Add test vector params for NIST P384, add test vector for
NIST P384 on vector of tests.

Vector param from:
https://datatracker.ietf.org/doc/html/rfc5903#section-3.1Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Add ecdh_nist_p384_init_tfm and register and unregister P384 tfm.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

NIST P192 is not unregistered if failed to register NIST P256,
actually it need to unregister the algorithms already registered.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Add a comment that p192 will fail to register in FIPS mode.

Fix ecdh-nist-p192's entry in testmgr by removing the ifdefs
and not setting fips_allowed.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

If Kunpeng 920 enabled the sva mode, the "qm alg register" process will
return directly. So the list of VF wasn't added to QM list.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Add print information necessary if not use hardware crypto algs.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Eliminate the follow smatch warning:

drivers/crypto/qce/aead.c:85 qce_aead_done() warn: inconsistent
indenting.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fix typo '@workmem' -> '@wmem'.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

There is no maintainer for Qualcomm crypto drivers and we are seeing more
development in this area. Add myself as the maintainer so that I can help
in reviewing the changes submitted to these drivers.
Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Use the sg count returned by dma_map_sg to call into
dmaengine_prep_slave_sg rather than using the original sg count. dma_map_sg
can merge consecutive sglist entries, thus making the original sg count
wrong. This is a fix for memory coruption issues observed while testing
encryption/decryption of large messages using libkcapi framework.

Patch has been tested further by running full suite of tcrypt.ko tests
including fuzz tests.
Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The default DRBG is the one that has the highest priority. The priority
is defined based on the order of the list drbg_cores[] where the highest
priority is given to the last entry by drbg_fill_array.

With this patch the default DRBG is switched from HMAC SHA256 to HMAC
SHA512 to support compliance with SP800-90B and SP800-90C (current
draft).

The user of the crypto API is completely unaffected by the change.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Acked-by: simo Sorce <simo@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Use DEVICE_ATTR_RW()/DEVICE_ATTR_RO() helper instead of
plain DEVICE_ATTR, which makes the code a bit shorter and
easier to read.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fill some of the recently freed up slots in tcrypt with xxhash64 and
blake2b/blake2s, so we can easily benchmark their kernel implementations
from user space.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fixes the following W=1 kernel build warning(s):

 drivers/crypto/ccp/ccp-dev.c:476: warning: Function parameter or member 'sp' not described in 'ccp_alloc_struct'
 drivers/crypto/ccp/ccp-dev.c:476: warning: Excess function parameter 'dev' description in 'ccp_alloc_struct'
 drivers/crypto/ccp/ccp-dev.c:476: warning: Function parameter or member 'sp' not described in 'ccp_alloc_struct'
 drivers/crypto/ccp/ccp-dev.c:476: warning: Excess function parameter 'dev' description in 'ccp_alloc_struct'

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: John Allen <john.allen@amd.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Gary R Hook <gary.hook@amd.com>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fixes the following W=1 kernel build warning(s):

 drivers/crypto/nx/nx-aes-gcm.c:26: warning: Function parameter or member 'tfm' not described in 'gcm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-gcm.c:26: warning: Function parameter or member 'in_key' not described in 'gcm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-gcm.c:26: warning: Function parameter or member 'key_len' not described in 'gcm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-gcm.c:26: warning: expecting prototype for Nest Accelerators driver(). Prototype was for gcm_aes_nx_set_key() instead
 drivers/crypto/nx/nx-aes-ecb.c:24: warning: Function parameter or member 'tfm' not described in 'ecb_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ecb.c:24: warning: Function parameter or member 'in_key' not described in 'ecb_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ecb.c:24: warning: Function parameter or member 'key_len' not described in 'ecb_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ecb.c:24: warning: expecting prototype for Nest Accelerators driver(). Prototype was for ecb_aes_nx_set_key() instead
 drivers/crypto/nx/nx-aes-ccm.c:26: warning: Function parameter or member 'tfm' not described in 'ccm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ccm.c:26: warning: Function parameter or member 'in_key' not described in 'ccm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ccm.c:26: warning: Function parameter or member 'key_len' not described in 'ccm_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ccm.c:26: warning: expecting prototype for Nest Accelerators driver(). Prototype was for ccm_aes_nx_set_key() instead
 drivers/crypto/nx/nx-aes-ctr.c:25: warning: Function parameter or member 'tfm' not described in 'ctr_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ctr.c:25: warning: Function parameter or member 'in_key' not described in 'ctr_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ctr.c:25: warning: Function parameter or member 'key_len' not described in 'ctr_aes_nx_set_key'
 drivers/crypto/nx/nx-aes-ctr.c:25: warning: expecting prototype for Nest Accelerators driver(). Prototype was for ctr_aes_nx_set_key() instead
 drivers/crypto/nx/nx-aes-xcbc.c:22: warning: cannot understand function prototype: 'struct xcbc_state '
 drivers/crypto/nx/nx-sha256.c:21: warning: Function parameter or member 'tfm' not described in 'nx_crypto_ctx_sha256_init'
 drivers/crypto/nx/nx-sha256.c:21: warning: expecting prototype for SHA(). Prototype was for nx_crypto_ctx_sha256_init() instead
 drivers/crypto/nx/nx-sha512.c:20: warning: Function parameter or member 'tfm' not described in 'nx_crypto_ctx_sha512_init'
 drivers/crypto/nx/nx-sha512.c:20: warning: expecting prototype for SHA(). Prototype was for nx_crypto_ctx_sha512_init() instead
 drivers/crypto/nx/nx-842-pseries.c:280: warning: Function parameter or member 'wmem' not described in 'nx842_pseries_compress'
 drivers/crypto/nx/nx-842-pseries.c:280: warning: Excess function parameter 'wrkmem' description in 'nx842_pseries_compress'
 drivers/crypto/nx/nx-842-pseries.c:410: warning: Function parameter or member 'wmem' not described in 'nx842_pseries_decompress'
 drivers/crypto/nx/nx-842-pseries.c:410: warning: Excess function parameter 'wrkmem' description in 'nx842_pseries_decompress'
 drivers/crypto/nx/nx-842-pseries.c:523: warning: Function parameter or member 'devdata' not described in 'nx842_OF_set_defaults'
 drivers/crypto/nx/nx-842-pseries.c:548: warning: Function parameter or member 'prop' not described in 'nx842_OF_upd_status'
 drivers/crypto/nx/nx-842-pseries.c:582: warning: Function parameter or member 'devdata' not described in 'nx842_OF_upd_maxsglen'
 drivers/crypto/nx/nx-842-pseries.c:582: warning: Function parameter or member 'prop' not described in 'nx842_OF_upd_maxsglen'
 drivers/crypto/nx/nx-842-pseries.c:630: warning: Function parameter or member 'devdata' not described in 'nx842_OF_upd_maxsyncop'
 drivers/crypto/nx/nx-842-pseries.c:630: warning: Function parameter or member 'prop' not described in 'nx842_OF_upd_maxsyncop'
 drivers/crypto/nx/nx-842-pseries.c:692: warning: Cannot understand  *
 drivers/crypto/nx/nx-842-pseries.c:825: warning: Function parameter or member 'data' not described in 'nx842_OF_notifier'
 drivers/crypto/nx/nx-842-pseries.c:825: warning: Excess function parameter 'update' description in 'nx842_OF_notifier'

Cc: Haren Myneni <haren@us.ibm.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: linux-crypto@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fixes the following W=1 kernel build warning(s):

 drivers/crypto/cavium/nitrox/nitrox_main.c:41: warning: cannot understand function prototype: 'const struct pci_device_id nitrox_pci_tbl[] = '
 drivers/crypto/cavium/nitrox/nitrox_main.c:73: warning: Function parameter or member 'ndev' not described in 'write_to_ucd_unit'
 drivers/crypto/cavium/nitrox/nitrox_main.c:73: warning: Function parameter or member 'ucode_size' not described in 'write_to_ucd_unit'
 drivers/crypto/cavium/nitrox/nitrox_main.c:73: warning: Function parameter or member 'ucode_data' not described in 'write_to_ucd_unit'
 drivers/crypto/cavium/nitrox/nitrox_main.c:73: warning: Function parameter or member 'block_num' not described in 'write_to_ucd_unit'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:46: warning: Function parameter or member 'index' not described in 'incr_index'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:46: warning: Function parameter or member 'count' not described in 'incr_index'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:46: warning: Function parameter or member 'max' not described in 'incr_index'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:46: warning: expecting prototype for Response codes from SE microcode(). Prototype was for incr_index() instead
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:287: warning: Function parameter or member 'cmdq' not described in 'post_se_instr'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:381: warning: Function parameter or member 'callback' not described in 'nitrox_process_se_request'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:381: warning: Function parameter or member 'cb_arg' not described in 'nitrox_process_se_request'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:381: warning: expecting prototype for nitrox_se_request(). Prototype was for nitrox_process_se_request() instead
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:535: warning: Function parameter or member 'cmdq' not described in 'process_response_list'
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:535: warning: expecting prototype for process_request_list(). Prototype was for process_response_list() instead
 drivers/crypto/cavium/nitrox/nitrox_reqmgr.c:584: warning: Function parameter or member 'data' not described in 'pkt_slc_resp_tasklet'
 drivers/crypto/cavium/nitrox/nitrox_mbx.c:14: warning: cannot understand function prototype: 'enum mbx_msg_type '
 drivers/crypto/cavium/nitrox/nitrox_mbx.c:24: warning: cannot understand function prototype: 'enum mbx_msg_opcode '
 drivers/crypto/cavium/nitrox/nitrox_skcipher.c:26: warning: cannot understand function prototype: 'const struct nitrox_cipher flexi_cipher_table[] = '
 drivers/crypto/cavium/cpt/cptpf_main.c:411: warning: Function parameter or member 'cpt' not described in 'cpt_unload_microcode'
 drivers/crypto/cavium/cpt/cptpf_main.c:411: warning: expecting prototype for Ensure all cores are disengaged from all groups by(). Prototype was for cpt_unload_microcode() instead
 drivers/crypto/cavium/cpt/cptvf_reqmanager.c:17: warning: Function parameter or member 'q' not described in 'get_free_pending_entry'
 drivers/crypto/cavium/cpt/cptvf_reqmanager.c:17: warning: Function parameter or member 'qlen' not described in 'get_free_pending_entry'

Cc: George Cherian <gcherian@marvell.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

'err' will be assigned later and cleanup the redundant initialization.

Cc: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fix to return negative error code from the error handling
cases instead of 0.

Fixes: 9363efb4 ("crypto: qce - Add support for AEAD algorithms")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

There are a few leading spaces before tabs and remove it by running the
following commard:

	$ find . -name '*.c' | xargs sed -r -i 's/^[ ]+\t/\t/'

At the same time, fix two warning by running checkpatch.pl:
	WARNING: suspect code indent for conditional statements (16, 16)
	WARNING: braces {} are not necessary for single statement blocks
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Fix some spelling mistakes in comments:
cipherntext ==> ciphertext
syncronise ==> synchronise
feeded ==> fed
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Remove leading spaces before tabs in Kconfig file(s) by running the
following command:

  $ find drivers/char/hw_random -name 'Kconfig*' | x\
    args sed -r -i 's/^[ ]+\t/\t/'
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Remove the unused macro ICP_DH895XCC_PESRAM_BAR_SIZE in the firmware
loader.

This is to fix the following warning when compiling the driver using the
clang compiler with CC=clang W=2:

    drivers/crypto/qat/qat_common/qat_uclo.c:345:9: warning: macro is not used [-Wunused-macros]
Signed-off-by: Jack Xu <jack.xu@intel.com>
Co-developed-by: Zhehui Xiang <zhehui.xiang@intel.com>
Signed-off-by: Zhehui Xiang <zhehui.xiang@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Check the return code of the function qat_hal_rd_rel_reg() and return it
to the caller.

This is to fix the following warning when compiling the driver with
clang scan-build:

    drivers/crypto/qat/qat_common/qat_hal.c:1436:2: warning: 6th function call argument is an uninitialized value
Signed-off-by: Jack Xu <jack.xu@intel.com>
Co-developed-by: Zhehui Xiang <zhehui.xiang@intel.com>
Signed-off-by: Zhehui Xiang <zhehui.xiang@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Change the return status to error if MMP file size is too large so the
driver load fails early if a large MMP firmware is loaded.
Signed-off-by: Jack Xu <jack.xu@intel.com>
Co-developed-by: Zhehui Xiang <zhehui.xiang@intel.com>
Signed-off-by: Zhehui Xiang <zhehui.xiang@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Change "sram_visible" to "mmp_sram_size" and compare it with the MMP
size to prevent an overly large MMP file being written to SRAM.
Signed-off-by: Jack Xu <jack.xu@intel.com>
Co-developed-by: Zhehui Xiang <zhehui.xiang@intel.com>
Signed-off-by: Zhehui Xiang <zhehui.xiang@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Save the return value of qat_uclo_map_auth_fw() function so that the
function qat_uclo_wr_mimage() could return the correct value.
This way, the procedure of adf_gen2_ae_fw_load() function could stop
and exit properly by checking the return value of qat_uclo_wr_mimage().
Signed-off-by: Jack Xu <jack.xu@intel.com>
Co-developed-by: Zhehui Xiang <zhehui.xiang@intel.com>
Signed-off-by: Zhehui Xiang <zhehui.xiang@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

If an error occurs after calling 'sp_get_irqs()', 'sp_free_irqs()' must be
called as already done in the error handling path.

Fixes: f4d18d65 ("crypto: ccp - Abstract interrupt registeration")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: John Allen <john.allen@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Kunpeng930 could be able to close master ooo when NFE occurs, which will
disable memory accessing from device and execute tasks. This ensures that
errors do not spread.

This patch enables the hardware to close master ooo when an error occurs
by writing hardware registers, and ensures that the driver will not drain
qp because the hardware will empty the tasks automatically.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

In order to avoid reporting an exception but the error type is not
configured, the driver needs to configure the error type first, and then
enable the error interrupt. Before executing the task, hardware error
initialization is needed so that the hardware can detect the error in time.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Before device reset, the driver sets 'QM_RESETTING' flag, but after reset,
the wrong flag is cleared. This patch modifies the problem of inconsistent
flags.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The device needs to be initialized first, and then restart the queue to
execute tasks after PF reset.
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The sa_ul_probe creates child devices using of_platform_populate(),
but these are not cleaned up in driver remove. Clean these up
by removing the child devices using of_platform_depopulate().
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Simplify the platform_get_resource() and devm_ioremap_resource()
calls with devm_platform_ioremap_resource(). Also add error checking
and move up this block to simplify the cleanup in sa_ul_probe().
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Simplify the probe function by using the of_device_get_match_data()
helper instead of open coding. The logic is also moved up to fix the
missing pm_runtime cleanup in case of a match failure.

Fixes: 0bc42311 ("crypto: sa2ul - Add support for AM64")
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The pm_runtime APIs added first in commit 7694b6ca ("crypto: sa2ul -
Add crypto driver") are not unwound properly and was fixed up partially
in commit 13343bad ("crypto: sa2ul - Fix PM reference leak in
sa_ul_probe()"). This fixed up the pm_runtime usage count but not the
state. Fix this properly.

Fixes: 13343bad ("crypto: sa2ul - Fix PM reference leak in sa_ul_probe()")
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The sa_dma_init() function doesn't release the requested dma channels
on all failure paths. Any failure in this function also ends up
leaking the dma pool created in sa_init_mem() in the sa_ul_probe()
function. Fix all of these issues.

Fixes: 7694b6ca ("crypto: sa2ul - Add crypto driver")
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

The TI K3 family of SoCs have a SA2UL IP that contains a
SafeXcel IP-76 RNG block which is supported by the OMAP
RNG driver. Allow this driver to be built for TI K3
family as well.
Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Return error immediately if it goto 'default' path.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Delete rudundant macro definition.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Use 'GENMASK' to generate mask value, just make the code clearer.
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>