mmc: use lock instead of claim in debug check
As mmc_detect_change() can be called from irq context, using
claim (which can sleep) is inherently unsafe. Use the host
spinlock instead, which also is faster.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 72c7cf4..b6c1670 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -500,9 +500,10 @@
void mmc_detect_change(struct mmc_host *host, unsigned long delay)
{
#ifdef CONFIG_MMC_DEBUG
- mmc_claim_host(host);
+ unsigned long flags;
+ spin_lock_irqsave(host->lock, flags);
BUG_ON(host->removed);
- mmc_release_host(host);
+ spin_unlock_irqrestore(host->lock, flags);
#endif
mmc_schedule_delayed_work(&host->detect, delay);
@@ -625,9 +626,10 @@
void mmc_remove_host(struct mmc_host *host)
{
#ifdef CONFIG_MMC_DEBUG
- mmc_claim_host(host);
+ unsigned long flags;
+ spin_lock_irqsave(&host->lock, flags);
host->removed = 1;
- mmc_release_host(host);
+ spin_unlock_irqrestore(&host->lock, flags);
#endif
mmc_flush_scheduled_work();