On 03/10/2016 05:15 PM, mrpace2@xxxxxxxxx wrote:
The NBANK macro can be extended in order to avoid the underflow:
#define NBANK(chip) (chip->gpio_chip.ngpio == 0 ? 0 : \
((chip->gpio_chip.ngpio + (BANK_SZ - 1)) / BANK_SZ))
Resending a modified patch.
Signed-off-by: Frank Edelhaeuser <mrpace2 <at> gmail.com>
---
diff -Nur a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
--- a/drivers/gpio/gpio-pca953x.c 2016-03-10 02:34:56.012345678 +0000
+++ b/drivers/gpio/gpio-pca953x.c 2016-03-10 02:34:56.012345678 +0000
@@ -86,7 +86,8 @@
#define MAX_BANK 5
#define BANK_SZ 8
-#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
+#define NBANK(chip) (chip->gpio_chip.ngpio == 0 ? 0 : \
+ ((chip->gpio_chip.ngpio + (BANK_SZ - 1)) / BANK_SZ))
And finally this DIV_ROUND_UP:) Right?
--
regards,
-grygorii
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