From: Sergey Senozhatsky <senozhatsky@chromium.org>
Date: Fri, 24 Jun 2022 06:06:06 +0000 (+0900)
Subject: zram: do not lookup algorithm in backends table
X-Git-Tag: maple_v12_fixes~29
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f526deb6dbeab7fdb53e7e6b9033899a4f118bae;p=users%2Fjedix%2Flinux-maple.git

zram: do not lookup algorithm in backends table

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Link: https://lkml.kernel.org/r/20220624060606.1014474-1-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 398eb9e24eff..0916de952e09 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -211,6 +211,11 @@ struct zcomp *zcomp_create(const char *compress)
 	struct zcomp *comp;
 	int error;
 
+	/*
+	 * Crypto API will execute /sbin/modprobe if the compression module
+	 * is not loaded yet. We must do it here, otherwise we are about to
+	 * call /sbin/modprobe under CPU hot-plug lock.
+	 */
 	if (!zcomp_available_algorithm(compress))
 		return ERR_PTR(-EINVAL);