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dmaengine: idxd: add RO check for wq max_batch_size write

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[ Upstream commit 66903461ffed0b66fc3e0200082d4e09365aacdc ]

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>
This commit is contained in:
Dave Jiang
2022-04-11 15:08:55 -07:00
committed by Greg Kroah-Hartman
parent f593f49fcd
commit 9a3c026dc3
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/idxd/sysfs.c
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@@ -1132,6 +1132,9 @@ static ssize_t wq_max_batch_size_store(struct device *dev, struct device_attribu
u64 batch_size; u64 batch_size;
int rc; int rc;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (wq->state != IDXD_WQ_DISABLED) if (wq->state != IDXD_WQ_DISABLED)
return -EPERM; return -EPERM;