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usb/hcd: Fix dma_map_sg error check 

dma_map_sg return 0 on error.

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Alexey Sheplyakov <asheplyakov@basealt.ru>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20220819060801.10443-7-jinpu.wang@ionos.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jack Wang 2022-08-19 08:07:48 +02:00 committed by Greg Kroah-Hartman
parent a88520bfc0
commit 4dce3b3751
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/core/hcd.c
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@ -1474,7 +1474,7 @@ int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
urb->sg, urb->sg,
urb->num_sgs, urb->num_sgs,
dir); dir);
if (n <= 0) if (!n)
ret = -EAGAIN; ret = -EAGAIN;
else else
urb->transfer_flags |= URB_DMA_MAP_SG; urb->transfer_flags |= URB_DMA_MAP_SG;