Commit 66903461 authored by Dave Jiang's avatar Dave Jiang Committed by Vinod Koul
Browse files

dmaengine: idxd: add RO check for wq max_batch_size write 



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

Fixes: e7184b15 ("dmaengine: idxd: add support for configurable max wq batch 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/164971493551.2201159.1942042593642155209.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent bc3452cd

drivers/dma/idxd/sysfs.c

+3 −0
Original line number Diff line number Diff line
@@ -939,6 +939,9 @@ static ssize_t wq_max_batch_size_store(struct device *dev, struct device_attribu 
	u64 batch_size;

	int rc;



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

		return -EPERM;



	if (wq->state != IDXD_WQ_DISABLED)

		return -EPERM;