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    Subject[PATCH 5.17 050/146] dmaengine: idxd: add RO check for wq max_batch_size write
    Date
    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 7e19ab92b61a..6c41d429bd89 100644
    --- a/drivers/dma/idxd/sysfs.c
    +++ b/drivers/dma/idxd/sysfs.c
    @@ -939,6 +939,9 @@ 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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