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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull irq fix from Thomas Gleixner:
 "A small fix for the affinity spreading code.

  It failed to handle situations where a single vector was requested
  either due to only one CPU being available or vector exhaustion
  causing only a single interrupt to be granted.

  The fix is to simply remove the requirement in the affinity spreading
  code for more than one interrupt being available"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/affinity: Create affinity mask for single vector
alistair/sunxi64-5.4-dsi
Linus Torvalds 2019-08-10 15:46:25 -07:00
parent 6054f4ecdc 491beed3b1
commit ed254bb54f
1 changed files with 2 additions and 4 deletions
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6
kernel/irq/affinity.c
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@ -251,11 +251,9 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
* Determine the number of vectors which need interrupt affinities
* assigned. If the pre/post request exhausts the available vectors
* then nothing to do here except for invoking the calc_sets()
* callback so the device driver can adjust to the situation. If there
* is only a single vector, then managing the queue is pointless as
* well.
* callback so the device driver can adjust to the situation.
*/
if (nvecs > 1 && nvecs > affd->pre_vectors + affd->post_vectors)
if (nvecs > affd->pre_vectors + affd->post_vectors)
affvecs = nvecs - affd->pre_vectors - affd->post_vectors;
else
affvecs = 0;