linux-kernel - [PATCH AUTOSEL 4.4 5/6] usb: gadget: udc: lpc32xx: allocate descriptor with GFP

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Message-Id: <20190626034637.24515-5-sashal@kernel.org>
Date:   Tue, 25 Jun 2019 23:46:36 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        James Grant <jamesg@...tys.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 5/6] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

[ 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@...il.com>
Tested-by: James Grant <jamesg@...tys.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/udc/lpc32xx_udc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
index 00b5006baf15..90d24f62bd81 100644
--- a/drivers/usb/gadget/udc/lpc32xx_udc.c
+++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
@@ -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;
 
-- 
2.20.1