From: Karsten Graul <kgraul@linux.ibm.com>
Date: Wed, 14 Oct 2020 17:43:28 +0000 (+0200)
Subject: net/smc: fix valid DMBE buffer sizes
X-Git-Tag: v5.8.17~619
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=91119131f8a8e96816e746a4e2d4b6d3b3bd1faf;p=thirdparty%2Fkernel%2Fstable.git

net/smc: fix valid DMBE buffer sizes

[ Upstream commit ef12ad45880b696eb993d86c481ca891836ab593 ]

The SMCD_DMBE_SIZES should include all valid DMBE buffer sizes, so the
correct value is 6 which means 1MB. With 7 the registration of an ISM
buffer would always fail because of the invalid size requested.
Fix that and set the value to 6.

Fixes: c6ba7c9ba43d ("net/smc: add base infrastructure for SMC-D and ISM")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index f82a2e5999171..49696f464794f 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1595,7 +1595,7 @@ out:
 	return rc;
 }
 
-#define SMCD_DMBE_SIZES		7 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
+#define SMCD_DMBE_SIZES		6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
 
 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
 						bool is_dmb, int bufsize)