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From: Dennis Dalessandro <dennis.dalessandro@intel.com>
To: jgg@ziepe.ca, dledford@redhat.com
Cc: linux-rdma@vger.kernel.org,
	Mike Marciniszyn <mike.marciniszyn@intel.com>,
	stable@vger.kernel.org, Kaike Wan <kaike.wan@intel.com>
Subject: [PATCH for-rc 2/2] IB/hfi1: Fix module use count flaw due to leftover module put calls
Date: Tue, 23 Jun 2020 16:32:30 -0400	[thread overview]
Message-ID: <20200623203230.106975.76240.stgit@awfm-01.aw.intel.com> (raw)
In-Reply-To: <20200623202519.106975.94246.stgit@awfm-01.aw.intel.com>

When the try_module_get calls were removed from opening and closing of
the i2c debugfs file, the corresponding module_put calls were missed.
This results in an inaccurate module use count that requires a power
cycle to fix.

Fixes: 09fbca8e6240 ("IB/hfi1: No need to use try_module_get for debugfs")
Cc: <stable@vger.kernel.org>
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
---
 drivers/infiniband/hw/hfi1/debugfs.c |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/debugfs.c b/drivers/infiniband/hw/hfi1/debugfs.c
index 4633a0c..2ced236 100644
--- a/drivers/infiniband/hw/hfi1/debugfs.c
+++ b/drivers/infiniband/hw/hfi1/debugfs.c
@@ -985,15 +985,10 @@ static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
 static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
 {
 	struct hfi1_pportdata *ppd;
-	int ret;
 
 	ppd = private2ppd(fp);
 
-	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
-	if (ret) /* failed - release the module */
-		module_put(THIS_MODULE);
-
-	return ret;
+	return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
 }
 
 static int i2c1_debugfs_open(struct inode *in, struct file *fp)
@@ -1013,7 +1008,6 @@ static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
 	ppd = private2ppd(fp);
 
 	release_chip_resource(ppd->dd, i2c_target(target));
-	module_put(THIS_MODULE);
 
 	return 0;
 }
@@ -1031,18 +1025,10 @@ static int i2c2_debugfs_release(struct inode *in, struct file *fp)
 static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
 {
 	struct hfi1_pportdata *ppd;
-	int ret;
-
-	if (!try_module_get(THIS_MODULE))
-		return -ENODEV;
 
 	ppd = private2ppd(fp);
 
-	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
-	if (ret) /* failed - release the module */
-		module_put(THIS_MODULE);
-
-	return ret;
+	return acquire_chip_resource(ppd->dd, i2c_target(target), 0);
 }
 
 static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
@@ -1062,7 +1048,6 @@ static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
 	ppd = private2ppd(fp);
 
 	release_chip_resource(ppd->dd, i2c_target(target));
-	module_put(THIS_MODULE);
 
 	return 0;
 }


  parent reply	other threads:[~2020-06-23 20:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23 20:32 [PATCH for-rc 0/2] Fixes for module unload Dennis Dalessandro
2020-06-23 20:32 ` [PATCH for-rc 1/2] IB/hfi1: Restore kfree in dummy_netdev cleanup Dennis Dalessandro
2020-06-24 18:53   ` Jason Gunthorpe
2020-06-25 18:11     ` Marciniszyn, Mike
2020-06-23 20:32 ` Dennis Dalessandro [this message]
2020-06-24 19:01 ` [PATCH for-rc 0/2] Fixes for module unload Jason Gunthorpe
2020-06-25 11:46   ` Dennis Dalessandro

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