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usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC

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[ Upstream commit fbc318afadd6e7ae2252d6158cf7d0c5a2132f7d ]

Gadget drivers may queue request in interrupt context. This would lead to
a descriptor allocation in that context. In that case we would hit
BUG_ON(in_interrupt()) in __get_vm_area_node.

Also remove the unnecessary cast.

Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Tested-by: James Grant <jamesg@zaltys.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandre Belloni 2019-05-22 14:07:36 +02:00 • committed by Greg Kroah-Hartman
parent 53f1c783ec
commit 8978dce0c2
1 changed files with 1 additions and 2 deletions

3
drivers/usb/gadget/udc/lpc32xx_udc.c
View file

@ -964,8 +964,7 @@ static struct lpc32xx_usbd_dd_gad *udc_dd_alloc(struct lpc32xx_udc *udc)
dma_addr_t dma;
struct lpc32xx_usbd_dd_gad *dd;
dd = (struct lpc32xx_usbd_dd_gad *) dma_pool_alloc(
udc->dd_cache, (GFP_KERNEL | GFP_DMA), &dma);
dd = dma_pool_alloc(udc->dd_cache, GFP_ATOMIC | GFP_DMA, &dma);
if (dd)
dd->this_dma = dma;