omap hsmmc: fix a racing case between kmmcd and omap_hsmmc_suspend

If suspend called when kmmcd is doing host->ops->disable, as kmmcd already
increased host->en_dis_recurs to 1, the mmc_host_enable in suspend
function will return directly without increase the nesting_cnt, which will
cause the followed register access carried out to the disabled host.

mmc_suspend_host will enable host itself. No need to enable host before
it. Also works on kmmcd will get flushed in mmc_suspend_host, enable host
after it will be safe. So make the mmc_host_enable after it.

[cjb: rebase against current Linus]
Signed-off-by: Ethan <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Acked-by: Madhusudhan Chikkature <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/mmc/host/omap_hsmmc.c

···
 			}
 		}
 		cancel_work_sync(&host->mmc_carddetect_work);
-		mmc_host_enable(host->mmc);
 		ret = mmc_suspend_host(host->mmc);
+		mmc_host_enable(host->mmc);
 		if (ret == 0) {
 			omap_hsmmc_disable_irq(host);
 			OMAP_HSMMC_WRITE(host->base, HCTL,