usb: renesas: fix scheduling in atomic context bug

The current renesas_usbhs driver triggers

BUG: scheduling while atomic: ksoftirqd/0/3/0x00000102

with enabled CONFIG_DEBUG_ATOMIC_SLEEP, by submitting DMA transfers from
an atomic (tasklet) context, which is not supported by the shdma dmaengine
driver. Fix it by switching to a work.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/renesas_usbhs/fifo.h b/drivers/usb/renesas_usbhs/fifo.h
index f68609c0f489..c31731a843d1 100644
--- a/drivers/usb/renesas_usbhs/fifo.h
+++ b/drivers/usb/renesas_usbhs/fifo.h
@@ -19,6 +19,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/sh_dma.h>
+#include <linux/workqueue.h>
 #include <asm/dma.h>
 #include "pipe.h"
 
@@ -31,7 +32,6 @@ struct usbhs_fifo {
         u32 ctr;        /* xFIFOCTR */
 
         struct usbhs_pipe       *pipe;
-        struct tasklet_struct   tasklet;
 
         struct dma_chan         *tx_chan;
         struct dma_chan         *rx_chan;
@@ -53,6 +53,7 @@ struct usbhs_pkt {
         struct usbhs_pkt_handle *handler;
         void (*done)(struct usbhs_priv *priv,
                      struct usbhs_pkt *pkt);
+        struct work_struct work;
         dma_addr_t dma;
         void *buf;
         int length;