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dmaengine: idxd: Fix ->poll() return value

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[ Upstream commit ae74cd15ade833adc289279b5c6f12e78f64d4d7 ]

The fix to block access from different address space did not return a
correct value for ->poll() change.  kernel test bot reported that a
return value of type __poll_t is expected rather than int. Fix to return
POLLNVAL to indicate invalid request.

Fixes: 8dfa57aabff6 ("dmaengine: idxd: Fix allowing write() from different address spaces")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202505081851.rwD7jVxg-lkp@intel.com/
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20250508170548.2747425-1-dave.jiang@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dave Jiang
2025-05-08 10:05:48 -07:00
committed by Greg Kroah-Hartman
parent 252f78a931
commit d31daa83ef
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/idxd/cdev.c
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@@ -505,7 +505,7 @@ static __poll_t idxd_cdev_poll(struct file *filp,
__poll_t out = 0;
if (current->mm != ctx->mm)
return -EPERM;
return POLLNVAL;
poll_wait(filp, &wq->err_queue, wait);
spin_lock(&idxd->dev_lock);