Fix for bug in mbox_read. Thanks lp0

Author: popcornmix

arch/arm/mach-bcm2708/power.c

@@ -97,8 +97,6 @@ int bcm_power_request(BCM_POWER_HANDLE_T handle, uint32_t request)
 				bcm_mailbox_write(MBOX_CHAN_POWER,
 						  global_request << 4);
 
-				/* Wait for a response during power-up */
-				mdelay(10);
 				if (global_request & ~g_state.global_request) {
 					rc = bcm_mailbox_read(MBOX_CHAN_POWER,
 							      &actual);

arch/arm/mach-bcm2708/vcio.c

@@ -119,8 +119,7 @@ static int mbox_read(struct vc_mailbox *mbox, unsigned chan, uint32_t *data28)
 	if (mbox->magic != MBOX_MAGIC)
 		rc = -EINVAL;
 	else {
-		if (mbox->msg[chan] ||
-		    (down_interruptible(&mbox->sema[chan]) == 0)) {
+		if (down_interruptible(&mbox->sema[chan]) == 0) {
 			*data28 = MBOX_DATA28(mbox->msg[chan]);
 			mbox->msg[chan] = 0;
 			rc = 0;

drivers/video/bcm2708_fb.c

@@ -18,7 +18,6 @@
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/slab.h>
-#include <linux/delay.h>
 #include <linux/mm.h>
 #include <linux/fb.h>
 #include <linux/init.h>
@@ -221,8 +220,7 @@ static int bcm2708_fb_set_par(struct fb_info *info)
 	/* inform vc about new framebuffer */
 	bcm_mailbox_write(MBOX_CHAN_FB, fb->dma);
 
-	/* workaround occasional failure to read results. TODO: replace fb driver with vchiq version */
-	msleep(10);
+	/* TODO: replace fb driver with vchiq version */
 	/* wait for response */
 	bcm_mailbox_read(MBOX_CHAN_FB, &val);