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USB: make usb_buffer_map_sg consistent with doc 

usb_buffer_map_sg should return negative on error according to
its documentation. But dma_map_sg returns 0 on error. Take this
into account and return -ENOMEM in such situation.

While at it, return -EINVAL instead of -1 when wrong input is
passed in.

If this wasn't done, usb_sg_* operations used after usb_sg_init
which returned 0 may cause oopses/deadlocks since we don't init
structures/entries, esp. completion and status entry.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2009-08-22 20:24:49 +02:00 committed by Greg Kroah-Hartman
parent a448c9d8c5
commit 2912282c06
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/core/usb.c
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@ -914,11 +914,11 @@ int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
|| !(bus = dev->bus)
|| !(controller = bus->controller)
|| !controller->dma_mask)
return -1;
return -EINVAL;
/* FIXME generic api broken like pci, can't report errors */
return dma_map_sg(controller, sg, nents,
is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM;
}
EXPORT_SYMBOL_GPL(usb_buffer_map_sg);