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From:   Christian Eggers <ceggers@arri.de>
To:     Sean Anderson <sean.anderson@seco.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
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        <linux-crypto@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <ceggers@arri.de>
Subject: PROBLEM: encryption test failures since "crypto: mxs-dcp - Use sg_mapping_iter to copy data"
Date:   Thu, 27 Jan 2022 18:23:13 +0100
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SoC: i.MX6ULL

After upgrading from v5.10.65-rt53 to v5.10.73-rt54 I get two additional messages on boot:

...
[    3.786333] alg: skcipher: ecb-aes-dcp encryption test failed (wrong result) on test vector 0, cfg="two even aligned splits"
[    3.789020] alg: skcipher: cbc-aes-dcp encryption test failed (wrong result) on test vector 0, cfg="two even aligned splits"
[    3.793741] mxs-dcp 2280000.crypto: mxs_dcp: initialized
..

After reverting the commit

2e6d793e1bf0 ("crypto: mxs-dcp - Use sg_mapping_iter to copy data")

the error messages above disappear again.

regards
Christian

[3.] Keywords: mxc-dcp, crypto manager self tests
[4.] Kernel information
[4.1.] Kernel version (from /proc/version):
Linux version 5.10.73-rt54+ (eggers@localhost.localdomain) (arm-poky-linux-gnueabi-gcc (GCC) 10.2.0, GNU ld (GNU Binutils) 2.35.1) #19 PREEMPT_RT Thu Jan 27 17:56:20 CET 2022

[4.2.] Kernel .config file:
[5.] Most recent kernel version which did not have the bug: 5.10.65-rt53
[8.] Environment
[8.1.] Software (add the output of the ver_linux script here)
n/a (embedded system, kernel cross compiled)

[8.2.] Processor information (from /proc/cpuinfo):
processor       : 0
model name      : ARMv7 Processor rev 5 (v7l)
BogoMIPS        : 16.00
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xc07
CPU revision    : 5

Hardware        : Freescale i.MX6 Ultralite (Device Tree)
Revision        : 0000
Serial          : 0000000000000000