[PATCH] UHCI: improve debugging code
This patch (as626) makes some improvements to the debugging code in
uhci-hcd. The main change is that now the code won't get compiled if
CONFIG_USB_DEBUG isn't set. But there are other changes too, like
adding a missing .owner field and printing a debugging dump if the
controller dies.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 9865f30..4edb833 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -68,12 +68,16 @@
* debug = 3, show all TDs in URBs when dumping
*/
#ifdef DEBUG
+#define DEBUG_CONFIGURED 1
static int debug = 1;
-#else
-static int debug = 0;
-#endif
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug level");
+
+#else
+#define DEBUG_CONFIGURED 0
+#define debug 0
+#endif
+
static char *errbuf;
#define ERRBUF_LEN (32 * 1024)
@@ -338,6 +342,12 @@
dev_err(uhci_dev(uhci),
"host controller halted, "
"very bad!\n");
+ if (debug > 1 && errbuf) {
+ /* Print the schedule for debugging */
+ uhci_sprint_schedule(uhci,
+ errbuf, ERRBUF_LEN);
+ lprintk(errbuf);
+ }
hc_died(uhci);
/* Force a callback in case there are
@@ -376,6 +386,14 @@
{
int i;
+ if (DEBUG_CONFIGURED) {
+ spin_lock_irq(&uhci->lock);
+ uhci->is_initialized = 0;
+ spin_unlock_irq(&uhci->lock);
+
+ debugfs_remove(uhci->dentry);
+ }
+
for (i = 0; i < UHCI_NUM_SKELQH; i++)
uhci_free_qh(uhci, uhci->skelqh[i]);
@@ -390,8 +408,6 @@
dma_free_coherent(uhci_dev(uhci),
UHCI_NUMFRAMES * sizeof(*uhci->frame),
uhci->frame, uhci->frame_dma_handle);
-
- debugfs_remove(uhci->dentry);
}
static int uhci_reset(struct usb_hcd *hcd)
@@ -474,17 +490,6 @@
hcd->uses_new_polling = 1;
- dentry = debugfs_create_file(hcd->self.bus_name,
- S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root, uhci,
- &uhci_debug_operations);
- if (!dentry) {
- dev_err(uhci_dev(uhci),
- "couldn't create uhci debugfs entry\n");
- retval = -ENOMEM;
- goto err_create_debug_entry;
- }
- uhci->dentry = dentry;
-
uhci->fsbr = 0;
uhci->fsbrtimeout = 0;
@@ -495,6 +500,19 @@
init_waitqueue_head(&uhci->waitqh);
+ if (DEBUG_CONFIGURED) {
+ dentry = debugfs_create_file(hcd->self.bus_name,
+ S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
+ uhci, &uhci_debug_operations);
+ if (!dentry) {
+ dev_err(uhci_dev(uhci), "couldn't create uhci "
+ "debugfs entry\n");
+ retval = -ENOMEM;
+ goto err_create_debug_entry;
+ }
+ uhci->dentry = dentry;
+ }
+
uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
UHCI_NUMFRAMES * sizeof(*uhci->frame),
&uhci->frame_dma_handle, 0);
@@ -609,6 +627,7 @@
mb();
configure_hc(uhci);
+ uhci->is_initialized = 1;
start_rh(uhci);
return 0;
@@ -872,16 +891,15 @@
if (usb_disabled())
return -ENODEV;
- if (debug) {
+ if (DEBUG_CONFIGURED) {
errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
if (!errbuf)
goto errbuf_failed;
+ uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
+ if (!uhci_debugfs_root)
+ goto debug_failed;
}
- uhci_debugfs_root = debugfs_create_dir("uhci", NULL);
- if (!uhci_debugfs_root)
- goto debug_failed;
-
uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
sizeof(struct urb_priv), 0, 0, NULL, NULL);
if (!uhci_up_cachep)