6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dave Jiang dave.jiang@intel.com
[ 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 --- drivers/dma/idxd/cdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index ba53675ced55a..6cfcef3cf4cd1 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -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);