Commit 505a2d10 authored by Dave Jiang's avatar Dave Jiang Committed by Vinod Koul
Browse files

dmaengine: idxd: add RO check for wq max_transfer_size write 



Block wq_max_transfer_size_store() when the device is configured as
read-only and not configurable.

Fixes: d7aad555 ("dmaengine: idxd: add support for configurable max wq xfer size")
Reported-by: default avatarBernice Zhang <bernice.zhang@intel.com>
Tested-by: default avatarBernice Zhang <bernice.zhang@intel.com>
Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164971488154.2200913.10706665404118545941.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 66903461

drivers/dma/idxd/sysfs.c

+3 −0
Original line number Diff line number Diff line
@@ -905,6 +905,9 @@ static ssize_t wq_max_transfer_size_store(struct device *dev, struct device_attr 
	u64 xfer_size;

	int rc;



	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))

		return -EPERM;



	if (wq->state != IDXD_WQ_DISABLED)

		return -EPERM;