: 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 <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Xiaotian Feng <xtfeng@gmail.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Galbraith <bitbucket@online.de> Cc: <stable@vger.kernel.org> [3.5+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-03-04 07:55:49 -08:00
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devices	rapidio/tsi721: fix tasklet termination in dma channel release	2014-03-04 07:55:49 -08:00
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