Patch "mmc: sdhci: Avoid swiotlb buffer being full" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    mmc: sdhci: Avoid swiotlb buffer being full

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mmc-sdhci-avoid-swiotlb-buffer-being-full.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 250dcd11466e06df64b92520e2c56bdae453581b Mon Sep 17 00:00:00 2001
From: Ulf Hansson <ulf.hansson@linaro.org>
Date: Mon, 27 Nov 2017 11:28:50 +0100
Subject: mmc: sdhci: Avoid swiotlb buffer being full

From: Ulf Hansson <ulf.hansson@linaro.org>

commit 250dcd11466e06df64b92520e2c56bdae453581b upstream.

The commit de3ee99b097d ("mmc: Delete bounce buffer handling") deletes the
bounce buffer handling, but also causes the max_req_size for sdhci to be
increased, in case when max_segs == 1. This causes errors for sdhci-pci
Ricoh variant, about the swiotlb buffer to become full.

Fix the issue, by taking IO_TLB_SEGSIZE and IO_TLB_SHIFT into account when
deciding the max_req_size for sdhci.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Fixes: de3ee99b097d ("mmc: Delete bounce buffer handling")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mmc/host/sdhci.c |   28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -21,6 +21,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/scatterlist.h>
+#include <linux/swiotlb.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
@@ -3651,22 +3652,29 @@ int sdhci_setup_host(struct sdhci_host *
 	spin_lock_init(&host->lock);
 
 	/*
+	 * Maximum number of sectors in one transfer. Limited by SDMA boundary
+	 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
+	 * is less anyway.
+	 */
+	mmc->max_req_size = 524288;
+
+	/*
 	 * Maximum number of segments. Depends on if the hardware
 	 * can do scatter/gather or not.
 	 */
-	if (host->flags & SDHCI_USE_ADMA)
+	if (host->flags & SDHCI_USE_ADMA) {
 		mmc->max_segs = SDHCI_MAX_SEGS;
-	else if (host->flags & SDHCI_USE_SDMA)
+	} else if (host->flags & SDHCI_USE_SDMA) {
 		mmc->max_segs = 1;
-	else /* PIO */
+		if (swiotlb_max_segment()) {
+			unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
+						IO_TLB_SEGSIZE;
+			mmc->max_req_size = min(mmc->max_req_size,
+						max_req_size);
+		}
+	} else { /* PIO */
 		mmc->max_segs = SDHCI_MAX_SEGS;
-
-	/*
-	 * Maximum number of sectors in one transfer. Limited by SDMA boundary
-	 * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
-	 * is less anyway.
-	 */
-	mmc->max_req_size = 524288;
+	}
 
 	/*
 	 * Maximum segment size. Could be one segment with the maximum number


Patches currently in stable-queue which might be from ulf.hansson@linaro.org are

queue-4.14/mmc-block-check-return-value-of-blk_get_request.patch
queue-4.14/mmc-block-fix-missing-blk_put_request.patch
queue-4.14/mmc-block-ensure-that-debugfs-files-are-removed.patch
queue-4.14/mmc-core-do-not-leave-the-block-driver-in-a-suspended-state.patch
queue-4.14/mmc-core-prepend-0x-to-ocr-entry-in-sysfs.patch
queue-4.14/mmc-sdhci-avoid-swiotlb-buffer-being-full.patch
queue-4.14/mmc-core-prepend-0x-to-pre_eol_info-entry-in-sysfs.patch