From 2912282c06f219cf1634a624653c445329b37acf Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Sat, 22 Aug 2009 20:24:49 +0200 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/usb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 43ee943d757a..30dd2636f262 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -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); -- cgit v1.2.3