Hello!
On 24.11.2020 11:49, min.guo@xxxxxxxxxxxx wrote:
From: Min Guo <min.guo@xxxxxxxxxxxx>
Remove unused 'devctl' variable to fix compile warnings:
drivers/usb/musb/musbhsdma.c: In function 'dma_controller_irq':
drivers/usb/musb/musbhsdma.c:324:8: warning: variable 'devctl' set
but not used [-Wunused-but-set-variable]
Signed-off-by: Min Guo <min.guo@xxxxxxxxxxxx>
---
changes in v3
suggested by Greg Kroah-Hartman:
Add a comment.
changes in v2
suggested by Alan Stern:
Add void before musb_read to indicate that the register MUSB_DEVCTL
was intended to be read and discarded.
---
drivers/usb/musb/musbhsdma.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index 0aacfc8be5a1..2a345b4ad015 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
[...]
@@ -336,7 +334,11 @@ irqreturn_t dma_controller_irq(int irq, void *private_data)
< musb_channel->len) ?
"=> reconfig 0" : "=> complete");
- devctl = musb_readb(mbase, MUSB_DEVCTL);
+ /*
+ * Some hardware may need to read the
+ * MUSB_DEVCTL register once to take effect.
+ */
+ (void)musb_readb(mbase, MUSB_DEVCTL);
Hm, forcibly reading DevCtl in the DMA driver... sounds quite
nonsensically. Lemme take a look...
[...]
MBR, Sergei
