| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 048/124] dmaengine: idxd: add RO check for wq max_batch_size write | Date | Tue, 26 Apr 2022 10:20:49 +0200 |
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From: Dave Jiang <dave.jiang@intel.com>
[ Upstream commit 66903461ffed0b66fc3e0200082d4e09365aacdc ]
Block wq_max_batch_size_store() when the device is configured as read-only and not configurable.
Fixes: e7184b159dd3 ("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> --- drivers/dma/idxd/sysfs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index 999ce13a93ad..f7ab5c077a2b 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -876,6 +876,9 @@ 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; -- 2.35.1
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