Re: [Qemu-devel] [PATCH] pflash: Avoid warnings from coverity

[Stefan Weil <sw@weilnetz.de>]

Am 19.09.2012 18:45, schrieb Peter Maydell:
> On 19 September 2012 17:41, Stefan Weil <sw@weilnetz.de> wrote:
>> hw/pflash_cfi01.c:209:
>> check_return: Calling function "bdrv_write" without checking return value (as is done elsewhere 35 out of 37 times).
>>
>> hw/pflash_cfi02.c:144:
>> unterminated_default: The default case is not terminated by a 'break' statement.
>>
>> hw/pflash_cfi02.c:238:
>> check_return: Calling function "bdrv_write" without checking return value (as is done elsewhere 35 out of 37 times).
>>
>> Signed-off-by: Stefan Weil <sw@weilnetz.de>
>> ---
>>   hw/pflash_cfi01.c |    6 ++++--
>>   hw/pflash_cfi02.c |    7 +++++--
>>   2 files changed, 9 insertions(+), 4 deletions(-)
>>
>> diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c
>> index 56ed33f..27ae4aa 100644
>> --- a/hw/pflash_cfi01.c
>> +++ b/hw/pflash_cfi01.c
>> @@ -205,8 +205,10 @@ static void pflash_update(pflash_t *pfl, int offset,
>>           /* round to sectors */
>>           offset = offset >> 9;
>>           offset_end = (offset_end + 511) >> 9;
>> -        bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
>> -                   offset_end - offset);
>> +        if (bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
>> +                       offset_end - offset) == -1) {
>> +            fprintf(stderr, "pflash: Error writing to flash storage\n");
>> +        }
> ...shouldn't we be propagating the write error up to the guest?
> It feels like this change is just silencing the coverity error
> without actually fixing the underlying problem.
>
> -- PMM

As far as I know, there is no concept how a flash memory
can report a write error. Flash memory which cannot be
written is unusable.

hw/nand.c uses a similar handling for write errors,
but writes the error message to stdout (no good idea).

- Stefan