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authorPete Zaitcev <zaitcev@redhat.com>2005-12-16 00:39:36 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-04 13:48:31 -0800
commit5ba35bd8f9a4fa6b92ef707826c47a1466ece460 (patch)
tree2c180db14baa56d05dca8ff66d78bb97348a60cb /drivers/usb/storage/libusual.c
parenta00828e9ac62caed7b830d631914d7748817ccd1 (diff)
downloadop-kernel-dev-5ba35bd8f9a4fa6b92ef707826c47a1466ece460.zip
op-kernel-dev-5ba35bd8f9a4fa6b92ef707826c47a1466ece460.tar.gz
[PATCH] USB: make bias writeable in libusual
Make the bias parameter writeable. Writing the parameter does not trigger a rebind of currently attached storage devices. Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/storage/libusual.c')
-rw-r--r--drivers/usb/storage/libusual.c53
1 files changed, 27 insertions, 26 deletions
diff --git a/drivers/usb/storage/libusual.c b/drivers/usb/storage/libusual.c
index 61f73d8..2680c69 100644
--- a/drivers/usb/storage/libusual.c
+++ b/drivers/usb/storage/libusual.c
@@ -24,10 +24,9 @@ static DEFINE_SPINLOCK(usu_lock);
/*
*/
#define USB_US_DEFAULT_BIAS USB_US_TYPE_STOR
+static atomic_t usu_bias = ATOMIC_INIT(USB_US_DEFAULT_BIAS);
#define BIAS_NAME_SIZE (sizeof("usb-storage"))
-static char bias[BIAS_NAME_SIZE];
-static int usb_usual_bias;
static const char *bias_names[3] = { "none", "usb-storage", "ub" };
static DECLARE_MUTEX_LOCKED(usu_init_notify);
@@ -35,7 +34,6 @@ static DECLARE_COMPLETION(usu_end_notify);
static atomic_t total_threads = ATOMIC_INIT(0);
static int usu_probe_thread(void *arg);
-static int parse_bias(const char *bias_s);
/*
* The table.
@@ -107,7 +105,7 @@ int usb_usual_check_type(const struct usb_device_id *id, int caller_type)
if (id_type == caller_type)
return 0;
/* Drivers grab devices biased to them */
- if (id_type == USB_US_TYPE_NONE && caller_type == usb_usual_bias)
+ if (id_type == USB_US_TYPE_NONE && caller_type == atomic_read(&usu_bias))
return 0;
return -ENODEV;
}
@@ -124,7 +122,7 @@ static int usu_probe(struct usb_interface *intf,
type = USB_US_TYPE(id->driver_info);
if (type == 0)
- type = usb_usual_bias;
+ type = atomic_read(&usu_bias);
spin_lock_irqsave(&usu_lock, flags);
if ((stat[type].fls & (USU_MOD_FL_THREAD|USU_MOD_FL_PRESENT)) != 0) {
@@ -206,9 +204,6 @@ static int __init usb_usual_init(void)
{
int rc;
- bias[BIAS_NAME_SIZE-1] = 0;
- usb_usual_bias = parse_bias(bias);
-
rc = usb_register(&usu_driver);
up(&usu_init_notify);
return rc;
@@ -231,36 +226,42 @@ static void __exit usb_usual_exit(void)
/*
* Validate and accept the bias parameter.
- * Maybe make an sysfs method later. XXX
*/
-static int parse_bias(const char *bias_s)
+static int usu_set_bias(const char *bias_s, struct kernel_param *kp)
{
int i;
+ int len;
int bias_n = 0;
- if (bias_s[0] == 0 || bias_s[0] == ' ') {
- bias_n = USB_US_DEFAULT_BIAS;
- } else {
- for (i = 1; i < 3; i++) {
- if (strcmp(bias_s, bias_names[i]) == 0) {
- bias_n = i;
- break;
- }
- }
- if (bias_n == 0) {
- bias_n = USB_US_DEFAULT_BIAS;
- printk(KERN_INFO
- "libusual: unknown bias \"%s\", using \"%s\"\n",
- bias_s, bias_names[bias_n]);
+ len = strlen(bias_s);
+ if (len == 0)
+ return -EDOM;
+ if (bias_s[len-1] == '\n')
+ --len;
+
+ for (i = 1; i < 3; i++) {
+ if (strncmp(bias_s, bias_names[i], len) == 0) {
+ bias_n = i;
+ break;
}
}
- return bias_n;
+ if (bias_n == 0)
+ return -EINVAL;
+
+ atomic_set(&usu_bias, bias_n);
+ return 0;
+}
+
+static int usu_get_bias(char *buffer, struct kernel_param *kp)
+{
+ return strlen(strcpy(buffer, bias_names[atomic_read(&usu_bias)]));
}
module_init(usb_usual_init);
module_exit(usb_usual_exit);
-module_param_string(bias, bias, BIAS_NAME_SIZE, S_IRUGO|S_IWUSR);
+module_param_call(bias, usu_set_bias, usu_get_bias, NULL, S_IRUGO|S_IWUSR);
+__MODULE_PARM_TYPE(bias, "string");
MODULE_PARM_DESC(bias, "Bias to usb-storage or ub");
MODULE_LICENSE("GPL");
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