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authorJon Mason <jon.mason@intel.com>2013-07-30 15:58:49 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-13 12:08:12 +0900
commit51dcd49f16772e41318fee7ad5b477661f0c84df (patch)
tree113bd9ce4644e56ba43c53519f37b8c0e1b12a42
parent5da1ca75f78746e35357679c184d2107d880e9ec (diff)
NTB: Correct debugfs to work with more than 1 NTB Device
commit 1517a3f21a1dd321f16bcf44204bddff9d21abd0 upstream. Debugfs was setup in NTB to only have a single debugfs directory. This resulted in the leaking of debugfs directories and files when multiple NTB devices were present, due to each device stomping on the variables containing the previous device's values (thus preventing them from being freed on cleanup). Correct this by creating a secondary directory of the PCI BDF for each device present, and nesting the previously existing information in those directories. Signed-off-by: Jon Mason <jon.mason@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/ntb/ntb_hw.c27
-rw-r--r--drivers/ntb/ntb_hw.h16
-rw-r--r--drivers/ntb/ntb_transport.c17
3 files changed, 48 insertions, 12 deletions
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index 26b808b4d3a0..b9bf8b551e3c 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -78,6 +78,8 @@ enum {
BWD_HW,
};
+static struct dentry *debugfs_dir;
+
/* Translate memory window 0,1 to BAR 2,4 */
#define MW_TO_BAR(mw) (mw * 2 + 2)
@@ -998,6 +1000,28 @@ static void ntb_free_callbacks(struct ntb_device *ndev)
kfree(ndev->db_cb);
}
+static void ntb_setup_debugfs(struct ntb_device *ndev)
+{
+ if (!debugfs_initialized())
+ return;
+
+ if (!debugfs_dir)
+ debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+
+ ndev->debugfs_dir = debugfs_create_dir(pci_name(ndev->pdev),
+ debugfs_dir);
+}
+
+static void ntb_free_debugfs(struct ntb_device *ndev)
+{
+ debugfs_remove_recursive(ndev->debugfs_dir);
+
+ if (debugfs_dir && simple_empty(debugfs_dir)) {
+ debugfs_remove_recursive(debugfs_dir);
+ debugfs_dir = NULL;
+ }
+}
+
static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct ntb_device *ndev;
@@ -1010,6 +1034,7 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
ndev->pdev = pdev;
ndev->link_status = NTB_LINK_DOWN;
pci_set_drvdata(pdev, ndev);
+ ntb_setup_debugfs(ndev);
rc = pci_enable_device(pdev);
if (rc)
@@ -1106,6 +1131,7 @@ err2:
err1:
pci_disable_device(pdev);
err:
+ ntb_free_debugfs(ndev);
kfree(ndev);
dev_err(&pdev->dev, "Error loading %s module\n", KBUILD_MODNAME);
@@ -1135,6 +1161,7 @@ static void ntb_pci_remove(struct pci_dev *pdev)
iounmap(ndev->reg_base);
pci_release_selected_regions(pdev, NTB_BAR_MASK);
pci_disable_device(pdev);
+ ntb_free_debugfs(ndev);
kfree(ndev);
}
diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h
index 3a3038ca83e6..6a4f56f564ee 100644
--- a/drivers/ntb/ntb_hw.h
+++ b/drivers/ntb/ntb_hw.h
@@ -127,6 +127,8 @@ struct ntb_device {
unsigned char link_status;
struct delayed_work hb_timer;
unsigned long last_ts;
+
+ struct dentry *debugfs_dir;
};
/**
@@ -155,6 +157,20 @@ static inline struct pci_dev *ntb_query_pdev(struct ntb_device *ndev)
return ndev->pdev;
}
+/**
+ * ntb_query_debugfs() - return the debugfs pointer
+ * @ndev: pointer to ntb_device instance
+ *
+ * Given the ntb pointer, return the debugfs directory pointer for the NTB
+ * hardware device
+ *
+ * RETURNS: a pointer to the debugfs directory
+ */
+static inline struct dentry *ntb_query_debugfs(struct ntb_device *ndev)
+{
+ return ndev->debugfs_dir;
+}
+
struct ntb_device *ntb_register_transport(struct pci_dev *pdev,
void *transport);
void ntb_unregister_transport(struct ntb_device *ndev);
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index f8d7081ee301..c3089151aa49 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -157,7 +157,6 @@ struct ntb_transport {
bool transport_link;
struct delayed_work link_work;
struct work_struct link_cleanup;
- struct dentry *debugfs_dir;
};
enum {
@@ -824,12 +823,12 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
qp->tx_max_frame = min(transport_mtu, tx_size / 2);
qp->tx_max_entry = tx_size / qp->tx_max_frame;
- if (nt->debugfs_dir) {
+ if (ntb_query_debugfs(nt->ndev)) {
char debugfs_name[4];
snprintf(debugfs_name, 4, "qp%d", qp_num);
qp->debugfs_dir = debugfs_create_dir(debugfs_name,
- nt->debugfs_dir);
+ ntb_query_debugfs(nt->ndev));
qp->debugfs_stats = debugfs_create_file("stats", S_IRUSR,
qp->debugfs_dir, qp,
@@ -857,11 +856,6 @@ int ntb_transport_init(struct pci_dev *pdev)
if (!nt)
return -ENOMEM;
- if (debugfs_initialized())
- nt->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
- else
- nt->debugfs_dir = NULL;
-
nt->ndev = ntb_register_transport(pdev, nt);
if (!nt->ndev) {
rc = -EIO;
@@ -907,7 +901,6 @@ err2:
err1:
ntb_unregister_transport(nt->ndev);
err:
- debugfs_remove_recursive(nt->debugfs_dir);
kfree(nt);
return rc;
}
@@ -921,16 +914,16 @@ void ntb_transport_free(void *transport)
nt->transport_link = NTB_LINK_DOWN;
/* verify that all the qp's are freed */
- for (i = 0; i < nt->max_qps; i++)
+ for (i = 0; i < nt->max_qps; i++) {
if (!test_bit(i, &nt->qp_bitmap))
ntb_transport_free_queue(&nt->qps[i]);
+ debugfs_remove_recursive(nt->qps[i].debugfs_dir);
+ }
ntb_bus_remove(nt);
cancel_delayed_work_sync(&nt->link_work);
- debugfs_remove_recursive(nt->debugfs_dir);
-
ntb_unregister_event_callback(nt->ndev);
pdev = ntb_query_pdev(nt->ndev);