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dmaengine: idxd: add RO check for wq max_transfer_size write

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[ Upstream commit 505a2d1032ae656b0a8c736be110255503941cde ]

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

Fixes: d7aad5550e ("dmaengine: idxd: add support for configurable max wq xfer size")
Reported-by: Bernice Zhang <bernice.zhang@intel.com>
Tested-by: Bernice Zhang <bernice.zhang@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164971488154.2200913.10706665404118545941.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dave Jiang 2022-04-11 15:08:01 -07:00 committed by Greg Kroah-Hartman
parent 9a3c026dc3
commit 520aab8b72
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/idxd/sysfs.c
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@ -1098,6 +1098,9 @@ 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;