dmaengine: pxa_dma: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Also, because there is no need to save the file dentry, remove the
variable that was saving it as it was never even being used once set.

Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c
index b429642f3e7aa91a03c9416ae151c401571d381d..0f698f49ee264a88dc9fb3889ee20ada1441e374 100644 (file)
--- a/drivers/dma/pxa_dma.c
+++ b/drivers/dma/pxa_dma.c
@@ -132,7 +132,6 @@ struct pxad_device {
        spinlock_t                      phy_lock;       /* Phy association */
 #ifdef CONFIG_DEBUG_FS
        struct dentry                   *dbgfs_root;
-       struct dentry                   *dbgfs_state;
        struct dentry                   **dbgfs_chan;
 #endif
 };
@@ -326,31 +325,18 @@ static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev,
                                             int ch, struct dentry *chandir)
 {
        char chan_name[11];
-       struct dentry *chan, *chan_state = NULL, *chan_descr = NULL;
-       struct dentry *chan_reqs = NULL;
+       struct dentry *chan;
        void *dt;
 
        scnprintf(chan_name, sizeof(chan_name), "%d", ch);
        chan = debugfs_create_dir(chan_name, chandir);
        dt = (void *)&pdev->phys[ch];
 
-       if (chan)
-               chan_state = debugfs_create_file("state", 0400, chan, dt,
-                                                &chan_state_fops);
-       if (chan_state)
-               chan_descr = debugfs_create_file("descriptors", 0400, chan, dt,
-                                                &descriptors_fops);
-       if (chan_descr)
-               chan_reqs = debugfs_create_file("requesters", 0400, chan, dt,
-                                               &requester_chan_fops);
-       if (!chan_reqs)
-               goto err_state;
+       debugfs_create_file("state", 0400, chan, dt, &chan_state_fops);
+       debugfs_create_file("descriptors", 0400, chan, dt, &descriptors_fops);
+       debugfs_create_file("requesters", 0400, chan, dt, &requester_chan_fops);
 
        return chan;
-
-err_state:
-       debugfs_remove_recursive(chan);
-       return NULL;
 }
 
 static void pxad_init_debugfs(struct pxad_device *pdev)
@@ -358,40 +344,20 @@ static void pxad_init_debugfs(struct pxad_device *pdev)
        int i;
        struct dentry *chandir;
 
-       pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL);
-       if (IS_ERR(pdev->dbgfs_root) || !pdev->dbgfs_root)
-               goto err_root;
-
-       pdev->dbgfs_state = debugfs_create_file("state", 0400, pdev->dbgfs_root,
-                                               pdev, &state_fops);
-       if (!pdev->dbgfs_state)
-               goto err_state;
-
        pdev->dbgfs_chan =
-               kmalloc_array(pdev->nr_chans, sizeof(*pdev->dbgfs_state),
+               kmalloc_array(pdev->nr_chans, sizeof(struct dentry *),
                              GFP_KERNEL);
        if (!pdev->dbgfs_chan)
-               goto err_alloc;
+               return;
+
+       pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL);
+
+       debugfs_create_file("state", 0400, pdev->dbgfs_root, pdev, &state_fops);
 
        chandir = debugfs_create_dir("channels", pdev->dbgfs_root);
-       if (!chandir)
-               goto err_chandir;
 
-       for (i = 0; i < pdev->nr_chans; i++) {
+       for (i = 0; i < pdev->nr_chans; i++)
                pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir);
-               if (!pdev->dbgfs_chan[i])
-                       goto err_chans;
-       }
-
-       return;
-err_chans:
-err_chandir:
-       kfree(pdev->dbgfs_chan);
-err_alloc:
-err_state:
-       debugfs_remove_recursive(pdev->dbgfs_root);
-err_root:
-       pr_err("pxad: debugfs is not available\n");
 }
 
 static void pxad_cleanup_debugfs(struct pxad_device *pdev)