[PATCH 5.11 010/122] dmaengine: idxd: fix wq size store permission state

Greg Kroah-Hartman
2021-04-19T13:07:48Z

From: Dave Jiang <dave.jiang@intel.com>

[ Upstream commit 0fff71c5a311e1264988179f7dcc217fda15fadd ]

WQ size can only be changed when the device is disabled. Current code
allows change when device is enabled but wq is disabled. Change the check
to detect device state.

Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/161782558755.107710.18138252584838406025.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 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index c27ca01cf8b2..5f7bc4b1621a 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -989,7 +989,7 @@ static ssize_t wq_size_store(struct device *dev,
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;

- if (wq->state != IDXD_WQ_DISABLED)
+ if (idxd->state == IDXD_DEV_ENABLED)
return -EPERM;

if (size + total_claimed_wq_size(idxd) - wq->size > idxd->max_wq_size)
--
2.30.2