From: Pierre Ossman <drzeus@drzeus.cx>
Date: Sun, 22 Jul 2007 15:52:06 +0000 (+0200)
Subject: mmc: Don't hold lock when releasing an added card
X-Git-Tag: firefly_0821_release~27070^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2986d0bf23d97d68804ccfa80965073ccf1af242;p=firefly-linux-kernel-4.4.55.git

mmc: Don't hold lock when releasing an added card

When the card has been added to the device model, it might be bound
to a card driver. Therefore, we have to release the host lock when
trying to remove it as we otherwise might deadlock with the driver.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
---

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 1a889e9c5316..cd0c6b246fed 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -499,14 +499,17 @@ static void mmc_resume(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
-
 	err = mmc_init_card(host, host->ocr, host->card);
+	mmc_release_host(host);
+
 	if (err != MMC_ERR_NONE) {
 		mmc_remove(host);
+
+		mmc_claim_host(host);
 		mmc_detach_bus(host);
+		mmc_release_host(host);
 	}
 
-	mmc_release_host(host);
 }
 
 #else
@@ -567,14 +570,14 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 
 	err = mmc_add_card(host->card);
 	if (err)
-		goto reclaim_host;
+		goto remove_card;
 
 	return 0;
 
-reclaim_host:
-	mmc_claim_host(host);
+remove_card:
 	mmc_remove_card(host->card);
 	host->card = NULL;
+	mmc_claim_host(host);
 err:
 	mmc_detach_bus(host);
 	mmc_release_host(host);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index df3bbfea2269..0b478de48acc 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -573,14 +573,17 @@ static void mmc_sd_resume(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
-
 	err = mmc_sd_init_card(host, host->ocr, host->card);
+	mmc_release_host(host);
+
 	if (err != MMC_ERR_NONE) {
 		mmc_sd_remove(host);
+
+		mmc_claim_host(host);
 		mmc_detach_bus(host);
+		mmc_release_host(host);
 	}
 
-	mmc_release_host(host);
 }
 
 #else
@@ -648,14 +651,14 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 
 	err = mmc_add_card(host->card);
 	if (err)
-		goto reclaim_host;
+		goto remove_card;
 
 	return 0;
 
-reclaim_host:
-	mmc_claim_host(host);
+remove_card:
 	mmc_remove_card(host->card);
 	host->card = NULL;
+	mmc_claim_host(host);
 err:
 	mmc_detach_bus(host);
 	mmc_release_host(host);