linux-kernel - [<PATCH v1> 9/9] mmc: sd: Fix trivial SD card issues

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Date:   Mon, 16 Dec 2019 18:50:42 -0800
From:   "Bao D. Nguyen" <nguyenb@...eaurora.org>
To:     ulf.hansson@...aro.org, robh+dt@...nel.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        asutoshd@...eaurora.org, cang@...eaurora.org,
        "Bao D. Nguyen" <nguyenb@...cinc.com>,
        "Bao D. Nguyen" <nguyenb@...eaurora.org>
Subject: [<PATCH v1> 9/9] mmc: sd: Fix trivial SD card issues

From: "Bao D. Nguyen" <nguyenb@...cinc.com>

Fix various trivial SD card issues.

Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
---
 drivers/mmc/core/block.c |  4 ++--
 drivers/mmc/core/bus.c   | 13 +++++++++++++
 drivers/mmc/core/core.c  | 13 ++++++++-----
 drivers/mmc/core/sd.c    |  9 ++++++---
 4 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 95b41c0..200882d 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -653,13 +653,13 @@ static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
 	struct request *req;
 
 	idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
-	if (IS_ERR(idata))
+	if (IS_ERR_OR_NULL(idata))
 		return PTR_ERR(idata);
 	/* This will be NULL on non-RPMB ioctl():s */
 	idata->rpmb = rpmb;
 
 	card = md->queue.card;
-	if (IS_ERR(card)) {
+	if (IS_ERR_OR_NULL(card)) {
 		err = PTR_ERR(card);
 		goto cmd_done;
 	}
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 74de3f2..fb17d21 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -131,6 +131,16 @@ static void mmc_bus_shutdown(struct device *dev)
 	struct mmc_host *host = card->host;
 	int ret;
 
+	if (!drv) {
+		pr_debug("%s: %s: drv is NULL\n", dev_name(dev), __func__);
+		return;
+	}
+
+	if (!card) {
+		pr_debug("%s: %s: card is NULL\n", dev_name(dev), __func__);
+		return;
+	}
+
 	if (dev->driver && drv->shutdown)
 		drv->shutdown(card);
 
@@ -247,12 +257,15 @@ void mmc_unregister_driver(struct mmc_driver *drv)
 static void mmc_release_card(struct device *dev)
 {
 	struct mmc_card *card = mmc_dev_to_card(dev);
+	struct mmc_host *host = card->host;
 
 	sdio_free_common_cis(card);
 
 	kfree(card->info);
 
 	kfree(card);
+	if (host)
+		host->card = NULL;
 }
 
 /*
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 38b0cec..13d496e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -399,7 +399,7 @@ void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
 	struct mmc_command *cmd;
 
 	while (1) {
-		wait_for_completion(&mrq->completion);
+		wait_for_completion_io(&mrq->completion);
 
 		cmd = mrq->cmd;
 
@@ -666,6 +666,10 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 {
 	unsigned int mult;
 
+	if (!card) {
+		WARN_ON(1);
+		return;
+	}
 	/*
 	 * SDIO cards only define an upper 1 s limit on access.
 	 */
@@ -2341,17 +2345,16 @@ void mmc_rescan(struct work_struct *work)
 
 void mmc_start_host(struct mmc_host *host)
 {
+	mmc_claim_host(host);
 	host->f_init = max(freqs[0], host->f_min);
 	host->rescan_disable = 0;
 	host->ios.power_mode = MMC_POWER_UNDEFINED;
 
-	if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
-		mmc_claim_host(host);
+	if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP))
 		mmc_power_up(host, host->ocr_avail);
-		mmc_release_host(host);
-	}
 
 	mmc_gpiod_request_cd_irq(host);
+	mmc_release_host(host);
 	_mmc_detect_change(host, 0, false);
 }
 
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 5938caf..e163f0e 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -989,6 +989,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		err = mmc_send_relative_addr(host, &card->rca);
 		if (err)
 			goto free_card;
+		host->card = card;
 	}
 
 	if (!oldcard) {
@@ -1090,13 +1091,13 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		goto free_card;
 	}
 done:
-	host->card = card;
 	return 0;
 
 free_card:
-	if (!oldcard)
+	if (!oldcard) {
+		host->card = NULL;
 		mmc_remove_card(card);
-
+	}
 	return err;
 }
 
@@ -1106,7 +1107,9 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 static void mmc_sd_remove(struct mmc_host *host)
 {
 	mmc_remove_card(host->card);
+	mmc_claim_host(host);
 	host->card = NULL;
+	mmc_release_host(host);
 }
 
 /*
-- 
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