diff options
| author |   Oliver Neukum <oliver@neukum.org> | 2009-12-18 12:14:21 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-02 14:53:23 -0800 |
| commit | 5d3987796c7a747e5ed3ded1eb64a9632d52a1a4 (patch) | |
| tree | f677d4014bd5e25d1f4ccac1862fd95655baedec | |
| parent | USB: otg: twl4030: add support for notifier (diff) | |
| download | linux-dev-5d3987796c7a747e5ed3ded1eb64a9632d52a1a4.tar.xz linux-dev-5d3987796c7a747e5ed3ded1eb64a9632d52a1a4.zip | |
USB: storage: Never reset devices that will morph to an old mode
Some devices must be switched to a new mode to fully use them.
A reset would make them revert to the old mode. Therefore a reset
must not be used for error handling with such devices.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/core/quirks.c | 3 | ||||
| -rw-r--r-- | drivers/usb/storage/transport.c | 6 | ||||
| -rw-r--r-- | include/linux/usb/quirks.h | 3 |
3 files changed, 11 insertions, 1 deletions
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index ab93918d9207..0b689224394b 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -120,6 +120,7 @@ void usb_detect_quirks(struct usb_device *udev) * for all devices. It will affect things like hub resets * and EMF-related port disables. */ - udev->persist_enabled = 1; + if (!(udev->quirks & USB_QUIRK_RESET_MORPHS)) + udev->persist_enabled = 1; #endif /* CONFIG_PM */ } diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c index cc313d16d727..468038126e5e 100644 --- a/drivers/usb/storage/transport.c +++ b/drivers/usb/storage/transport.c @@ -47,6 +47,8 @@ #include <linux/errno.h> #include <linux/slab.h> +#include <linux/usb/quirks.h> + #include <scsi/scsi.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_device.h> @@ -1297,6 +1299,10 @@ int usb_stor_port_reset(struct us_data *us) { int result; + /*for these devices we must use the class specific method */ + if (us->pusb_dev->quirks & USB_QUIRK_RESET_MORPHS) + return -EPERM; + result = 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); diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 2526f3bbd273..0a555dd131fc 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -19,4 +19,7 @@ /* device can't handle its Configuration or Interface strings */ #define USB_QUIRK_CONFIG_INTF_STRINGS 0x00000008 +/*device will morph if reset, don't use reset for handling errors */ +#define USB_QUIRK_RESET_MORPHS 0x00000010 + #endif /* __LINUX_USB_QUIRKS_H */ |