+ zram-return-early-on-error-in-zram_bvec_rw.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: zram: return early on error in zram_bvec_rw
has been added to the -mm mm-unstable branch.  Its filename is
     zram-return-early-on-error-in-zram_bvec_rw.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-return-early-on-error-in-zram_bvec_rw.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: zram: return early on error in zram_bvec_rw
Date: Tue, 11 Apr 2023 19:14:48 +0200

When the low-level access fails, don't clear the idle flag or clear the
caches, and just return.

Link: https://lkml.kernel.org/r/20230411171459.567614-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/block/zram/zram_drv.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/block/zram/zram_drv.c~zram-return-early-on-error-in-zram_bvec_rw
+++ a/drivers/block/zram/zram_drv.c
@@ -1933,23 +1933,23 @@ static int zram_bvec_rw(struct zram *zra
 
 	if (!op_is_write(op)) {
 		ret = zram_bvec_read(zram, bvec, index, offset, bio);
+		if (unlikely(ret < 0)) {
+			atomic64_inc(&zram->stats.failed_reads);
+			return ret;
+		}
 		flush_dcache_page(bvec->bv_page);
 	} else {
 		ret = zram_bvec_write(zram, bvec, index, offset, bio);
+		if (unlikely(ret < 0)) {
+			atomic64_inc(&zram->stats.failed_writes);
+			return ret;
+		}
 	}
 
 	zram_slot_lock(zram, index);
 	zram_accessed(zram, index);
 	zram_slot_unlock(zram, index);
-
-	if (unlikely(ret < 0)) {
-		if (!op_is_write(op))
-			atomic64_inc(&zram->stats.failed_reads);
-		else
-			atomic64_inc(&zram->stats.failed_writes);
-	}
-
-	return ret;
+	return 0;
 }
 
 static void __zram_make_request(struct zram *zram, struct bio *bio)
_

Patches currently in -mm which might be from hch@lst.de are

zram-always-compile-read_from_bdev_sync.patch
zram-remove-valid_io_request.patch
zram-make-zram_bio_discard-more-self-contained.patch
zram-simplify-bvec-iteration-in-__zram_make_request.patch
zram-move-discard-handling-to-zram_submit_bio.patch
zram-return-early-on-error-in-zram_bvec_rw.patch
zram-refactor-highlevel-read-and-write-handling.patch
zram-dont-use-highmem-for-the-bounce-buffer-in-zram_bvec_readwrite.patch
zram-rename-__zram_bvec_read-to-zram_read_page.patch
zram-directly-call-zram_read_page-in-writeback_store.patch
zram-refactor-zram_bdev_read.patch
zram-dont-pass-a-bvec-to-__zram_bvec_write.patch
zram-refactor-zram_bdev_write.patch
zram-pass-a-page-to-read_from_bdev.patch
zram-dont-return-errors-from-read_from_bdev_async.patch
zram-fix-synchronous-reads.patch
zram-return-errors-from-read_from_bdev_sync.patch