[PATCH v7 0/2] staging: rtl8723bs: Fix error handling in _rtw_pktfile_read()

[Minu Jin <s9430939@naver.com>]

This series improves error handling in _rtw_pktfile_read() and cleans up
the code style to comply with kernel standards.

1. The first patch combines the logic change and caller updates.
   The function change and the caller updates must be in the same
   patch. If they are separated, the code will not work correctly 
   or will cause errors at that specific point in the history.

2. The second patch focuses purely on code style cleanup (changing uint
   to unsigned int) as requested by Andy Shevchenko.

Regarding the logic change in _rtw_pktfile_read():

    The original code used a ternary operator to read whatever data was 
    available, even if it was less than requested. This could lead to 
    callers processing incomplete data without knowing it.

    I have changed this to return -EINVAL when the remaining data is insufficient. 
    This is safer because most callers expect the exact amount of data and 
    should not proceed with a partial read.

Testing and Verification:

    I do not have access to the physical RTL8723BS hardware. However, I have
    performed a rigorous manual audit of the data path and verified the
    changes using Smatch static analysis. The analysis confirmed that no
    new warnings or logical regressions were introduced in the modified files.

Changes in v7:
    - Added full cumulative changelog from v2 to v7 as requested by Greg KH.
    - Added note regarding hardware testing and Smatch verification results.

Changes in v6:
   - Reorganized into a 2-patch series to maintain git bisect safety
     (addressed Dan Carpenter's feedback).
   - Combined function logic changes with caller updates into Patch 1.
   - Separated style cleanup (uint -> unsigned int) into Patch 2.

Changes in v5:
   - Split the patch into a 3-patch series (suggested by Greg KH).
   - Patch 1: Refactored return type to 'int'.
   - Patch 2: Added error checks to call sites.
   - Patch 3: Implemented -EINVAL logic.
   (Note: Superseded by v6 to fix git bisect issues).

Changes in v4:
   - Modified _rtw_pktfile_read() to return -EINVAL if data is
     insufficient (following Greg KH's hint).
   - Replaced 'uint' with 'unsigned int' (suggested by Andy Shevchenko).
   - Removed redundant local variable 'len'.

Changes in v3:
   - Updated set_qos() from void to int (suggested by Greg KH, Dan Carpenter).
   - Fixed coding style issues (suggested by Andy Shevchenko).

Changes in v2:
   - Added check for skb_copy_bits() return value.

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2.43.0