USB: pxa27x_udc: avoid compiler warnings and misbehavior on buggy hardware
hardware reports wrong interrupt. Although such a situation should not
happen, the compiler complains about this access.
This patch adds a sanity check and generates warning to detect such
issues.
Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index adda120..d4c6eec 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -2218,9 +2218,13 @@
continue;
udc_writel(udc, UDCISR0, UDCISR_INT(i, UDCISR_INT_MASK));
- ep = &udc->pxa_ep[i];
- ep->stats.irqs++;
- handle_ep(ep);
+
+ WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
+ if (i < ARRAY_SIZE(udc->pxa_ep)) {
+ ep = &udc->pxa_ep[i];
+ ep->stats.irqs++;
+ handle_ep(ep);
+ }
}
for (i = 16; udcisr1 != 0 && i < 24; udcisr1 >>= 2, i++) {
@@ -2228,9 +2232,12 @@
if (!(udcisr1 & UDCISR_INT_MASK))
continue;
- ep = &udc->pxa_ep[i];
- ep->stats.irqs++;
- handle_ep(ep);
+ WARN_ON(i >= ARRAY_SIZE(udc->pxa_ep));
+ if (i < ARRAY_SIZE(udc->pxa_ep)) {
+ ep = &udc->pxa_ep[i];
+ ep->stats.irqs++;
+ handle_ep(ep);
+ }
}
}