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dmaengine: idxd: add RO check for wq max_transfer_size write
[ Upstream commit505a2d1032
] 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>
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@ -905,6 +905,9 @@ static ssize_t wq_max_transfer_size_store(struct device *dev, struct device_attr
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u64 xfer_size;
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u64 xfer_size;
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int rc;
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int rc;
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if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
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return -EPERM;
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if (wq->state != IDXD_WQ_DISABLED)
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if (wq->state != IDXD_WQ_DISABLED)
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return -EPERM;
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return -EPERM;
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