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authorArnd Bergmann <arnd@arndb.de>2017-09-07 16:14:31 +0200
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-09-20 13:57:28 +0200
commit7661ca09b2ff98f48693f431bb01fed62830e433 (patch)
treee6df4d7d67bafd490df9a7233c73d750ed13f50c /drivers
parentusb: gadget: udc: fix snps_udc_plat.c build errors (diff)
downloadlinux-7661ca09b2ff98f48693f431bb01fed62830e433.tar.xz
linux-7661ca09b2ff98f48693f431bb01fed62830e433.zip
usb: gadget: dummy: fix nonsensical comparisons
gcc-8 points out two comparisons that are clearly bogus and almost certainly not what the author intended to write: drivers/usb/gadget/udc/dummy_hcd.c: In function 'set_link_state_by_speed': drivers/usb/gadget/udc/dummy_hcd.c:379:31: error: bitwise comparison always evaluates to false [-Werror=tautological-compare] USB_PORT_STAT_ENABLE) == 1 && ^~ drivers/usb/gadget/udc/dummy_hcd.c:381:25: error: bitwise comparison always evaluates to false [-Werror=tautological-compare] USB_SS_PORT_LS_U0) == 1 && ^~ I looked at the code for a bit and came up with a change that makes it look like what the author probably meant here. This makes it look reasonable to me and to gcc, shutting up the warning. It does of course change behavior as the two conditions are actually evaluated rather than being hardcoded to false, and I have made no attempt at verifying that the changed logic makes sense in the context of a USB HCD, so that part needs to be reviewed carefully. Fixes: 1cd8fd2887e1 ("usb: gadget: dummy_hcd: add SuperSpeed support") Cc: Tatyana Brokhman <tlinder@codeaurora.org> Cc: Felipe Balbi <balbi@kernel.org> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/gadget/udc/dummy_hcd.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index a030d7923d7d..b1e21b3be6e1 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -375,11 +375,10 @@ static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
USB_PORT_STAT_CONNECTION) == 0)
dum_hcd->port_status |=
(USB_PORT_STAT_C_CONNECTION << 16);
- if ((dum_hcd->port_status &
- USB_PORT_STAT_ENABLE) == 1 &&
- (dum_hcd->port_status &
- USB_SS_PORT_LS_U0) == 1 &&
- dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
+ if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) &&
+ (dum_hcd->port_status &
+ USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 &&
+ dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
dum_hcd->active = 1;
}
} else {