From: Eric Biggers <ebiggers@kernel.org>
To: Bart Van Assche <bvanassche@acm.org>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>,
Jaegeuk Kim <jaegeuk@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
linux-scsi@vger.kernel.org, Bean Huo <beanhuo@micron.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
Avri Altman <avri.altman@wdc.com>,
Daejun Park <daejun7.park@samsung.com>
Subject: Re: [PATCH v2 07/29] scsi: ufs: Use get_unaligned_be16() instead of be16_to_cpup()
Date: Tue, 12 Apr 2022 14:26:46 -0700 [thread overview]
Message-ID: <YlXuliEBsVH0VPaP@sol.localdomain> (raw)
In-Reply-To: <20220412181853.3715080-8-bvanassche@acm.org>
On Tue, Apr 12, 2022 at 11:18:31AM -0700, Bart Van Assche wrote:
> Use get_unaligned_be16(...) instead of the equivalent but harder to read
> be16_to_cpup((__be16 *)...).
>
> Reviewed-by: Bean Huo <beanhuo@micron.com>
> Signed-off-by: Bart Van Assche <bvanassche@acm.org>
> ---
> drivers/scsi/ufs/ufshcd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index d4ef31e1a409..3ec26c9eb1be 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7334,7 +7334,7 @@ static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan, char *buff)
> u16 unit;
>
> for (i = start_scan; i >= 0; i--) {
> - data = be16_to_cpup((__be16 *)&buff[2 * i]);
> + data = get_unaligned_be16(&buff[2 * i]);
This is not "equivalent". get_unaligned_be16() works on unaligned values
whereas be16_to_cpup() assumes a naturally aligned value. This patch might
still be the right thing to do, but the explanation is not correct.
- Eric
next prev parent reply other threads:[~2022-04-12 23:35 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-12 18:18 [PATCH v2 00/29] UFS patches for kernel v5.19 Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 01/29] scsi: ufs: Fix a spelling error in a source code comment Bart Van Assche
2022-04-13 5:18 ` Avri Altman
2022-04-12 18:18 ` [PATCH v2 02/29] scsi: ufs: Declare ufshcd_wait_for_register() static Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 03/29] scsi: ufs: Remove superfluous boolean conversions Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 04/29] scsi: ufs: Simplify statements that return a boolean Bart Van Assche
2022-04-13 2:33 ` Keoseong Park
2022-04-13 3:20 ` Bart Van Assche
2022-04-13 5:18 ` Keoseong Park
2022-04-12 18:18 ` [PATCH v2 05/29] scsi: ufs: Remove ufshcd_lrb.sense_bufflen Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 06/29] scsi: ufs: Remove ufshcd_lrb.sense_buffer Bart Van Assche
2022-04-13 5:23 ` Avri Altman
2022-04-12 18:18 ` [PATCH v2 07/29] scsi: ufs: Use get_unaligned_be16() instead of be16_to_cpup() Bart Van Assche
2022-04-12 21:26 ` Eric Biggers [this message]
2022-04-13 0:08 ` Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 08/29] scsi: ufs: Remove the UFS_FIX() and END_FIX() macros Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 09/29] scsi: ufs: Rename struct ufs_dev_fix into ufs_dev_quirk Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 10/29] scsi: ufs: Declare the quirks array const Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 11/29] scsi: ufs: Invert the return value of ufshcd_is_hba_active() Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 12/29] scsi: ufs: Remove unused constants and code Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 13/29] scsi: ufs: Switch to aggregate initialization Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 14/29] scsi: ufs: Make the config_scaling_param calls type safe Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 15/29] scsi: ufs: Remove the driver version Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 16/29] scsi: ufs: Rename sdev_ufs_device into ufs_device_wlun Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 17/29] scsi: ufs: Use an SPDX license identifier in the Kconfig file Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 18/29] scsi: ufs: Remove paths from source code comments Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 19/29] scsi: ufs: Remove the TRUE and FALSE definitions Bart Van Assche
2022-04-14 11:56 ` Avri Altman
2022-04-12 18:18 ` [PATCH v2 20/29] scsi: ufs: Remove locking from around single register writes Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 21/29] scsi: ufs: Introduce ufshcd_clkgate_delay_set() Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 22/29] scsi: ufs: qcom: Fix ufs_qcom_resume() Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 23/29] scsi: ufs: Remove unnecessary ufshcd-crypto.h include directives Bart Van Assche
2022-04-12 21:30 ` Eric Biggers
2022-04-12 18:18 ` [PATCH v2 24/29] scsi: ufs: Fix kernel-doc syntax in ufshcd.h Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 25/29] scsi: ufs: Minimize #include directives Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 26/29] scsi: ufs: Split the ufshcd.h header file Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 27/29] scsi: ufs: Move the struct ufs_ref_clk definition Bart Van Assche
2022-04-12 18:18 ` [PATCH v2 28/29] scsi: ufs: Move the ufs_is_valid_unit_desc_lun() definition Bart Van Assche
2022-04-19 21:00 ` Bean Huo
2022-04-19 21:48 ` Bart Van Assche
2022-04-12 18:32 ` [PATCH v2 29/29] scsi: ufs: Split the drivers/scsi/ufs directory Bart Van Assche
2022-04-18 17:11 ` Bart Van Assche
2022-04-19 8:25 ` Bean Huo
2022-04-19 20:28 ` Bart Van Assche
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