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authorDave Jiang <dave.jiang@intel.com>2022-04-12 01:08:55 +0300
committerVinod Koul <vkoul@kernel.org>2022-04-20 14:54:42 +0300
commit66903461ffed0b66fc3e0200082d4e09365aacdc (patch)
tree2d59a74da11d82cc161aa3aae9c4cdfc026811fe /drivers/dma
parentbc3452cdfc468a65965d0ac397c940acb787ea4d (diff)
downloadlinux-66903461ffed0b66fc3e0200082d4e09365aacdc.tar.xz
dmaengine: idxd: add RO check for wq max_batch_size write
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/idxd/sysfs.c3
1 files changed, 3 insertions, 0 deletions
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;