From 47104b0dd32cec467574822b0dc3517b3de3f0ad Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 1 Jun 2006 13:52:56 -0400 Subject: [PATCH] usb-storage: use usb_reset_composite_device This patch (as701) modifies usb-storage to take advantage of the new usb_reset_composite_device() API. Now we will be able to safely request port resets even if other drivers are bound to a mass-storage device. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/transport.c | 50 +++++++++++++++++++++-------------------- 1 file changed, 26 insertions(+), 24 deletions(-) (limited to 'drivers/usb/storage/transport.c') diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c index 038f4582ca0b..19b25c5cafd4 100644 --- a/drivers/usb/storage/transport.c +++ b/drivers/usb/storage/transport.c @@ -703,16 +703,19 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) * device reset. */ Handle_Errors: - /* Let the SCSI layer know we are doing a reset, set the - * RESETTING bit, and clear the ABORTING bit so that the reset - * may proceed. */ + /* Set the RESETTING bit, and clear the ABORTING bit so that + * the reset may proceed. */ scsi_lock(us_to_host(us)); - usb_stor_report_bus_reset(us); set_bit(US_FLIDX_RESETTING, &us->flags); clear_bit(US_FLIDX_ABORTING, &us->flags); scsi_unlock(us_to_host(us)); + /* We must release the device lock because the pre_reset routine + * will want to acquire it. */ + mutex_unlock(&us->dev_mutex); result = usb_stor_port_reset(us); + mutex_lock(&us->dev_mutex); + if (result < 0) { scsi_lock(us_to_host(us)); usb_stor_report_device_reset(us); @@ -1196,31 +1199,30 @@ int usb_stor_Bulk_reset(struct us_data *us) 0, us->ifnum, NULL, 0); } -/* Issue a USB port reset to the device. But don't do anything if - * there's more than one interface in the device, so that other users - * are not affected. */ +/* Issue a USB port reset to the device. The caller must not hold + * us->dev_mutex. + */ int usb_stor_port_reset(struct us_data *us) { - int result, rc; + int result, rc_lock; - if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { - result = -EIO; - US_DEBUGP("No reset during disconnect\n"); - } else if (us->pusb_dev->actconfig->desc.bNumInterfaces != 1) { - result = -EBUSY; - US_DEBUGP("Refusing to reset a multi-interface device\n"); - } else { - result = rc = - usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); - if (result < 0) { - US_DEBUGP("unable to lock device for reset: %d\n", - result); + result = rc_lock = + usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); + if (result < 0) + US_DEBUGP("unable to lock device for reset: %d\n", result); + else { + /* Were we disconnected while waiting for the lock? */ + if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { + result = -EIO; + US_DEBUGP("No reset during disconnect\n"); } else { - result = usb_reset_device(us->pusb_dev); - if (rc) - usb_unlock_device(us->pusb_dev); - US_DEBUGP("usb_reset_device returns %d\n", result); + result = usb_reset_composite_device( + us->pusb_dev, us->pusb_intf); + US_DEBUGP("usb_reset_composite_device returns %d\n", + result); } + if (rc_lock) + usb_unlock_device(us->pusb_dev); } return result; } -- cgit v1.2.3