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dmaengine: idxd: add RO check for wq max_batch_size write
[ Upstream commit66903461ff
] Block wq_max_batch_size_store() when the device is configured as read-only and not configurable. Fixes:e7184b159d
("dmaengine: idxd: add support for configurable max wq batch 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/164971493551.2201159.1942042593642155209.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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@ -939,6 +939,9 @@ static ssize_t wq_max_batch_size_store(struct device *dev, struct device_attribu
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u64 batch_size;
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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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return -EPERM;
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