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dmaengine: idxd: Fix possible invalid memory access after FLR

In the case that the first Function Level Reset (FLR) concludes
correctly, but in the second FLR the scratch area for the saved
configuration cannot be allocated, it's possible for a invalid memory
access to happen.

Always set the deallocated scratch area to NULL after FLR completes.

Fixes: 98d187a98903 ("dmaengine: idxd: Enable Function Level Reset (FLR) for halt")
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Link: https://patch.msgid.link/20260121-idxd-fix-flr-on-kernel-queues-v3-v3-3-7ed70658a9d1@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

authored by

Vinicius Costa Gomes and committed by
Vinod Koul d6077df7 52d2edea

+1
+1
drivers/dma/idxd/init.c
··· 1146 1146 } 1147 1147 out: 1148 1148 kfree(idxd->idxd_saved); 1149 + idxd->idxd_saved = NULL; 1149 1150 } 1150 1151 1151 1152 static const struct pci_error_handlers idxd_error_handler = {