• Łukasz Majewski's avatar
    FIX: fat: Provide correct return code from disk_{read|write} to upper layers · 0a04ed86
    Łukasz Majewski authored
    
    
    It is very common that FAT code is using following pattern:
    if (disk_{read|write}() < 0)
            return -1;
    
    Up till now the above code was dead, since disk_{read|write) could only
    return value >= 0.
    As a result some errors from medium layer (i.e. eMMC/SD) were not caught.
    
    The above behavior was caused by block_{read|write|erase} declared at
    struct block_dev_desc (@part.h). It returns unsigned long, where 0
    indicates error and > 0 indicates that medium operation was correct.
    
    This patch as error regards 0 returned from block_{read|write|erase}
    when nr_blocks is grater than zero. Read/Write operation with nr_blocks=0
    should return 0 and hence is not considered as an error.
    Signed-off-by: default avatarLukasz Majewski <l.majewski@samsung.com>
    
    Test HW: Odroid XU3 - Exynos 5433
    0a04ed86
fat_write.c 25.7 KB