Re: [PATCH -next v3] scsi: sd: Fix an incorrect type in 'sd_spinup_disk()'

[Bart Van Assche <bvanassche@acm.org>]

On 7/9/24 2:39 AM, Jiapeng Chong wrote:
> The return value from the call to scsi_execute_cmd() is int. In the
              ^^^^^
               type

> 'else if' branch of the function scsi_execute_cmd, it will return -EINVAL.
> But the type of "the_result" is "unsigned int", causing the error code to
> reverse. Modify the type of "the_result" to solve this problem.
   ^^^^^^^

What is "reversing an error code"? Did you perhaps mean that the return
value is changed from a negative integer to a positive integer?

> ./drivers/scsi/sd.c:2333:6-16: WARNING: Unsigned expression compared
> with zero: the_result > 0.

Doesn't this patch fix reading uninitialized data? If so, shouldn't that
be mentioned in the patch description?

> Fixes: c1acf38cd11e ("scsi: sd: Have midlayer retry sd_spinup_disk() errors")

Hmm ... that seems incorrect to me. Commit c1acf38cd11e changed the
indentation of "the_result > 0" expressions but did not introduce these.
Is this perhaps the commit that introduced the "the_result > 0"
expressions: ced202f7bd78 ("scsi: core: Stop using DRIVER_ERROR")?

Thanks,

Bart.