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gnss: serial: fix synchronous write timeout

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commit 56a6c7268312cba9436b84cac01b3e502c5c511d upstream.

Passing a timeout of zero to the synchronous serdev_device_write()
helper does currently not imply to wait forever (unlike passing zero to
serdev_device_wait_until_sent()). Instead, if there's insufficient
room in the write buffer, we'd end up with an incomplete write.

Fixes: 37768b054f ("gnss: add generic serial driver")
Cc: stable <stable@vger.kernel.org>     # 4.19
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2018-11-14 09:33:57 +01:00 • committed by Greg Kroah-Hartman
commit 9cdfd2233a
1 changed files with 2 additions and 1 deletions
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3
drivers/gnss/serial.c
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@ -13,6 +13,7 @@
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/sched.h>
#include <linux/serdev.h>
#include <linux/slab.h>
@ -63,7 +64,7 @@ static int gnss_serial_write_raw(struct gnss_device *gdev,
int ret;
/* write is only buffered synchronously */
ret = serdev_device_write(serdev, buf, count, 0);
ret = serdev_device_write(serdev, buf, count, MAX_SCHEDULE_TIMEOUT);
if (ret < 0)
return ret;