6.4-stable review patch. If anyone has any objections, please let me know.
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From: Fenghua Yu fenghua.yu@intel.com
[ Upstream commit 0056a7f07b0a63e6cee815a789eabba6f3a710f0 ]
ATS disable status in a WQ is read-only if the device is not configurable. This change ensures that the ATS disable attribute can be modified via sysfs only on configurable devices.
Fixes: 92de5fa2dc39 ("dmaengine: idxd: add ATS disable knob for work queues") Signed-off-by: Fenghua Yu fenghua.yu@intel.com Reviewed-by: Dave Jiang dave.jiang@intel.com Link: https://lore.kernel.org/r/20230811012635.535413-1-fenghua.yu@intel.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/idxd/sysfs.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index d16c16445c4f9..66c89b07b3f7b 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -1088,12 +1088,16 @@ static ssize_t wq_ats_disable_store(struct device *dev, struct device_attribute const char *buf, size_t count) { struct idxd_wq *wq = confdev_to_wq(dev); + struct idxd_device *idxd = wq->idxd; bool ats_dis; int rc;
if (wq->state != IDXD_WQ_DISABLED) return -EPERM;
+ if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) + return -EPERM; + rc = kstrtobool(buf, &ats_dis); if (rc < 0) return rc;