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authorMariusz Bialonczyk <manio@skyboo.net>2019-05-30 10:51:25 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-06 17:15:21 +0300
commitaacd152ecd7b18af5d2d96dea9e7284c1c93abea (patch)
tree8f9cddd2386e64458cc32367c218f4baa1cc014f /drivers/w1
parent7e706da35a458f4b0d4c565c7b71023d8bfe279b (diff)
downloadlinux-aacd152ecd7b18af5d2d96dea9e7284c1c93abea.tar.xz
w1: ds2413: fix state byte comparision
This commit is fixing a smatch warning: drivers/w1/slaves/w1_ds2413.c:61 state_read() warn: impossible condition '(*buf == 255) => ((-128)-127 == 255)' by creating additional u8 variable for the bus reading and comparision Reported-by: kbuild test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 3856032a0628 ("w1: ds2413: when the slave is not responding during read, select it again") Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/slaves/w1_ds2413.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c
index 21f08ac8a4e0..3364ad276b15 100644
--- a/drivers/w1/slaves/w1_ds2413.c
+++ b/drivers/w1/slaves/w1_ds2413.c
@@ -33,6 +33,7 @@ static ssize_t state_read(struct file *filp, struct kobject *kobj,
struct w1_slave *sl = kobj_to_w1_slave(kobj);
unsigned int retries = W1_F3A_RETRIES;
ssize_t bytes_read = -EIO;
+ u8 state;
dev_dbg(&sl->dev,
"Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
@@ -53,12 +54,13 @@ next:
while (retries--) {
w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ);
- *buf = w1_read_8(sl->master);
- if ((*buf & 0x0F) == ((~*buf >> 4) & 0x0F)) {
+ state = w1_read_8(sl->master);
+ if ((state & 0x0F) == ((~state >> 4) & 0x0F)) {
/* complement is correct */
+ *buf = state;
bytes_read = 1;
goto out;
- } else if (*buf == W1_F3A_INVALID_PIO_STATE) {
+ } else if (state == W1_F3A_INVALID_PIO_STATE) {
/* slave didn't respond, try to select it again */
dev_warn(&sl->dev, "slave device did not respond to PIO_ACCESS_READ, " \
"reselecting, retries left: %d\n", retries);