linux-kernel - Re: [PATCHv2] Check whether divisor is non-zero before division

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Date: Sat, 25 May 2024 12:35:07 +0800
From: shichao lai <shichaorai@...il.com>
To: Alan Stern <stern@...land.harvard.edu>, gregkh@...uxfoundation.org, oneukum@...e.com
Cc: linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net, 
	linux-kernel@...r.kernel.org, xingwei lee <xrivendell7@...il.com>, 
	yue sun <samsun1006219@...il.com>
Subject: Re: [PATCHv2] Check whether divisor is non-zero before division

On Sat, May 25, 2024 at 10:24 AM Alan Stern <stern@...land.harvard.edu> wrote:
> If alauda_init_media() returns an error, leave info->initialized
> unchanged.  alauda_check_media() will return an error also, so the bad
> division won't take place.
>
> Alan Stern

Thanks! You also remind me that the return value from
alauda_init_media() is never used!
By this way, the workflow now seems to work correctly.
It tries to initialize multiple times, and finally disconnects due to
no response.

Now if possible, I will post a [PATCH v4] for this bug soon.
I want to know whether it is possible to add some tags like
Suggested-by or Reviewed-by for Dear Alan Stern, gregkh
and oneukum as thanks for your discussions.

e.g.
==== kernel log
[   47.266129][ T4125] alauda_check_media: before init_media,
status[0]: 0000000000000036
[   47.266555][ T4125] alauda_check_media: enter init_media
[   47.467314][    T9] usb 1-1: USB disconnect, device number 2
root@...kaller:~# [   47.485304][ T4125] alauda_get_media_status: data=54, rc=4
[   47.485640][ T4125] alauda_init_media: exit in 391
[   47.486104][   T41] sd 2:0:0:0: [sdb] Read Capacity(10) failed:
Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[   47.486591][   T41] sd 2:0:0:0: [sdb] Sense not available.
[   47.486889][   T41] sd 2:0:0:0: [sdb] 0 512-byte logical blocks: (0 B/0 B)
[   47.487212][   T41] sd 2:0:0:0: [sdb] 0-byte physical blocks
[   47.487515][   T41] sd 2:0:0:0: [sdb] Write Protect is off
[   47.487813][   T41] sd 2:0:0:0: [sdb] Asking for cache data failed
[   47.488104][   T41] sd 2:0:0:0: [sdb] Assuming drive cache: write through
[   47.491396][   T41] sd 2:0:0:0: [sdb] Attached SCSI removable disk
[   48.105309][ T1198] not responding...