diff options
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r-- | drivers/usb/gadget/dummy_hcd.c | 91 | ||||
-rw-r--r-- | drivers/usb/gadget/file_storage.c | 93 | ||||
-rw-r--r-- | drivers/usb/gadget/serial.c | 2 |
3 files changed, 114 insertions, 72 deletions
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c index c655d46..9734cb7 100644 --- a/drivers/usb/gadget/dummy_hcd.c +++ b/drivers/usb/gadget/dummy_hcd.c @@ -138,7 +138,7 @@ static const char *const ep_name [] = { /* or like sa1100: two fixed function endpoints */ "ep1out-bulk", "ep2in-bulk", }; -#define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *)) +#define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name) /*-------------------------------------------------------------------------*/ @@ -896,7 +896,7 @@ dummy_gadget_release (struct device *dev) #endif } -static int dummy_udc_probe (struct platform_device *dev) +static int dummy_udc_probe (struct platform_device *pdev) { struct dummy *dum = the_controller; int rc; @@ -909,7 +909,7 @@ static int dummy_udc_probe (struct platform_device *dev) dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0); strcpy (dum->gadget.dev.bus_id, "gadget"); - dum->gadget.dev.parent = &dev->dev; + dum->gadget.dev.parent = &pdev->dev; dum->gadget.dev.release = dummy_gadget_release; rc = device_register (&dum->gadget.dev); if (rc < 0) @@ -919,47 +919,47 @@ static int dummy_udc_probe (struct platform_device *dev) usb_bus_get (&dummy_to_hcd (dum)->self); #endif - platform_set_drvdata (dev, dum); + platform_set_drvdata (pdev, dum); device_create_file (&dum->gadget.dev, &dev_attr_function); return rc; } -static int dummy_udc_remove (struct platform_device *dev) +static int dummy_udc_remove (struct platform_device *pdev) { - struct dummy *dum = platform_get_drvdata (dev); + struct dummy *dum = platform_get_drvdata (pdev); - platform_set_drvdata (dev, NULL); + platform_set_drvdata (pdev, NULL); device_remove_file (&dum->gadget.dev, &dev_attr_function); device_unregister (&dum->gadget.dev); return 0; } -static int dummy_udc_suspend (struct platform_device *dev, pm_message_t state) +static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state) { - struct dummy *dum = platform_get_drvdata(dev); + struct dummy *dum = platform_get_drvdata(pdev); - dev_dbg (&dev->dev, "%s\n", __FUNCTION__); + dev_dbg (&pdev->dev, "%s\n", __FUNCTION__); spin_lock_irq (&dum->lock); dum->udc_suspended = 1; set_link_state (dum); spin_unlock_irq (&dum->lock); - dev->dev.power.power_state = state; + pdev->dev.power.power_state = state; usb_hcd_poll_rh_status (dummy_to_hcd (dum)); return 0; } -static int dummy_udc_resume (struct platform_device *dev) +static int dummy_udc_resume (struct platform_device *pdev) { - struct dummy *dum = platform_get_drvdata(dev); + struct dummy *dum = platform_get_drvdata(pdev); - dev_dbg (&dev->dev, "%s\n", __FUNCTION__); + dev_dbg (&pdev->dev, "%s\n", __FUNCTION__); spin_lock_irq (&dum->lock); dum->udc_suspended = 0; set_link_state (dum); spin_unlock_irq (&dum->lock); - dev->dev.power.power_state = PMSG_ON; + pdev->dev.power.power_state = PMSG_ON; usb_hcd_poll_rh_status (dummy_to_hcd (dum)); return 0; } @@ -1576,7 +1576,7 @@ static int dummy_hub_status (struct usb_hcd *hcd, char *buf) dum = hcd_to_dummy (hcd); spin_lock_irqsave (&dum->lock, flags); - if (hcd->state != HC_STATE_RUNNING) + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) goto done; if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) { @@ -1623,7 +1623,7 @@ static int dummy_hub_control ( int retval = 0; unsigned long flags; - if (hcd->state != HC_STATE_RUNNING) + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) return -ETIMEDOUT; dum = hcd_to_dummy (hcd); @@ -1756,9 +1756,12 @@ static int dummy_bus_suspend (struct usb_hcd *hcd) { struct dummy *dum = hcd_to_dummy (hcd); + dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__); + spin_lock_irq (&dum->lock); dum->rh_state = DUMMY_RH_SUSPENDED; set_link_state (dum); + hcd->state = HC_STATE_SUSPENDED; spin_unlock_irq (&dum->lock); return 0; } @@ -1766,14 +1769,23 @@ static int dummy_bus_suspend (struct usb_hcd *hcd) static int dummy_bus_resume (struct usb_hcd *hcd) { struct dummy *dum = hcd_to_dummy (hcd); + int rc = 0; + + dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__); spin_lock_irq (&dum->lock); - dum->rh_state = DUMMY_RH_RUNNING; - set_link_state (dum); - if (!list_empty(&dum->urbp_list)) - mod_timer (&dum->timer, jiffies); + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { + dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n"); + rc = -ENODEV; + } else { + dum->rh_state = DUMMY_RH_RUNNING; + set_link_state (dum); + if (!list_empty(&dum->urbp_list)) + mod_timer (&dum->timer, jiffies); + hcd->state = HC_STATE_RUNNING; + } spin_unlock_irq (&dum->lock); - return 0; + return rc; } /*-------------------------------------------------------------------------*/ @@ -1899,14 +1911,14 @@ static const struct hc_driver dummy_hcd = { .bus_resume = dummy_bus_resume, }; -static int dummy_hcd_probe (struct platform_device *dev) +static int dummy_hcd_probe(struct platform_device *pdev) { struct usb_hcd *hcd; int retval; - dev_info(&dev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); + dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); - hcd = usb_create_hcd (&dummy_hcd, &dev->dev, dev->dev.bus_id); + hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id); if (!hcd) return -ENOMEM; the_controller = hcd_to_dummy (hcd); @@ -1919,36 +1931,43 @@ static int dummy_hcd_probe (struct platform_device *dev) return retval; } -static int dummy_hcd_remove (struct platform_device *dev) +static int dummy_hcd_remove (struct platform_device *pdev) { struct usb_hcd *hcd; - hcd = platform_get_drvdata (dev); + hcd = platform_get_drvdata (pdev); usb_remove_hcd (hcd); usb_put_hcd (hcd); the_controller = NULL; return 0; } -static int dummy_hcd_suspend (struct platform_device *dev, pm_message_t state) +static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state) { struct usb_hcd *hcd; + struct dummy *dum; + int rc = 0; - dev_dbg (&dev->dev, "%s\n", __FUNCTION__); - hcd = platform_get_drvdata (dev); + dev_dbg (&pdev->dev, "%s\n", __FUNCTION__); - hcd->state = HC_STATE_SUSPENDED; - return 0; + hcd = platform_get_drvdata (pdev); + dum = hcd_to_dummy (hcd); + if (dum->rh_state == DUMMY_RH_RUNNING) { + dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); + rc = -EBUSY; + } else + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + return rc; } -static int dummy_hcd_resume (struct platform_device *dev) +static int dummy_hcd_resume (struct platform_device *pdev) { struct usb_hcd *hcd; - dev_dbg (&dev->dev, "%s\n", __FUNCTION__); - hcd = platform_get_drvdata (dev); - hcd->state = HC_STATE_RUNNING; + dev_dbg (&pdev->dev, "%s\n", __FUNCTION__); + hcd = platform_get_drvdata (pdev); + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); usb_hcd_poll_rh_status (hcd); return 0; } diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c index ea09aaa..0cea978 100644 --- a/drivers/usb/gadget/file_storage.c +++ b/drivers/usb/gadget/file_storage.c @@ -224,6 +224,7 @@ #include <linux/fs.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/kthread.h> #include <linux/limits.h> #include <linux/list.h> @@ -238,7 +239,6 @@ #include <linux/string.h> #include <linux/suspend.h> #include <linux/utsname.h> -#include <linux/wait.h> #include <linux/usb_ch9.h> #include <linux/usb_gadget.h> @@ -250,7 +250,7 @@ #define DRIVER_DESC "File-backed Storage Gadget" #define DRIVER_NAME "g_file_storage" -#define DRIVER_VERSION "20 October 2004" +#define DRIVER_VERSION "28 November 2005" static const char longname[] = DRIVER_DESC; static const char shortname[] = DRIVER_NAME; @@ -335,8 +335,8 @@ MODULE_LICENSE("Dual BSD/GPL"); #define MAX_LUNS 8 /* Arggh! There should be a module_param_array_named macro! */ -static char *file[MAX_LUNS] = {NULL, }; -static int ro[MAX_LUNS] = {0, }; +static char *file[MAX_LUNS]; +static int ro[MAX_LUNS]; static struct { int num_filenames; @@ -587,7 +587,7 @@ enum fsg_buffer_state { struct fsg_buffhd { void *buf; dma_addr_t dma; - volatile enum fsg_buffer_state state; + enum fsg_buffer_state state; struct fsg_buffhd *next; /* The NetChip 2280 is faster, and handles some protocol faults @@ -596,9 +596,9 @@ struct fsg_buffhd { unsigned int bulk_out_intended_length; struct usb_request *inreq; - volatile int inreq_busy; + int inreq_busy; struct usb_request *outreq; - volatile int outreq_busy; + int outreq_busy; }; enum fsg_state { @@ -631,13 +631,16 @@ struct fsg_dev { /* filesem protects: backing files in use */ struct rw_semaphore filesem; + /* reference counting: wait until all LUNs are released */ + struct kref ref; + struct usb_ep *ep0; // Handy copy of gadget->ep0 struct usb_request *ep0req; // For control responses - volatile unsigned int ep0_req_tag; + unsigned int ep0_req_tag; const char *ep0req_name; struct usb_request *intreq; // For interrupt responses - volatile int intreq_busy; + int intreq_busy; struct fsg_buffhd *intr_buffhd; unsigned int bulk_out_maxpacket; @@ -667,7 +670,6 @@ struct fsg_dev { struct fsg_buffhd *next_buffhd_to_drain; struct fsg_buffhd buffhds[NUM_BUFFERS]; - wait_queue_head_t thread_wqh; int thread_wakeup_needed; struct completion thread_notifier; struct task_struct *thread_task; @@ -694,7 +696,6 @@ struct fsg_dev { unsigned int nluns; struct lun *luns; struct lun *curlun; - struct completion lun_released; }; typedef void (*fsg_routine_t)(struct fsg_dev *); @@ -1073,11 +1074,13 @@ static int populate_config_buf(struct usb_gadget *gadget, /* These routines may be called in process context or in_irq */ +/* Caller must hold fsg->lock */ static void wakeup_thread(struct fsg_dev *fsg) { /* Tell the main thread that something has happened */ fsg->thread_wakeup_needed = 1; - wake_up_all(&fsg->thread_wqh); + if (fsg->thread_task) + wake_up_process(fsg->thread_task); } @@ -1164,11 +1167,12 @@ static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req) usb_ep_fifo_flush(ep); /* Hold the lock while we update the request and buffer states */ + smp_wmb(); spin_lock(&fsg->lock); bh->inreq_busy = 0; bh->state = BUF_STATE_EMPTY; - spin_unlock(&fsg->lock); wakeup_thread(fsg); + spin_unlock(&fsg->lock); } static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) @@ -1185,11 +1189,12 @@ static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req) usb_ep_fifo_flush(ep); /* Hold the lock while we update the request and buffer states */ + smp_wmb(); spin_lock(&fsg->lock); bh->outreq_busy = 0; bh->state = BUF_STATE_FULL; - spin_unlock(&fsg->lock); wakeup_thread(fsg); + spin_unlock(&fsg->lock); } @@ -1206,11 +1211,12 @@ static void intr_in_complete(struct usb_ep *ep, struct usb_request *req) usb_ep_fifo_flush(ep); /* Hold the lock while we update the request and buffer states */ + smp_wmb(); spin_lock(&fsg->lock); fsg->intreq_busy = 0; bh->state = BUF_STATE_EMPTY; - spin_unlock(&fsg->lock); wakeup_thread(fsg); + spin_unlock(&fsg->lock); } #else @@ -1261,8 +1267,8 @@ static void received_cbi_adsc(struct fsg_dev *fsg, struct fsg_buffhd *bh) fsg->cbbuf_cmnd_size = req->actual; memcpy(fsg->cbbuf_cmnd, req->buf, fsg->cbbuf_cmnd_size); - spin_unlock(&fsg->lock); wakeup_thread(fsg); + spin_unlock(&fsg->lock); } #else @@ -1514,8 +1520,8 @@ static int fsg_setup(struct usb_gadget *gadget, /* Use this for bulk or interrupt transfers, not ep0 */ static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, - struct usb_request *req, volatile int *pbusy, - volatile enum fsg_buffer_state *state) + struct usb_request *req, int *pbusy, + enum fsg_buffer_state *state) { int rc; @@ -1523,8 +1529,11 @@ static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, dump_msg(fsg, "bulk-in", req->buf, req->length); else if (ep == fsg->intr_in) dump_msg(fsg, "intr-in", req->buf, req->length); + + spin_lock_irq(&fsg->lock); *pbusy = 1; *state = BUF_STATE_BUSY; + spin_unlock_irq(&fsg->lock); rc = usb_ep_queue(ep, req, GFP_KERNEL); if (rc != 0) { *pbusy = 0; @@ -1544,14 +1553,23 @@ static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep, static int sleep_thread(struct fsg_dev *fsg) { - int rc; + int rc = 0; /* Wait until a signal arrives or we are woken up */ - rc = wait_event_interruptible(fsg->thread_wqh, - fsg->thread_wakeup_needed); + for (;;) { + try_to_freeze(); + set_current_state(TASK_INTERRUPTIBLE); + if (signal_pending(current)) { + rc = -EINTR; + break; + } + if (fsg->thread_wakeup_needed) + break; + schedule(); + } + __set_current_state(TASK_RUNNING); fsg->thread_wakeup_needed = 0; - try_to_freeze(); - return (rc ? -EINTR : 0); + return rc; } @@ -1788,6 +1806,7 @@ static int do_write(struct fsg_dev *fsg) if (bh->state == BUF_STATE_EMPTY && !get_some_more) break; // We stopped early if (bh->state == BUF_STATE_FULL) { + smp_rmb(); fsg->next_buffhd_to_drain = bh->next; bh->state = BUF_STATE_EMPTY; @@ -2356,6 +2375,7 @@ static int throw_away_data(struct fsg_dev *fsg) /* Throw away the data in a filled buffer */ if (bh->state == BUF_STATE_FULL) { + smp_rmb(); bh->state = BUF_STATE_EMPTY; fsg->next_buffhd_to_drain = bh->next; @@ -3021,6 +3041,7 @@ static int get_next_command(struct fsg_dev *fsg) if ((rc = sleep_thread(fsg)) != 0) return rc; } + smp_rmb(); rc = received_cbw(fsg, bh); bh->state = BUF_STATE_EMPTY; @@ -3642,11 +3663,19 @@ static DEVICE_ATTR(file, 0444, show_file, NULL); /*-------------------------------------------------------------------------*/ +static void fsg_release(struct kref *ref) +{ + struct fsg_dev *fsg = container_of(ref, struct fsg_dev, ref); + + kfree(fsg->luns); + kfree(fsg); +} + static void lun_release(struct device *dev) { struct fsg_dev *fsg = (struct fsg_dev *) dev_get_drvdata(dev); - complete(&fsg->lun_released); + kref_put(&fsg->ref, fsg_release); } static void fsg_unbind(struct usb_gadget *gadget) @@ -3660,14 +3689,12 @@ static void fsg_unbind(struct usb_gadget *gadget) clear_bit(REGISTERED, &fsg->atomic_bitflags); /* Unregister the sysfs attribute files and the LUNs */ - init_completion(&fsg->lun_released); for (i = 0; i < fsg->nluns; ++i) { curlun = &fsg->luns[i]; if (curlun->registered) { device_remove_file(&curlun->dev, &dev_attr_ro); device_remove_file(&curlun->dev, &dev_attr_file); device_unregister(&curlun->dev); - wait_for_completion(&fsg->lun_released); curlun->registered = 0; } } @@ -3846,6 +3873,7 @@ static int __init fsg_bind(struct usb_gadget *gadget) curlun->dev.release = lun_release; device_create_file(&curlun->dev, &dev_attr_ro); device_create_file(&curlun->dev, &dev_attr_file); + kref_get(&fsg->ref); } if (file[i] && *file[i]) { @@ -4061,7 +4089,7 @@ static int __init fsg_alloc(void) return -ENOMEM; spin_lock_init(&fsg->lock); init_rwsem(&fsg->filesem); - init_waitqueue_head(&fsg->thread_wqh); + kref_init(&fsg->ref); init_completion(&fsg->thread_notifier); the_fsg = fsg; @@ -4069,13 +4097,6 @@ static int __init fsg_alloc(void) } -static void fsg_free(struct fsg_dev *fsg) -{ - kfree(fsg->luns); - kfree(fsg); -} - - static int __init fsg_init(void) { int rc; @@ -4085,7 +4106,7 @@ static int __init fsg_init(void) return rc; fsg = the_fsg; if ((rc = usb_gadget_register_driver(&fsg_driver)) != 0) - fsg_free(fsg); + kref_put(&fsg->ref, fsg_release); return rc; } module_init(fsg_init); @@ -4103,6 +4124,6 @@ static void __exit fsg_cleanup(void) wait_for_completion(&fsg->thread_notifier); close_all_backing_files(fsg); - fsg_free(fsg); + kref_put(&fsg->ref, fsg_release); } module_exit(fsg_cleanup); diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c index b35ac6d..65e084a 100644 --- a/drivers/usb/gadget/serial.c +++ b/drivers/usb/gadget/serial.c @@ -890,10 +890,12 @@ static void gs_close(struct tty_struct *tty, struct file *file) /* wait for write buffer to drain, or */ /* at most GS_CLOSE_TIMEOUT seconds */ if (gs_buf_data_avail(port->port_write_buf) > 0) { + spin_unlock_irqrestore(&port->port_lock, flags); wait_cond_interruptible_timeout(port->port_write_wait, port->port_dev == NULL || gs_buf_data_avail(port->port_write_buf) == 0, &port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ); + spin_lock_irqsave(&port->port_lock, flags); } /* free disconnected port on final close */ |