dmaengine: idxd: Remove unnecessary synchronize_irq() before free_irq()

mainline inclusion
from mainline-v5.19
commit 411dccf9
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO
CVE: NA

Intel-SIG: commit 411dccf9 dmaengine: idxd: Remove unnecessary synchronize_irq() before free_irq().
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

Calling synchronize_irq() right before free_irq() is quite useless. On one
hand the IRQ can easily fire again before free_irq() is entered, on the
other hand free_irq() itself calls synchronize_irq() internally (in a race
condition free way), before any state associated with the IRQ is freed.
Signed-off-by: NMinghao Chi <chi.minghao@zte.com.cn>
Link: https://lore.kernel.org/r/20220516115412.1651772-1-chi.minghao@zte.com.cnAcked-by: NDave Jiang <dave.jiang@intel.com>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NXiaochen Shen <xiaochen.shen@intel.com>

drivers/dma/idxd/device.c

@@ -1182,7 +1182,6 @@ void idxd_wq_free_irq(struct idxd_wq *wq)
 	if (wq->type != IDXD_WQT_KERNEL)
 		return;
 
-	synchronize_irq(ie->vector);
 	free_irq(ie->vector, ie);
 	idxd_flush_pending_descs(ie);
 	if (idxd->request_int_handles)