On 22.02.2018 11:23, Claudiu Beznea wrote:
> Hi Dan,
Sorry, I intended to be address this to Ajay,
>
> On 22.02.2018 09:37, Dan Carpenter wrote:
>> On Wed, Feb 21, 2018 at 09:42:10PM +0530, Ajay Singh wrote:
>>> Use existing macro GENMASK to get the bitmask value. Moved the code to
>>> get the bitmask value outside the loop, as its only required one time.
>>>
>>> Signed-off-by: Ajay Singh <ajay.kathat@xxxxxxxxxxxxx>
>>> ---
>>> drivers/staging/wilc1000/wilc_spi.c | 3 +--
>>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/staging/wilc1000/wilc_spi.c b/drivers/staging/wilc1000/wilc_spi.c
>>> index 131d2b7..c63f534 100644
>>> --- a/drivers/staging/wilc1000/wilc_spi.c
>>> +++ b/drivers/staging/wilc1000/wilc_spi.c
>>> @@ -955,6 +955,7 @@ static int wilc_spi_read_int(struct wilc *wilc, u32 *int_status)
>>> tmp = (byte_cnt >> 2) & IRQ_DMA_WD_CNT_MASK;
>>>
>>> j = 0;
>>> + unknown_mask = GENMASK(g_spi.nint - 1, 0);
>>> do {
>>> wilc_spi_read_reg(wilc, 0x1a90, &irq_flags);
>>> tmp |= ((irq_flags >> 27) << IRG_FLAGS_OFFSET);
>>> @@ -964,8 +965,6 @@ static int wilc_spi_read_int(struct wilc *wilc, u32 *int_status)
>>> tmp |= (((irq_flags >> 0) & 0x7) << k);
>>> }
>>>
>>> - unknown_mask = ~((1ul << g_spi.nint) - 1);
>>> -
>>
>> This isn't right at all... Say g_spi.nint is zero, then we're doing
>> GENMASK(-1, 0) which seems like it should be undefined. If g_spi.nint
>> is 1 then "GENMASK(1 - 1, 0)" is 0x1 but "~((1 < 1) - 1)" is ~0x1.
>>
>
> Even in this driver g_spi.nint is always constant and equal with NUM_INT_EXT
> (which is 3), it seems that enabling interrupts before initializing g_spi.nint
> may lead to the state where g_spi.nint = 0, as Dan pointed.
>
> int wilc1000_wlan_init(struct net_device *dev, struct wilc_vif *vif)
> {
> // ...
> if (wl->gpio >= 0 && init_irq(dev)) {
> ret = -EIO;
> goto _fail_locks_;
> }
>
> // ...
> ret = linux_wlan_start_firmware(dev); -> calls
> linux_wlan_start_firmware which in turn calls wilc->hif_func->hif_sync_ext(wilc,
> NUM_INT_EXT);
>
>
> }
>
> Thank you,
> Claudiu Beznea
>
>> I'm done reviewing this patch series... You need to be more careful.
>> Create a small test program to test your patches. As a reviewer,
>> creating test programs is how I review your patches.
>>
>> #include <sys/types.h>
>> #include <sys/stat.h>
>> #include <fcntl.h>
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <limits.h>
>> #include <string.h>
>> #include "/home/dcarpenter/progs/smatch/devel/check_debug.h"
>> #include "kernel.h"
>> #include <assert.h>
>> #include <fcntl.h>
>> #include <sys/time.h>
>> #include <sys/ioctl.h>
>> #include <linux/blktrace_api.h>
>> #include <linux/fs.h>
>>
>> #define BITS_PER_LONG 64
>> #define GENMASK(h, l) \
>> (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
>>
>> int main(void)
>> {
>> int i;
>> u32 mask1, mask2;
>>
>> for (i = 0; i < 32; i++) {
>> mask1 = ~((1ul << i) - 1);
>> mask2 = GENMASK(i - 1, 0);
>> if (mask1 == mask2)
>> continue;
>> printf("ONE 0x%x %d\n", mask1, i);
>> printf("TWO 0x%x\n", mask2);
>> }
>> return 0;
>> }
>>
>> regards,
>> dan carpenter
>>
>>
>>
>> _______________________________________________
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>> devel@xxxxxxxxxxxxxxxxxxxxxx
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>>
>
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